含溶质ag，溶剂bg的溶液，溶质的质量分数是（）A.ab×100%B.aa+b×100%C.ba+b×100%D.ba×100%

Question

含溶质a g，溶剂b g的溶液，溶质的质量分数是（　　）
A. (a)/(b)×100%
B. (a)/(a+b)×100%
C. (b)/(a+b)×100%
D. (b)/(a)×100%
(a)/(b)×100%
B. (a)/(a+b)×100%
C. (b)/(a+b)×100%
D. (b)/(a)×100%(a)/(b)aabb
(a)/(a+b)×100%
C. (b)/(a+b)×100%
D. (b)/(a)×100%(a)/(a+b)aaa+ba+b
(b)/(a+b)×100%
D. (b)/(a)×100%(b)/(a+b)bba+ba+b
(b)/(a)×100%(b)/(a)bbaa

Answer 1

溶液中含溶质a g，溶剂b g，溶液的质量=溶质的质量+溶剂的质量=ag+bg，溶质的质量分数为a/（a+b）×100%．