14.8 g of a salt (z)dissolved in 250 cm3 of distilled water gives a concentration of 0.80 mol dm-3. Calculate the molar mass of the salt (z).

Answer Details

To find the molar mass of the salt (z), we need to use the formula: concentration (mol dm^-3) = number of moles / volume (dm³) We are given the concentration of the solution as 0.80 mol dm^-3 and the volume of the solution as 250 cm³ which is equivalent to 0.250 dm³. Therefore, we can rearrange the above formula to find the number of moles of the salt (z): number of moles = concentration x volume number of moles = 0.80 x 0.250 number of moles = 0.200 Now we can use the formula: molar mass (g mol^-1) = mass (g) / number of moles We are given the mass of the salt (z) as 14.8 g. Therefore: molar mass = 14.8 / 0.200 molar mass = 74.0 g mol^-1 Therefore, the molar mass of the salt (z) is 74.0 g mol^-1.