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Question

16 g of a compound having molar mass 200 g/mol is mixed with 40 g of water and the solution formed has density 1.4 g/mL.
Find the correct option(s).

A
The molality of the solution is 2 mol kg1
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B
The molarity of the solution is 2 mol L1
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C
The percentage by mass is 6.25%
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D
The percentage mass by vol is 40%
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Solution

The correct option is D The percentage mass by vol is 40%
a) Molality=16200 mol401000 kg=2 mol kg1

b) Molarity=16200 mol561.4 mL×1000=2 mol L1

c) Percent by mass=1656×100=28.6

d) Percent mass by volume=16561.4×100=40

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