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Question

The mole fraction of the solute in a 1 molal aqueous solution is:

A
1
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B
1.8
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C
18
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D
0.018
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Solution

The correct option is D 0.018
1 molal aqueous solution means 1 mole of solute in 1 kg (or 1000 g) of water.
The molecular weight of water is 18 g/mol.

The number of moles of water =1000g18g/mol=55.56mol

The mole fraction of the solute =1mol1mol+55.56mol=0.018

Thus, option D is correct.

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