Chapter 10.8, Problem 2.1ACP

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

At sea level, atmospheric pressure is 1.00 atm. Calculate the density (in g/L) of helium at this pressure and 25 °C.

Interpretation Introduction

Interpretation:

The density of helium at 1atmand25°C has to be calculated.

Concept Introduction:

Density of a gas can be find out with the help of ideal gas equation which is

PV=nRT

n in the given equation can be written as mM Since amount of any substance is given by dividing mass with molar mass.

PV=mMRTmV=PMRTdensity=PMRT

Explanation

The density of helium at given conditions using the given data.

We know that densityâ€‰=â€‰PMRT

Given:

â€‚Â Molarâ€‰massâ€‰ofâ€‰Heâ€‰=â€‰4g/molPâ€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰=â€‰â€‰â€‰â€‰â€‰1â€‰atmTâ€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰=â€‰25Â°Câ€‰â€‰â€‰â€‰â€‰â€‰=â€‰â€‰298â€‰K

â€‚Â densityâ€‰=â€‰PM

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