Determine the volume of hydrogen in the interaction of 100 g of 20% formic acid solution with magnesium.

Magnesium dissolves in formic acid solution. The reaction is described by the following chemical equation:

Mg + 2HCOOH = Mg (HCOO) 2 + H2 ↑;

Let’s calculate the molar amount of the formic acid substance.

To do this, divide its weight by the weight of 1 mole of formic acid.

M HСOOH = 1 + 12 + 16 x 2 + 1 = 46 grams / mol;

N HCOOH = 100 x 0.2 / 46 = 0.4348 mol;

In the course of the reaction, 2 times less hydrogen will be released.

Let’s determine the volume of hydrogen.

For this purpose, we multiply the amount of substance by the volume of 1 mole of gas (filling volume 22.4 liters).

V H2 = 0.4348 / 2 x 22.4 = 4.8698 liters;