What is the mass of the salt obtained by the interaction of calcium oxide weighing 28 g with nitric acid?

We draw up the reaction equation and place the coefficients: CaO + 2HNO3 = Ca (NO3) 2 + H2O.
1) Find the amount of calcium oxide substance. To do this, divide the mass of the oxide by its molar mass. The molar mass is according to the periodic table: 28/56 = 0.5 mol.
2) According to the reaction equation, one mole of calcium oxide accounts for one mole of calcium nitrate. This means that the amount of the substance of the desired compound is 0.5 mol.
3) Find the mass of calcium nitrate. To do this, multiply its amount of substance by the molar mass: 0.5 * 164 = 82g – the answer.