Determine the mass of nitric acid required to dissolve 5.6 g of calcium oxide.

To solve the problem, let’s compose the equation:
X g -? m = 5.6 g;
1. 2HNO3 + CaO = Ca (NO3) 2 + H2O – ion exchange, obtained calcium nitrate, water;
2. We make calculations:
M (HNO3) = 63 g / mol;
M (CaO) = 56 g / mol.
3. Determine the amount of the original substance:
Y (CaO) = m / M = 5.6 / 56 = 0.1 mol.
4. Proportion:
X mol (НNO3) – 0.1 mol (CaO);
-2 mol -1 mol hence, X mol (HNO3) = 2 * 1.1 / 1 = 0.2 mol.
5. Find the mass of acid:
m (HNO3) = Y * M = 0.2 * 63 = 12.6 g.
Answer: to carry out the process, nitric acid with a mass of 12.6 g is required.