Answer to Question #112939 in General Chemistry for Lauren Barad

Question

A solution is prepared by dissolving 20g benzene in 100g carbon tetrachloride, what is the % by mass of the solution?

a. 17%
b. 20%
c. 83%
d. 500%

Answer 1

Solution:

m(C₆H₆) = 20 g

m(CCl₄) = 100 g

m(solution) = m(C₆H₆) + m(CCl₄) = 20g + 100g = 120 g

w(C₆H₆) = m(C₆H₆)/m(solution)*100% = 20g/120g*100% = 17%

Answer: 17%