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The mole fraction of NaCl, in a solution containing 1 mole of NaCl in 1000g of water:
A. 0.0177
B. 1.001
C. 0.5
D. 0.244

Answer
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Hint: For solving this question, first we have to find the ratio of (No. of moles of NaCl) to (No of moles of whole solution). And then we have to use the formula for calculating mole fraction i.e;
Mole fraction=no.ofmolesofNaClno.ofmolesofSolution

Complete step-by-step answer:
No. of moles of H2O = WeightMolecular.Mass =100018 ​ =55.55
 No. of moles of NaCl= 1

Mole fraction of NaCl=no.ofmolesofNaClno.ofmolesofNaCl+no.ofmolesofH2O
                                                      =155.55+1
                                                      =0.01768 0.0177
Thus option A “0.0177” is the correct answer to the problem.

Note: For solving this question, one should know the molecular mass of an element and should also know how to calculate the no. of moles.