250cm³ of distilled water contains 14.8g of salt(z)
1cm³ of distilled water will contain $\frac{14.8x1}{250}$ of salt (z)
:. 1000cm³ of distilled water will contain $\frac{14.8x1x1000}{250}$ = 59.2g/dm³of salt (z) Concentration in mol/dm³ = \(\frac{concentration in g/dm³}{molar mass}
0.80 = $\frac{59.2}{molarmass}$
molar mass = $\frac{59.2}{0.80}$ = 74.0 g/mol