Chemistry-(general)
NEET Chemistry (general) MCQ Question
Type: MCQ-numerical-Hard-Class 12
Calculate the mole fraction of water in a solution if the solution contains 20% ethylene glycol by mass and the molar mass of ethylene glycol (C2H6O2) is 62 g/mol.
A
0.80
B
0.38
C
0.62
D
0.82
Correct Answer
Option B
Detailed Explanation
The solution contains 20 g of ethylene glycol and 80 g of water. The moles of ethylene glycol are 20/62 and the moles of water are 80/18. The mole fraction of water is calculated as the moles of water divided by the total moles of the solution.
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