Which of the following amounts of solution contain 20.0 g of solute?
A) 100.0 g of 20.0% (m/m) NaCl solution
B) 500.0 g of 4.00% (m/m) NaCl solution
C) 200.0 g of 10.0% (m/m) NaCl solution
D) more than one correct response
E) no correct response

Question

Quizplus · Accepted Answer

To determine the correct response, we need to use the formula:
mass of solute = % (m/m) x mass of solution
where % (m/m) is the mass fraction of the solute in the solution.
For option A:
mass of solute = 20.0 g
mass of solution = 100.0 g
% (m/m) = (mass of solute/mass of solution) x 100%
% (m/m) = (20.0 g/100.0 g) x 100%
% (m/m) = 20%
For option B:
mass of solute = 20.0 g
mass of solution = 500.0 g
% (m/m) = (mass of solute/mass of solution) x 100%
% (m/m) = (20.0 g/500.0 g) x 100%
% (m/m) = 4%
For option C:
mass of solute = 20.0 g
mass of solution = 200.0 g
% (m/m) = (mass of solute/mass of solution) x 100%
% (m/m) = (20.0 g/200.0 g) x 100%
% (m/m) = 10%
Therefore, options A, B, and C all contain 20.0 g of solute. The correct response is D, more than one correct response.

Which of the Following Amounts of Solution Contain 20