Chemical Forums
Chemistry Forums for Students => High School Chemistry Forum => Topic started by: gyromag on May 01, 2006, 08:03:12 PM
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Greetings,
I am having difficulty with calculating the mol ratio of argon (MW 39.95) to nitrogen (28.01) if the calculated MW is 28.15. This problem is taken from Zumdahl's Chemical Principals 2nd Ed. (Chapter 5 #29) and the answer is given at the back of the book as 1.18 X 10^-2. Can someone nudge me in the right direction on how to arrive at this response? Thanks!
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Try with molar fractions (http://www.chembuddy.com/?left=concentration&right=molar-fraction).
Assuming there is x of one and (1-x) of another, calculated molar mass is 39.95x + (1-x)*28.01.
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to do this wouldnt you need to know how many moles of each there were in the reaction? and where does that mass come from anyway?
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There is no reaction here, there is a mixture of two gases that behaves like gas of given molar mass.
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let mol% of Argon be x
=> mole% of Nitrogen = 1 - x
Average Molar Mass = x*(molar mass of Argon) + (1-x)*(molar mass of N2)
Solve for x