Calculate the mass of the salt formed as a result of the reaction of calcium hydroxide with nitric acid weighing 12.6 g.

Given:

m (HNO3) = 12.6 g

To find:

m (salt) -?

Decision:

HNO3 + KOH = KNO3 + H2O, – we solve the problem, relying on the composed reaction equation:

1) Find the amount of nitric acid that has reacted:

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

2) We compose a logical expression:

If 1 mol of HNO3 gives 1 mol of KNO3,

then 0.2 mol of HNO3 will give x mol,

then x = 0.2 mol.

3) we find the mass of potassium nitrate formed during the reaction:

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

Answer: m (KNO3) = 20.2 g.