Chemistry-(general)
NEET Chemistry (general) MCQ Question
Type: MCQ-numerical-Easy-Class 12
Calculate the mole fraction of ethylene glycol (C2H6O2) if the solution contains 20% of C2H6O2 by mass and the rest is water. Assume the total mass of the solution is 100 g.
A
0.062
B
0.200
C
0.333
D
0.800
Correct Answer
Option A
Detailed Explanation
In the given solution, ethylene glycol is 20 g and water is 80 g. The moles of ethylene glycol are 20 g / 62 g/mol = 0.323 mol, and moles of water are 80 g / 18 g/mol = 4.444 mol. The mole fraction of ethylene glycol is 0.323 / (0.323 + 4.444) = 0.062.
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