The concentration of urea in a solution prepared by dissolving 16 g of urea in 25 g of H₂O is ________% by mass. The molar mass of urea is 60.0 g/mol. A)39 B)64 C)0.39 D)0.64 E)0.48

Question

Quizplus · Accepted Answer

The mass percent of urea is calculated by dividing the mass of urea by the total mass of the solution and then multiplying by 100. The total mass of the solution is 16 g (urea) + 25 g (water) = 41 g. Thus, the mass percent of urea is (16 g / 41 g) * 100 = 39%.

The Concentration of Urea in a Solution Prepared by Dissolving