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Mole Concept

Active mass o...

Question

Active mass of $2$ moles of $N a C l$ kept in $4$ litre vessel at NTP is:

A

1

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B

2

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C

\frac{1}{2}

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D

not defined

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Solution

The correct option is B $\frac{1}{2}$
$A c t i v e M a s s = \frac{M o l e s}{V o l u m e i n l i t r e}$

$M o l e s = 2 m o l e s$

$V o l u m e = 4 l i t r e$

$A c t i v e M a s s = \frac{2}{4} = \frac{1}{2} = 0.5$

Active mass of NaCl is $0.5 m o l / L$ or $0.5 M$ .

Hence, option $C$ is correct.

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