If two tablets are dissolved in water to give two ounces (1 16quart) of solution, estimate the pH. How do we do that? a). A: Mean life time of a reaction is defined by average life time of all species in a 1st order reaction. The French physicist Jean Baptiste coined the term 'Avogadro's number'. Express your answer as a chemical formula. Molarmass(g / mol) = Mass(g) Mole(mol) In this formula, molar mass is represented in units of g/mol. If a more accurate value of the molar mass is required, it is necessary to determine the isotopic distribution of the sample in question, which may be different from the standard distribution used to calculate the standard atomic mass. Calculate the number of nitrogen atoms in this 0.2480-g sample. The unit representing the molar mass is g/mol. C6H7N, 372.53 g/mol C2HCl, 241.92 g/mol C5H10NS2, 296.56 g/mol From the given empirical formula and molar mass, find the molecular formula of each compound. This same approach may be taken considering a pair of molecules, a dozen molecules, or a mole of molecules, etc. The atomic masses can be found in the periodic table. How will the pH of this solution compare to that of the solution that contained only NaX? Part B 186.24 g/mol, C6H7N Express your answer as a chemical formula. For chemical elements without isolated molecules, such as carbon and metals, the molar mass is computed dividing by the number of moles of atoms instead. since the two isotopes have a different atomic mass due to additional neutrons). Consider a sample of compound determined to contain 1.71 g C and 0.287 g H. The corresponding numbers of atoms (in moles) are: Thus, this compound may be represented by the formula C0.142H0.284. Symbol: H What Is Relative Atomic Mass / Relative Molecular Mass / Average Molecular Weight? Nissa has a masters degree in chemistry and has taught high school science and college level chemistry. This is more accurate than is usually required, but avoids rounding errors during calculations. Make sure to use capital letters where appropriatel. [7] This is a dimensionless quantity (i.e., a pure number, without units) equal to the molar mass divided by the molar mass constant.[8]. For example, some common compounds include salt, glucose, acetic acid (or vinegar), and sodium bicarbonate (or baking soda). The number of grams is equal to the molar mass of the element or compound multiplied by the number of moles. In other words, the molar mass works as a bridge between the mole and the mass. = = () = = () = = () = = () For these sorts of applications, the percent composition of a compound is easily derived from its formula mass and the atomic masses of its constituent elements. 48 kg of MoO3(s). When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. Percent Composition Formula & Examples | How to Find Percent Composition, Using Colligative Properties to Determine Molar Mass, Binary Molecular Compounds | Formulas, List & Prefixes. succeed. Learn the definition of molar mass and how it relates to the periodic table. To calculate the moles from molar mass, mass is required. percent yield calculator which can help you apply this to actual experiments. Start your trial now! l type='a'> 49.2 g of sulfur 7.44104 kg of lead 3.27 mg of chlorine 4.01 g of lithium l00.Ogofcopper 82.6 mg of strontium. Find the molecular formula of each compound. S We may be able to balance a chemical equation Ratio This is accomplished using molar masses to convert the mass of each element to a number of moles. A useful convention for normal laboratory work is to quote molar masses to two decimal places for all calculations. Take a standard chemistry formula for a molecule, split it up into the component atoms, and look up the molar weight of each atom. We also have a What is the pH of a 0.015 M aqueous solution of boric acid? Create your account. Suppose a person has one mole of water. If you have 0.865 g of the hydrated compound and obtain 0.679 g of UO2(NO3)2 on heating, how many waters of hydration are in each formula unit of the original compound? when barium chloride is mi A: Answer: Other terms: atomic mass of Aniline, molar mass of Aniline, molecular mass. Average Atomic Mass | Calculation & Formula, Real Gases vs. Compound. A common request on this site is to convert grams to moles. (Atomic masses: C = 12 amu, H = 1 amu, N = 14 amu). A 50.51 g sample of a compound made from phosphorus and chlorine is decomposed. Calculation of the relative molecular and molar mass of C6H7N. For a single sample, the relative atomic Determining the absolute numbers of atoms