Calculate the mass and amount of the sodium sulfate substance that is formed in the reaction

Calculate the mass and amount of the sodium sulfate substance that is formed in the reaction of 80 g of sodium hydroxide with sulfuric acid.

Formation of sodium sulfate as a result of the interaction of sodium hydroxide and sulfuric acid.
2NaOH + H2SO4 = Na2SO4 + 2H2O.
Determine the number of moles of alkali.
n (2NaOH) = m / Mr = 80 g / 2 • 40 g / mol = 1 mol.
The amount of sodium sulfate moles will be half as much.
n (Na2SO4) = 1 mol / 2 = 0.5 mol.
The mass of the formed sulfate will be equal to
m (Na2SO4) = n • Mr = 0.5 mol • 142 g / mol = 71 g.