## Chemistry: The Central Science (13th Edition)

Published by Prentice Hall

# Chapter 10 - Gases - Exercises: 10.48

CO2, SO2, HBr

#### Work Step by Step

We have the formula d = PM/RT where d is the density and M is the molar mass. This means that density and molar mass are proportional so that the larger the molar mass, the more dense the gas is. Therefore we find the molar masses of the gases given: SO2: S is 32 g/mol and O is 16g/mol so 32 + 2*16 = 64 g/mol HBr: H is 1g/mol and Br is 79.904 so 1 + 79.904 = 80.904 g/mol CO2: C is 12g/mol and O is 16g/mol so 12 + 2*16 = 44 g/mol We arrange them in order of increasing molar mass: CO2, SO2, HBr and since molar mass is proportional to density we have the same order for the denstiy

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