Answer:
24 g/mol.
Step-by-step explanation:
To calculate the molar mass of the salt (z), we need to use the formula:
concentration = number of moles / volume of solution
We know that the concentration is 0.80 mol/dm^3, and the volume of the solution is 250 cm^3, which is equivalent to 0.25 dm^3. Therefore, we can rearrange the formula to solve for the number of moles of salt (z):
number of moles = concentration x volume of solution
number of moles = 0.80 mol/dm^3 x 0.25 dm^3
number of moles = 0.20 mol
Next, we can calculate the mass of salt (z) in the solution using the formula:
mass = number of moles x molar mass
We know that the mass of salt (z) is 4.8 g, and we just calculated that the number of moles is 0.20 mol. Therefore, we can rearrange the formula to solve for the molar mass:
molar mass = mass / number of moles
molar mass = 4.8 g / 0.20 mol
molar mass = 24 g/mol
Therefore, the molar mass of the salt (z) is 24 g/mol.