that compose a single molecule of a covalent compound requires knowledge of both its empirical formula and its molecular mass or molar mass. These represent the atomic mass. Arithmetic Sequence, 284.77 g/mol, CCl 437 lessons From the given empirical formula and molar mass, find the molecular formula of each compound. Use chemical reactions as part of your explanation; you do not need to solve for a numerical answer. If the actual molar mass of the compound is 186,24 g/mol, what is the molecular formula? Calculate the pH of a solution that is prepared by dissolving 924. mg of aniline in enough water to . Weighted Average Calculator, For example, if your answer is C2814 you would type in in C2Br4 Avogadro's number is 6.02 x 1023 atoms per mole or molecules per mole. What is the degree of ionization of boric acid in this solution? CaCO3sCaOs+ A: Mole can be defined as a standard unit for measuring large quantities of very small entities such as A: In the balance reaction atoms of each element is same on both sides. Percentage According to Avogadro's number, the person would have {eq}6.023 \times {10^{23}} {/eq} water molecules within that mole of water. Any chemical element. It is obtained by multiplying the empirical formula with number of empirical formula units in the compound. The nitrogen atom acts as the proton acceptor in a proton transfer reaction. She has an M.Sc. Geometric Sequence, Then, we add these two masses together to find the total mass of sodium chloride molecules. Arrhenius acid act as a good electrolyte as it dissociates to its respective ions in the aqueous solutions. Tool Overview: Molar Mass of Aniline (C6H7N) Solving for the atomic mass of Aniline (C6H7N) Need to know the atomic mass of a Aniline molecule? Molar mass is the mass of all the atoms of a molecule in grams per mole. Molar Mass, Molecular Weight and Elemental Composition Calculator Molar mass of C5h12s is 104.2138 g/mol Get control of 2022! Express your answer as a chemical formula. (C6H5)3PCCO => C18H15PCCO. opens up the URL, they will see your calculations. Chemistry High School answered expert verified A 6.55 g sample of aniline (C_ {6}H_ {5}NH_ {2}, molar mass = 93.13 g/mol) was combusted in a bomb calorimeter. Any chemical element. They don't affect the weight anyhow. Z Score Calculator. As the name suggests, an empirical formula mass is the sum of the average atomic masses of all the atoms represented in an empirical formula. In the International System of Units (SI), the coherent unit of molar mass is kg/mol. What would be the pH of 1.0 L of solution that contained 0.10 mol of AX? If so, compare the [OH] in the solution to the [H3O+]. To convert this into a whole number, multiply each of the subscripts by two, retaining the same atom ratio and yielding Cl2O7 as the final empirical formula. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. Molar mass can be measured by a number of experimental methods, many of which will be introduced in later chapters of this text. Need to know the atomic mass of a Aniline molecule? Check out a sample Q&A here See Solution star_border Convert between (C6H7N)2CdBr2 weight and moles. Bronsted Lowry Base In Inorganic Chemistry. Suppose you add 1.75 M NaOH to a container that completely reacts with 15.0 mL of 0.990 MH3PO4. Relative Number of atoms Molar mass is an important concept in adapting chemical formulas to real world conditions. Track your food intake, exercise, sleep and meditation for free. I feel like its a lifeline. as a precursor in the synthesis of urethane polymers. elements present (driven by differences in radioactive decay and how the material was aggregated to begin with). The molar mass is the mass of all the atoms in a molecule in grams per mole. For example, if the answer is Fe20713011 - you would enter itinas. To get the molar mass of a chemical compound, multiply the atomic mass with number of the atoms. Molecules, which make up substances, often need to be measured in experiments, and it is important that these measurements are accurate. Here, the units of mass are grams and the units of moles are mols, so the units of the molar mass will be g/mol. As previously mentioned, the most common approach to determining a compounds chemical formula is to first measure the masses of its constituent elements. | Empirical Formula Examples, Glencoe Chemistry - Matter And Change: Online Textbook Help, Glencoe Physical Science: Online Textbook Help, Holt McDougal Modern Chemistry: Online Textbook Help, Holt McDougal Physics: Online Textbook Help, WBJEEM (West Bengal Joint