What mass of hydrogen will be released if 1 g of calcium is added to the water?

Calcium is an alkaline earth metal. Under normal conditions, it reacts with water with the evolution of hydrogen gas. The equation for this reaction can be written as follows:

Ca + 2 H2O = Ca (OH) 2 + H2

Molar mass of calcium = 40 g / mol; molar mass of hydrogen = 2 g / mol.

According to the reaction equation, we make up the proportion:

1 g of calcium corresponds to X g of hydrogen as

40 g / mol calcium corresponds to 2 g / mol hydrogen

X = (1 * 2) / 40 = 0.05 g of hydrogen

Answer: 0.05 grams of hydrogen