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In a certain compound %age of an element ( atomic mass 12) is 92.3%. What is its mole fraction?
dear deeksha sharma,
as i think your question is not complete because to calculate mole fraction you have the mixture of two or more than two compounds.....if i consider that we have to find out the mole fraction within the compound then we need empirical formula of that compound or the other element/s present in the compound.
if i consider that this question is complete than lets consider the empirical formula 1:n (only two elements are present).
one element is carbon (at. mass = 12 given in question)
lets choose second element is some X......and the atomic weight is Mx
then molecular weight of compound CXn = (12+Mxn)
from question:
12 = (12+Mxn)*92.7/100
this gives Mxn = 1 : only one case is possible now that is for hydrogen. and the n=1.
compound would be C2H2 (ethyne)
and mole fraction would be 1/2 =0.5
so u can see it all depend on empirical formula.
so please cross check your question
regard
deepak kumar singh
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