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Question

Calculate the mass of H2O and C2H5OH required to make 640 gm mixture having XH2O and XC2H5OH equal to 0.5


A

640 gm, 640 gm

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B

180 gm, 180 gm

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C

180 gm, 460 gm

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D

460 gm, 180 gm

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Solution

The correct option is C

180 gm, 460 gm


It is given that

XH2O=XC2H5OH=0.5

But XH2O=Moles of H2OMoles of H2O + Moles of C2H5OH=0.5

Moles of H2O = Moles of C2H5OH
1 mole of H2O = 18 gm
1 mole of C2H5OH = 46 gm
This gives 64 gm
for 640 gm, we need 10 moles each 180 gm H2O and 460 gm C2H5OH


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