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A closed vessel contains equal masses of $H X_{2}$ (2), $He$ (4) and $CH X_{4}$ (16) at the same temperature. Which statements are correct?

AThe mole ratio $H X_{2} : He : CH X_{4}$ is $8 : 4 : 1$
BThe partial pressure of $H X_{2}$ is $8/13$ of the total pressure
CThe partial pressure of $CH X_{4}$ is the smallest
DThe partial pressures are in the ratio of the molar masses

Answer: A, B, C

For mass

w

each: moles

w /2 : w /4 : w /16 = 8 : 4 : 1

(A).

x_{H X_{2}} = 8/13

(B).

CH X_{4}

has the fewest moles, so the lowest partial pressure (C). Partial pressures follow moles, i.e. inversely to molar mass, so (D) is wrong.

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