Calculate what mass of salt is formed by the interaction of a) potassium oxide with nitric acid m = 12.6 g.

| June 19, 2021 | education

Calculate what mass of salt is formed by the interaction of a) potassium oxide with nitric acid m = 12.6 g. B) aluminum with sulfuric acid with the amount of substance n = 0.3 mol?

a) Let us write the equation for the reaction of potassium oxide with nitric acid.

K2O + 2HNO3 = 2KNO3 + H2O

The resulting salt is potassium nitrate.

Knowing the mass of nitric acid, we calculate the number of moles.

n (HNO3) = m / M = 12.6 / 63 = 0.2 mol

According to the reaction equation n (HNO3) = n (KNO3). Therefore, n (KNO3) = 0.2 mol.

m (KNO3) = n * M = 0.2 * 101 = 20.2 g

b) Write down the equation for the reaction of aluminum with sulfuric acid (when heated).

2Al + 3H2SO4 = Al2 (SO4) 3 + 3H2

The resulting salt is aluminum sulfate.

According to the reaction equation, from 3 mol of sulfuric acid, 1 mol of salt is formed. This means that when n (H2SO4) = 0.3 mol, n (Al2 (SO4) 3) = 0.3 / 3 = 0.1 mol.

m (Al2 (SO4) 3) = n * M = 0.1 * 342 = 34.2 g



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