Chemistry: The Central Science (13th Edition)

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

Chapter 10 - Gases - Exercises: 10.37a

Answer

5.15 x 10^22 molecules

Work Step by Step

We are given the Volume (2.25L), Temperature (37C) and the pressure (735 torr) so we can find the number of moles. First we convert the temperature to Kelvin by adding 273 so we have 310K and we convert the torr to atm as follows: 735 torr * (1 atm/ 760 torr) = 0.967 atm Then we have PV = nRT and we are solving for n so we have: n = PV/RT = (0.967 atm) * (2.25L) / (0.0821 * 310K) = 0.0855 mol Then to find the number of molecules, we multiply by Avogadro's number 6.02 x 10^23 and we have: 5.15 x 10^22 molecules
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