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AP Chemistry Practice Test
Multiple Choice
AP Chemistry
Multiple Choice Practice Test
Question 1 of 3
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A mixture of methane and helium is placed in a 2.0 L flask at 27 degrees Celsius. The partial pressure of CH4 is 0.72 atm and the partial pressure of helium is 0.22 atm. What is the mole fraction of methane?
A
0.77
B
3.5
C
0.50
D
0.29
E
0.23
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