How much hydrogen is required to obtain manganese from manganese (IV) oxide. What is the equation for this problem?

Reaction equation:

MnO2 + 2H2 = Mn + 2H2O

The condition does not indicate the mass of manganese oxide; in the general case, the solution looks like this:

n (MnO2) = m (MnO2) / Mr (MnO2) = m (MnO2) / 87 =… (mol);

n (H2) = 2 * n (MnO2);

V (H2) = n (H2) * Vm = n (H2) * 22.4 = … (l).

If the condition gives the mass of manganese that must be obtained, then in the general case the solution is as follows:

n (Mn) = m (Mn) / Mr (Mn) = m (Mn) / 55 =… (mol);

n (H2) = 2 * n (Mn);

V (H2) = n (H2) * Vm = n (H2) * 22.4 = … (l).