The correct name for the hydrate salt is calculated as follows
calculate the mass of water =mass of hydrated salt- mass of anhydrous salt
4.56-2.92=1.64g
mass of anhydrous salt (CuSo4)= 2.92g
calculate the mole of water and anhydrous salt
that is
moles =mass/molar mass
moles of water = 1.64g/18g/mol= 0.0911 moles
moles of CUSO4 =2.92g/ 159.5 g/mol=0.0183 moles
find the moles ratio by dividing with the smallest moles that is 0.0183 moles
for H20 = 0.0911/0.0183= 5
CuSO4 = 0.0183/0.0183=1
the formula hydrate salt = CuSO4.5H20 which is known as copper (ii) sulfate pentahydrate
