When 7.1 ,gm ,N a_2 S O_4 (molecular mass 142) dissolves in 100 ,… - Vidyadip

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.}}$ =$\frac{{7.1 \times 1000}}{{142 \times 100}} = 0.5\,M$.

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