Find mass from mole frac and solution mass

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SUMMARY

The discussion focuses on calculating the masses of propane and butane in a 75g gaseous mixture with a mole fraction of 0.51 for propane. The user attempts to set up equations based on mole fractions but struggles to incorporate the total mass of the solution effectively. The correct approach involves using the relationships between moles, mass, and mole fractions to derive the individual masses of propane and butane accurately.

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1. 75g sample of a gaseous mixture contains .51 mole fraction propane. The remainder is butane. What are the masses of propane and butane?



2. X = mol A / mol total



The Attempt at a Solution


P = mol propane
B = mol butane
I tried doing .49P + .49B = X mol propane and .51P + .51B = Y mol butane however that doesn't seem to be solvable. I'm not quite sure how I should manipulate the 75 g of solution.
 
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0.49B + 0.51P = n

second equation must contain masses of both gases - what is a mass of 0.49B?
 

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