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: 10.51b


80.15 g/mol

Work Step by Step

We have the equation M = dRT/P were d is the density and M is the molar mass. We have that 2.50g occupies 0.875L so we divide the two to find the density in g/L is 2.857 g/L Then we convert the 35C to Kelvin by adding 273, 308K. Then we convert the 685 torr to atm: 685 torr * (1atm/760 torr) = 0.901 atm Now we have M = (2.857 g/L * 0.0821 * 308K) / 0.901atm = 80.15 g/mol
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