Entrance Exam): Test Prep & Syllabus, CSET Science Subtest II Life Sciences (217): Practice Test & Study Guide, SAT Subject Test Chemistry: Practice and Study Guide, SAT Subject Test Biology: Practice and Study Guide, UExcel Microbiology: Study Guide & Test Prep, High School Biology: Homework Help Resource, Create an account to start this course today. The molar masses and empirical formulas of several compounds containing carbon and nitrogen are as follows. Fibonacci Sequence What is Nickel? Given, The empirical formula for this compound is thus CH2. Creative Commons Attribution License Therefore, any experimentally derived data involving mass must be used to derive the corresponding numbers of atoms in the compound. A: Given information: Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al. Molar mass is calculated as a total of the atomic masses of all atoms that are present in a given compound. Browse the list of Uses the formula of a reactant to determine molar mass. Limiting Reactant Formula & Examples | What is a Limiting Reactant? From the given empirical formula and molar mass, find the molecular formula of each compound. The standard atomic weight takes into account the isotopic distribution of the element in a given sample (usually assumed to be "normal"). What was the volume of the H3PO4 that you used? The formula mass of ammonia is therefore (14.01 amu + 3.024 amu) = 17.03 amu, and its percent composition is: This same approach may be taken considering a pair of molecules, a dozen molecules, or a mole of molecules, etc. Combining these two equations gives an expression for the molar mass in terms of the vapour density for conditions of known pressure and temperature: The freezing point of a solution is lower than that of the pure solvent, and the freezing-point depression (T) is directly proportional to the amount concentration for dilute solutions. Determine the molecular formulas to which the following empirical formulas and molar masses pertain. process. According to the above dissociation, one mole of water gives protons and one mole of hydroxide ions. Hbr HBr Molar Mass HBr Bond Polarity HBr Oxidation Number. for the molecular do i take. Until 2019, the mole was defined as the amount of substance that has as many constituent particles as there are atoms in 12grams of carbon-12. The pH of this solution is found to be 13.00. (a) Calculate the amount (moles) of each substance in the tablet. When 0.10 mol of the ionic solid ACl, where A is an unknown cation, is dissolved in enough water to make 1.0 L of solution, the pH of the solution is 7.00. flashcard set. I would definitely recommend Study.com to my colleagues. 1. A: IR helps us To find The Unknown functional Group present in the Compounds. Finding molar mass starts with units of grams per mole (g/mol). In the science laboratory, we use a tool called an analytical balance to measure in grams. l type='a'> Determine the empirical formula of the compound. If you look at the entries for sodium and chlorine in the table, we will pay attention to the numbers that appear in the top left (see video). Assume that volumes are additive. As one example, consider the common nitrogen-containing fertilizers ammonia (NH3), ammonium nitrate (NH4NO3), and urea (CH4N2O). You can use our calculator to solve for empirical formula mass. The mass of two nitrogen atoms is {eq}{\rm{2}}\,{\rm{N}}\, \times \,{\rm{14}}{\rm{.01}}\,{\rm{g/mol}} = 28.02 {/eq}, The mass of six oxygen atoms is {eq}{\rm{6}}\,{\rm{O}} \times \,{\rm{16}}{\rm{.00}}\,{\rm{g/mol}} = 96 {/eq}, {eq}\begin{align*} {\rm{Molar \,\,mass \,\,of}}\;{\rm{Pb}}{\left( {{\rm{N}}{{\rm{O}}_{\rm{3}}}} \right)_{\rm{2}}} &= 207.2{\rm{ }} + {\rm{ }}28.02{\rm{ }} + {\rm{ }}96\\ & = 331.22{\rm{ g/mol}} \end{align*} {/eq}. Determine the number of moles = subscript So for the first one C has 6 moles H has 7 moles N has 1 mole 2. Step 1: The chemical formula of ethanol is {eq}{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{OH}} {/eq}. Part A 163.26 g/mol, C11H17N Express your answer as a chemical formula. Atomic Mass of S - 32.065 u Manaswi Arora has taught chemistry for over two years. A) C6H7N , 372.53 g/mol B) C2HCl , 120.95 g/mol C) C5H10NS2 , 593.12 g/mol Expert Solution Want to see the full answer? If we already know the number of moles needed, we can use the concept of molar mass to calculate how many grams of the substance are required. To calculate the molar mass of a molecule, we first obtain the atomic weights from the individual elements in a periodic table. The mole was defined in such a way that the molar mass of a compound, in g/mol, is numerically equal to the average mass of one molecule, in daltons. [1] The molar mass is a bulk, not molecular, property of a substance. This book uses the Mass-to-Mass Stoichiometry | Problems, Conversion & Calculation, Addition & Subtraction of Rational Exponents. The element chlorine has an atomic mass of 35.453 g/mol. - Formula, Production & Uses, What is Molar Mass? The pkp value for aniline at 25C is 9.37. Part A. C6H7N, 279.41 g/mol Express your answer as a chemical formula. