How to Calculate an Empirical Formula from Percentage? Given: Find: Assume Mass % Use Grams of each element 100-g sample Empirical formula Calculate mole ratio Moles of each element elements molar mass 3. 4. A molecule containing only nitrogen and oxygen contains (by mass) 36.8% N. a) How many grams of N would be found in a 100 g sample of the compound? 100g x 36.8 = 36.89N How many grams of O would be found in the same sample? L03.290 100S-30.89 = lo3.2g0 b) How many moles of N would be found in a 100 g sample of the compound? Imol NatoYS 36.89+DO l679 = Z,663 mol Natoms 14,00679 g N atoms How many moles of O would be found in the same sample? 63.29) Imol D atoms 15.99949 O atoms = 3.95 mor O atorrs c) What is the ratio of the number of moles of O to the number of moles of N? =1.5=12 =30 2 N 3.95 Datoms %3D 11 2.663 N atoms d) What is the empirical formula of the compound? Nz O3 5. Mercury chlorine contains 73.9% mercury and 26.1% chlorine by mass. What's the empirical formula of mercury chlorine? How to determine a Molecular Formula? 6. Mesitylene, a hydrocarbon found in crude oil, has an empirical formula of C3H4 and an experimentally determined molecular weight of 121 amu. What is its molecular formula?

How to Calculate an Empirical Formula from Percentage? Given: Find: Assume Mass % Use Grams of each element 100-g sample Empirical formula Calculate mole ratio Moles of each element elements molar mass 3. 4. A molecule containing only nitrogen and oxygen contains (by mass) 36.8% N. a) How many grams of N would be found in a 100 g sample of the compound? 100g x 36.8 = 36.89N How many grams of O would be found in the same sample? L03.290 100S-30.89 = lo3.2g0 b) How many moles of N would be found in a 100 g sample of the compound? Imol NatoYS 36.89+DO l679 = Z,663 mol Natoms 14,00679 g N atoms How many moles of O would be found in the same sample? 63.29) Imol D atoms 15.99949 O atoms = 3.95 mor O atorrs c) What is the ratio of the number of moles of O to the number of moles of N? =1.5=12 =30 2 N 3.95 Datoms %3D 11 2.663 N atoms d) What is the empirical formula of the compound? Nz O3 5. Mercury chlorine contains 73.9% mercury and 26.1% chlorine by mass. What's the empirical formula of mercury chlorine? How to determine a Molecular Formula? 6. Mesitylene, a hydrocarbon found in crude oil, has an empirical formula of C3H4 and an experimentally determined molecular weight of 121 amu. What is its molecular formula?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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