CHEMISTRY 1414
Fall 2011
Practice Problem Set 6
Question 1
A sample of sodium perchlorate is decomposed according to the following reaction:
NaClO
4 (
s
)
Æ
NaCl
(
s
)
+
O
2 (
g
)
The oxygen gas produced is collected over water at 19.25 °C.
If the gas is collected in a
425 mL container and the total pressure exerted by the gas sample is 0.855 atm, what
mass in grams of NaClO
4
was decomposed?
The vapor pressure of water at 19.25 °C is
16.7 torr.
Question 2
Calculate the density of silane (SiH
4
) gas at 32.5 °C at a pressure of 1327 torr.
Question 3
A sample of helium gas at a pressure of 855 torr occupies a volume of 328 mL.
If the
pressure changes to 1.22 atm, what volume will the gas occupy?

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