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