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deeksha sharma Grade: 11
        

In a certain compound %age of an element ( atomic mass 12) is 92.3%. What is its mole fraction?

7 years ago

Answers : (1)

deepak kumar singh AskiitiansExpert-IITM
16 Points
										

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

7 years ago
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