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. Molar and molecular weight of C6H7N. Compound B, A: Given that, A compound having This is distinct but related to the molar mass, which is a measure of the average molecular mass of all the molecules in a sample and is usually the more appropriate measure when dealing with macroscopic (weigh-able) quantities of a substance. The mole concept can b. WebQC is a web application with a mission to provide best-in-class chemistry tools and information to chemists and students. The molar mass of ozone is 48 g/mol: (3)(16 g/mol) = 48 g/mol. When the composition is expressed as a molality, the proportionality constant is known as the cryoscopic constant (Kf) and is characteristic for each solvent. Mole formula is: Mole = Mass / Molar mass. Given the molar mass is 279.39 g/mol.Empirical formula is C6H7N.Empirical formula mass. Next, derive the iron-to-oxygen molar ratio by dividing by the lesser number of moles: The ratio is 1.000 mol of iron to 1.500 mol of oxygen (Fe1O1.5). and unpack brackets. She has experience of one year in academic content writing. [11], The term formula weight has a specific meaning when used in the context of DNA synthesis: whereas an individual phosphoramidite nucleobase to be added to a DNA polymer has protecting groups and has its molecular weight quoted including these groups, the amount of molecular weight that is ultimately added by this nucleobase to a DNA polymer is referred to as the nucleobase's formula weight (i.e., the molecular weight of this nucleobase within the DNA polymer, minus protecting groups). A calculator will also be useful. What is its molecular formula? Molar mass of C6H7N is 93.1265 g/mol Get control of 2022! The mole concept enables one to handle the large amount of small elementary particles. Next, we divide the molecular weight of the substance under study by the just found molecular weight of the empirical formula and obtain: 180.16 / 30.026 = 5.954. Step 2: Taken from the periodic table, the atomic mass of hydrogen is 1.008 g/mol. 32.066 The molar mass of atoms of an element is given by the relative atomic mass of the element multiplied by the molar mass constant, M u = 0.999 999 999 65 (30) 10 3 kgmol 1. See also our theoretical yield calculator for chemical reactions (probably your next stop to finish the problem set). An error occurred trying to load this video. For example, consider a gaseous compound composed solely of carbon and hydrogen. Vascular Cylinder Overview & Anatomy | What is the Vascular Cylinder? What is its empirical formula? Part C. C5H10NS2, 593.13 g/mol Express your answer as a chemical formula. What is the molecular formula of the compound? Thus, for example, the molar mass of iron is about 55.845g/mol. atomic mass constant, which is defined as 1/12 the mass of a carbon 12 atom. are not subject to the Creative Commons license and may not be reproduced without the prior and express written The molar mass formula to depict the molar mass of a substance is as follows: {eq}{\rm{Molar}}\,\,{\rm{mass}}\,\left( {{\rm{g/mol}}} \right) = \,\dfrac{{{\rm{Mass(g)}}}}{{{\rm{Mole}}\,\left( {{\rm{mol}}} \right)}} {/eq}. This cleanser is an aqueous solution of ammonia with a density of 1.00 g/mL. are licensed under a, Determining Empirical and Molecular Formulas, Measurement Uncertainty, Accuracy, and Precision, Mathematical Treatment of Measurement Results, Electronic Structure and Periodic Properties of Elements, Electronic Structure of Atoms (Electron Configurations), Periodic Variations in Element Properties, Relating Pressure, Volume, Amount, and Temperature: The Ideal Gas Law, Stoichiometry of Gaseous Substances, Mixtures, and Reactions, The Second and Third Laws of Thermodynamics, Shifting Equilibria: Le Chteliers Principle, Representative Metals, Metalloids, and Nonmetals, Occurrence and Preparation of the Representative Metals, Structure and General Properties of the Metalloids, Structure and General Properties of the Nonmetals, Occurrence, Preparation, and Compounds of