Chapter 10, Problem 30PS

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

# Acetaldehyde is a common liquid compound that vaporizes readily. Determine the molar mass of acetaldehyde from the following data:Sample mass = 0.107 g Volume of gas = 125 mLTemperature = 0.0 °C Pressure = 331 mm Hg

Interpretation Introduction

Interpretation:

The molar mass of acetaldehyde has to be determined.

Concept Introduction:

density=massvolume

density=PMRT

P-PressureM-MolarmassR-UniversalgasconstantT-Temperature

Explanation

Given that:

Â Â Â Â Â massâ€‰ofâ€‰theâ€‰compoundâ€‰=â€‰0.107â€‰gvolumeâ€‰â€‰â€‰â€‰â€‰=â€‰125â€‰mlâ€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰=â€‰0.125â€‰LPressureâ€‰=â€‰331â€‰mmâ€‰Hgâ€‰â€‰=â€‰0.4355â€‰atmTemperatureâ€‰=â€‰0Â°Câ€‰â€‰â€‰=â€‰273â€‰K

â€‚Â densityâ€‰=â€‰massvolumeâ€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰=â€‰0.107â€‰g0.125â€‰Lâ€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰=â€‰0

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