Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 10 - Gases - Exercises - Page 436: 10.52b


170.7 g/mol

Work Step by Step

We have d = PM/RT or M = dRT/P. First we need to place everything in the proper units. We have 743 torr so we convert it to atm: 743 torr * (1atm/760 torr) = 0.978 atm Then we convert the temperature from 12C to Kelvin by adding 273 so we have 285K. Then we have M = dRT/P = (7.135 g/L * 0.0821 * 285K) / 0.978 atm = 170.7 g/mol
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