Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 8 - Properties of Gases - Problem Solving Practice 8.6 - Page 339: a

Answer

M = 132, Xenon

Work Step by Step

20.0-g sample of a pure gas in a 2.50-L sealed flask at 10.0 °C is 1.41 atm P = 1.41 atm, m = 20.0 g, V = 2.5 L, T = 273.15 + 10 = 283.15 K M = mRT/PV M = 20 x 0.0821 x 283.15 / 1.41 x 2.5 = 132 g/mol Xenon has the molar mass mass of 131.3 g/mol, wich is very close to 132 g/mol.
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