Some Basic Concepts Of Chemistry

$12 \mathrm{~L} \,\mathrm{HCl}(\mathrm{aq})$ is consumed for every $6 \mathrm{~L} \,\mathrm{H}_2(\mathrm{~g})$ produced.

$11.2 \mathrm{~L} \,\mathrm{H}_2(\mathrm{~g})$ at STP is produced for every mole of HCl consumed.

$33.6 \mathrm{~L} \,\mathrm{H}_2(\mathrm{~g})$ is produced regardless of temperature and pressure for every mole of Al that reacts.

$67.2 \mathrm{~L} \,\mathrm{H}_2(\mathrm{~g})$ at STP is produced for every mole of Al that reacts.