- 15

- 0

A 5.07g

B 8.58g

C 23.44g

D 64.9g

i will show my calculation here,but i don't think its correct because my answer wrong .please state out my mistake.

P(B) = X(B) x P(pure B)

20 = (0.2/W+0.2) x 75

W =0.55

mass of W = 0.55x118

= 64.90g

the actual answer is B,i think my answer is unreasonable too,cause the mass is too big,but from my calculation,i get 64.9g.why??????