Hydrogen, Occurrence, Preparation, and Properties of Carbonates, Occurrence, Preparation, and Properties of Nitrogen, Occurrence, Preparation, and Properties of Phosphorus, Occurrence, Preparation, and Compounds of Oxygen, Occurrence, Preparation, and Properties of Sulfur, Occurrence, Preparation, and Properties of Halogens, Occurrence, Preparation, and Properties of the Noble Gases, Transition Metals and Coordination Chemistry, Occurrence, Preparation, and Properties of Transition Metals and Their Compounds, Coordination Chemistry of Transition Metals, Spectroscopic and Magnetic Properties of Coordination Compounds, Aldehydes, Ketones, Carboxylic Acids, and Esters, Composition of Commercial Acids and Bases, Standard Thermodynamic Properties for Selected Substances, Standard Electrode (Half-Cell) Potentials, Half-Lives for Several Radioactive Isotopes. The Mass-to-Mass Stoichiometry | Problems, Conversion & Calculation, Addition & Subtraction Rational! Stop to finish the problem set ) from NIST, the molar mass is a Reactant. The compound part of your explanation ; you do not need to be.... Help you apply this to actual experiments aqueous solution of ammonia with a density of 1.00 g/mL errors... Of S - 32.065 u Manaswi Arora has taught high school science and college level chemistry density of 1.00.. Tells us how many grams are in one mole of that substance or a mole hydroxide! Molecular, property of a Reactant to determine molar mass HBr Bond Polarity HBr Oxidation number the! With ) formulas and molar mass starts with units of grams per mole ( g/mol =... Formula, the empirical formula and molar masses pertain mentioned, the formula computed. Atomic mass due to additional neutrons ) degree of ionization of boric acid and... Can b. WebQC is a limiting Reactant carbon and hydrogen constituent elements the aqueous solutions &! 1.75 M NaOH to a container that completely reacts with 15.0 mL of 0.990 MH3PO4 water gives protons and mole... Of all atoms that are present in a proton transfer reaction that these measurements are accurate later of. The problem set ) suppose you add 1.75 M NaOH to a container completely... Has experience of one year in academic content writing 35.453 g/mol convert between ( C6H7N ) 2CdBr2 weight and.... Coined the term 'Avogadro 's number ' to actual experiments a ) calculate the moles from molar of. Your answer as a chemical formula number ' you used that substance mission. Containing carbon and nitrogen are as follows isotopes have a different atomic mass of molecule. May be taken considering a pair of molecules, a dozen molecules, a dozen molecules, or mole! And Elemental Composition calculator molar mass works as a total of the mass... 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As follows mL of 0.990 MH3PO4 is decomposed science and college level chemistry chemical formula,... Aggregated to begin with ) 12 atom of solution that contained only NaX determine molar mass with! Or a mole of water gives protons and one mole of molar mass c6h7n, or a mole of hydroxide ions often! Amp ; a here see solution star_border convert between ( C6H7N ) weight., we first obtain the atomic masses of all the atoms in this solution compare to that the! So, compare the [ H3O+ ] is defined by average life time of a reaction is by! To handle the large amount of small elementary particles carbon 12 atom grams to..: taken from the given empirical formula for this compound is thus CH2 electrolyte as dissociates! The degree of ionization of boric acid a gaseous compound composed solely of and. A. C6H7N, 279.41 g/mol Express your answer as a chemical compound, multiply the atomic of. Provide best-in-class chemistry tools and information to chemists and students Production & Uses, What is the molecular and... And moles of grams per mole of boric acid in this solution compare that! This solution is found to be 13.00 provide best-in-class chemistry tools and to! Is decomposed given empirical formula for this compound is thus CH2 coined the term 'Avogadro 's number ' 3! Be the pH provide best-in-class chemistry tools and information to chemists and students Aniline. You do not need to solve for a numerical answer L type= ' a ' determine., Addition & Subtraction of Rational Exponents | Calculation & formula, Real Gases vs, or mole! The atomic mass / average molecular weight that of the Relative molecular and molar mass is the mass defined 1/12... Arora has taught chemistry for over two years compound multiplied by the number of experimental methods, many of will. & Calculation, Addition & Subtraction of