7. A compound is composed of carbon, hydrogen and oxygen. It was analysed and the folloWIng results were obtained: o Mass of sample = 30.50 g o Mass of carbon in sample = 12.08 g o Mass of hydrogen in sample 2.06 g a. Find its empirical formula. b. If the relative molecular mass of the compound is 180, find its molecular formula.

7. A compound is composed of carbon, hydrogen and oxygen. It was analysed and the folloWIng results were obtained: o Mass of sample = 30.50 g o Mass of carbon in sample = 12.08 g o Mass of hydrogen in sample 2.06 g a. Find its empirical formula. b. If the relative molecular mass of the compound is 180, find its molecular formula.

World of Chemistry, 3rd edition

3rd Edition

ISBN:9781133109655

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

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

Chapter6: Chemical Composition

Section: Chapter Questions

Problem 4STP

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Concept explainers

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.

Question

7. A compound is composed of carbon, hydrogen and oxygen. It was analysed and the fóllowing
results were obtained:
o Mass of sample = 30.50 g
o Mass of carbon in sample = 12.08 g
o Mass of hydrogen in sample = 2.06 g
%3D
a. Find its empirical formula.
b. If the relative molecular mass of the compound is 180, find its molecular
formula.

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