A gas mixture consists of equal masses of methane (molecular weight 16.0) and argon (atomic weight 40.0). If the partial pressure of argon is 200. torr, what is the pressure of methane, in torr? Hint: what is the mole fraction of each gas?
a. 256 torr
b. 556 torr
c. 80.0 torr
d. 200. torr
e. 500. torr
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