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A solution is made by dissolving 120 g of urea (molar mass 60 g/mol) in 1000 g of water; the resulting solution has density 1.15 g/mL. Calculate its molarity.

2.05 M
0.50 M
1.78 M
1.02 M

Correct answer: 2.05 M

Solution

2 mol urea in a solution whose volume is 1120/1.15 = 973.9 mL gives molarity 2/0.9739 = 2.05 M.

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