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Grade: 12
        Calculate the mole fraction of ethanol and water in a sample of rectified spirit which contains 92% ethanol by mass. Please give me answer
2 years ago

Answers : (1)

Gowtham
40 Points
							
the question states that the solution has 92% ethanol by mass
so if the solutions weighs 100gms , it contains 92gms of ethanol and 8gms of water 
no.of moles of ethanol = weight of ethanol / molecular weight of ethanol
molecular weight of ethanol is 46
no. of moles of ethanol is 92/46 i.e 2
no.of moles of water is 8/18 i.e 0.222
 
mole fraction of ethanol = no.of moles of ethanol / total number of moles
                                      = 2/2.222
                                      =0.90 (approx)
mole fraction of water =1-mole fraction of ethanol
                                    =1-0.9
                                    =0.1 (approx)
2 years ago
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