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When `7.1gm Na_(2)SO_(4)` (molecular mass 142) dissolve in `100 ml H_(2)O`, the molarity of the solution is

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When `7.1gm Na_(2)SO_(4)` (molecular mass 142) dissolve in `100 ml H_(2)O`, the molarity of the solution is
A. 2.0 M
B. 1.0 M
C. 0.5 M
D. 0.05 M
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Correct Answer - C
Molarity `=(w xx 1000)/(ml wt. xx "Volume ml.")=(7.1xx1000)/(142xx100)=0.5 M`.
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