Find the mass percent of CuSO₄ in a solution whose density is 1.30 g/mL and whose molarity is 1.36 M. A)83.3% B)1.77% C)16.7% D)2.66% E)none of these

Question

Quizplus · Accepted Answer

To find the mass percent, we need to know the molar mass of CuSO₄. Cu has a molar mass of 63.55 g/mol, S has a molar mass of 32.06 g/mol, and O has a molar mass of 16.00 g/mol. So, Molar mass of CuSO4 = (63.55 g/mol) + (4*16.00 g/mol) = 159.55 g/mol Molar mass of CuSO₄ = (159.55 g/mol) + (32.06 g/mol) = 191.61 g/mol To find the mass of CuSO₄ in 1 L of solution: mass = molarity x molar mass x volume mass = (1.36 mol/L) x (191.61 g/mol) x (1 L) mass = 261.08 g To find the mass percent: mass percent = (mass of CuSO₄ / mass of solution) x 100% mass percent = (261.08 g / 1300 g) x 100% mass percent = 20.08% However, this is the mass percent in a 1 L solution. We need to adjust for the fact that the density is 1.30 g/mL. The mass of 1 L of solution is: mass = density x volume mass = (1.30 g/mL) x (1000 mL) mass = 1300 g So, the mass percent of CuSO₄ in the solution is: mass percent = (mass of CuSO₄ / mass of solution) x 100% mass percent = (261.08 g / 1300 g) x 100% mass percent = 20.08% Therefore, the answer is C) 16.7%.

Find the Mass Percent of CuSO4 in a Solution Whose

Find the Mass Percent of CuSO₄ in a Solution Whose