Calculate the volume of hydrogen that can be obtained by the action of an excess of hydrochloric

Calculate the volume of hydrogen that can be obtained by the action of an excess of hydrochloric acid solution on 4.0 g of calcium

Given:
m (Ca) = 4.0 g

Find:
V (H2) -?

Solution:
1) Write the equation of a chemical reaction:
Ca + 2HCl => CaCl2 + H2 ↑;
2) Using the periodic system of D.I.Mendeleev, calculate the molar mass of Ca, which will be numerically equal to the molecular mass:
Mr (Ca) = Ar (Ca) = 40 g / mol;
3) Calculate the amount of Ca substance:
n (Ca) = m (Ca) / Mr (Ca) = 4/40 = 0.1 mol;
4) Determine the amount of substance H2 (taking into account the coefficients in the reaction equation):
n (H2) = n (Ca) = 0.1 mol;
5) Calculate the volume H2:
V (H2) = n (H2) * Vm = 0.1 * 22.4 = 2.24 liters.

Answer: The volume of H2 is 2.24 liters.