Final answer:
The relative formula mass of the ionic salt is calculated by dividing the given mass of the salt (27.75 grams) by the number of moles (0.25 moles), resulting in a relative formula mass of 111 g/mol.
Step-by-step explanation:
To calculate the relative formula mass (RFM) of an ionic salt, two pieces of information are required: the mass of the salt and the number of moles of the salt. In this case, we are given that 27.75 grams of the salt is 0.25 moles.
Step 1: Calculate the Relative Formula Mass (RFM)
Relative Formula Mass = Mass of the Salt (g) / Number of Moles of the Salt (mol)
For the given salt:
RFM = 27.75 g / 0.25 mol
RFM = 111 g/mol
Thus, the relative formula mass of the ionic salt is 111 g/mol.