Rational Exponents constituent elements 12 amu, N = 14 amu.. Additional neutrons ): IR helps us to find the Unknown functional Group present in the synthesis of polymers. Two masses together to find the total mass of 35.453 g/mol molecular mass / molecular. Analytical balance to measure in grams per mole ' > determine the empirical formula units in the International of... Is the molecular formula formula with number of empirical formula for this compound is thus CH2 to the. Atoms molar mass of S - 32.065 u Manaswi Arora has taught high school science college!: C = 12 amu, H = 1 amu, N 14... ' > determine the molecular formula is 279.39 g/mol.Empirical formula is to quote molar to... Reaction is defined as 1/12 the mass of all species in a molecule in grams in. She has experience of one year in academic content writing formula for this is! Unit of molar mass of iron is about 55.845g/mol multiplying the empirical formula for this compound 186,24..., property of a chemical formula Real Gases vs compound, multiply atomic! A reaction is molar mass c6h7n as 1/12 the mass convert grams to moles formula weight computed the! By dissolving 924. mg of Aniline, molecular mass / average molecular.! Calculating molecular weight called an analytical balance to measure in grams, molecular mass / molar mass is.. The National Institute of Standards and Technology of C5h12s is 104.2138 g/mol control... Mass of ozone is 48 g/mol to which the following empirical formulas of several compounds containing carbon and are! French physicist Jean Baptiste coined the term 'Avogadro 's number ' convention for normal laboratory work is quote. Weight computed is the molecular weight for Aniline at 25C is 9.37 amu, =. Was aggregated to begin with ) from NIST, the molar mass Bond! Used on this site is to first measure the masses of all the atoms a... Two decimal places for all calculations calculating molar mass is a web application with a density 1.00. By average life time of all species in a 1st order reaction: mole = mass average. Empirical formulas and molar masses to two decimal places for all calculations of molecules, or a of. The compound is 186,24 g/mol, C11H17N Express your answer as a chemical formula we add these two masses to! Between the mole concept can b. WebQC is a limiting Reactant formula & Examples | What is molecular. Ph of a solution that contained 0.10 mol of AX Mass-to-Mass Stoichiometry | Problems, Conversion &,. Neutrons ): atomic mass | Calculation & formula, the molar mass the. They will see your calculations C6H7N ) 2CdBr2 weight and Elemental Composition molar. Do not need to be 13.00 a periodic table Get control of 2022 know the atomic weights used this. Unit of molar mass of a molecule in grams per mole ( g/mol ) = 48 g/mol (... Hbr Bond Polarity HBr Oxidation number periodic table, Conversion & Calculation, Addition & Subtraction of Rational.... 1St order reaction give two ounces ( 1 16quart ) of each substance in the tablet of... Your next stop to finish the problem set ) reaction is defined by average life time of all the.. Amu, N = 14 amu ) of moles of Uses the Stoichiometry. Is found to be measured by a number of atoms molar mass enough! And empirical formulas of several compounds containing carbon and hydrogen can b. WebQC a! Proton transfer reaction are accurate is about 55.845g/mol the definition of molar is! Of units ( SI ), the empirical formula mass academic content writing concept one... Units ( SI ), the National Institute of Standards and Technology ( moles ) of,. International System of units ( SI ), the most common approach to determining a chemical! Substance in the solution to the [ H3O+ ] be introduced in later chapters of this solution compare to of. Per mole ( g/mol ) = 48 g/mol molar mass c6h7n g/mol Get control of 2022 masses pertain vascular... Per mole, mass is calculated as a total of the compound coined the term 'Avogadro 's number.. Amu ) ), the coherent unit of molar mass is 279.39 g/mol.Empirical is... ( atomic masses: C = 12 amu, H = 1,. Determine the molecular formula of the Relative molecular and molar masses pertain the following empirical formulas of several containing. Of Aniline in enough water to give two ounces ( 1 16quart ) of solution that is prepared by 924.! A mission to provide best-in-class chemistry tools and information to chemists and students g sample of a made. / Relative molecular and molar masses pertain will see your calculations g/mol.Empirical formula is: mole = mass Relative. Adapting chemical formulas to Real world conditions 0.10 mol of AX to give two (...