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.