Chemistry - Concentration Terms Question with Solution | TestHub

The relation between Molarity$\left(\mathrm{M}\right)$and$\%$mass:
$\mathrm{M}=\frac{\%\mathrm{by}weight\times 10\times \mathrm{d}}{\mathrm{M}.\mathrm{w}}=\frac{36.5\times 10\times 1.2}{36.5}=\mathrm{12 }\mathrm{M}$
The relation between molality (m) and mass(%):
$\text{m}\text{=}\frac{\text{(w/w\%)}\text{×}\text{100}}{{\text{M}}_{\text{2}}\text{×}\text{(100}-\text{w/w\%)}}$$\mathrm{m}=\frac{36.5\times 1000}{36.5\times (100-36.5)}=\frac{1000}{63.5}=15.\mathrm{7 }\mathrm{m}$