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Percentage Composition

A gaseous mix...

Question

A gaseous mixture of propylene and methylene fluoride, occupies a volume of $2.40 L$ at $29^{\circ} C$ . The partial pressure of $C_{3} H_{6}$ is 0.130 atm and that of $C H_{2} F_{2}$ is 0.460 atm. How many moles of $C H_{3} H_{6}$ are in the sample? What is the total mass of the sample?

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Solution

Dalton's law of partial pressures states that in a gaseous mixture, the partial pressure exerted by a component is the same as it would exert if it alone occupied the container. The total pressure is the sum of the individual partial pressures.

$n_{p r o p a n e} = \frac{0.130. a t m \times 2.40 . L}{0.0821 . L . a t m . K^{- 1} m o l^{- 1} \times 302 K} = 0.0125 m o l$
$n_{m e t h y l e n e f l u o r i d e} = \frac{0.460 . a t m \times 2.40 . L}{0.0821 . L . a t m . K^{- 1} m o l^{- 1} \times 302 . K} = 0.044 m o l$

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