已知t℃下Na 2 SO 3 的溶解度是S g.一定质量的Na 2 SO 3 溶液加入ag Na 2 SO 3 ,在t℃恰好饱和.若以Na 2 SO 3 ?7H 2 O代替Na 2 SO 3 ,也使原溶液在t℃恰好饱和,需加入Na 2 SO 3 ?7H 2 O(摩尔质量为252g?mol -1 )的质量是( )
A.
100a 100+S g
B.
200a 100-S g
C.
200a 100+S g
D.
100a 100-S g
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