0.5 g of hydrogen with what mass of zinc can react with hydrochloric acid?

1. Let’s write down the reaction equation.

Zn + 2HCI = ZnCI2 + H2.

2. Let’s find the amount of substance of the released hydrogen:

1 mol H2 = 2 g. Then 0.5 g / 2 g / mol = 0.25 mol.

3. According to the equation, 1 mole of hydrogen will be released upon interaction with HCI 1 mole of zinc. Therefore, 0.25 mol of Zn entered into the reaction.

4. Find the mass of Zn: 0.25 mol * 65 g / mol = 16.25 g.