
The mole fraction of , in a solution containing 1 mole of 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 ) to (No of moles of whole solution). And then we have to use the formula for calculating mole fraction i.e;
Mole fraction=
Complete step-by-step answer:
No. of moles of = = =55.55
No. of moles of NaCl= 1
Mole fraction of NaCl=
=
=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.
Mole fraction=
Complete step-by-step answer:
No. of moles of
No. of moles of NaCl= 1
Mole fraction of NaCl=
=
=0.01768
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.
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