To obtain pure metals, hydrogen is used. In this way, tungsten is obtained from oxide WO3.

To obtain pure metals, hydrogen is used. In this way, tungsten is obtained from oxide WO3. write the reaction equation and calculate the mass of hydrogen required to obtain 2 mol of tungsten.

Given:
n (W) = 2 mol

Find:
m (H2) -?

1) WO3 + 3H2 => W + 3H2O;
2) n (H2) = n (W) * 3 = 2 * 3 = 6 mol;
3) m (H2) = n (H2) * M (H2) = 6 * 2 = 12 g.

Answer: H2 mass is 12 g.