MCQ
When $7.1\,gm\,N{a_2}S{O_4}$ (molecular mass $142$) dissolves in $100\,ml\,{H_2}O$, the molarity of the solution is ......... $M$
- A$2.0$
- B$1.0$
- ✓$0.5$
- D$0.05$
✓
Answer
Correct option: C.
$0.5$
c
(c) Molarity $ = \frac{{w \times 1000}}{{ml{\rm{ wt}}{\rm{. }} \times {\rm{Volume }}ml.}}$ =$\frac{{7.1 \times 1000}}{{142 \times 100}} = 0.5\,M$.
(c) Molarity $ = \frac{{w \times 1000}}{{ml{\rm{ wt}}{\rm{. }} \times {\rm{Volume }}ml.}}$ =$\frac{{7.1 \times 1000}}{{142 \times 100}} = 0.5\,M$.
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