$d$દ્રાવણ $=1.25 \mathrm{~g} / \mathrm{mL}]$
$=500 \times 1.25=625 \mathrm{~g}$
$\text { Mass of solute }(x)=0.2 \times 0.5 \times 159.5$
$=15.95$
$\mathrm{n}_{\text {solute }}=0.1 \text {, }$
$\text { Mass of solvent }=\text { Mass of solution }- \text { Mass of solute }$
$=625-15.95$
$=609.05$
$\mathrm{~m}=\frac{0.1}{\frac{609.05}{1000}}$
$\mathrm{~m}=0.164=164 \times 10^{-3}$
(A) $0.00253$ (B) $1.0003$ (C) $15.0$ (D) $163$
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