\(12\mathrm{g}\) of \(\mathrm{Mg}\) (atomic mass 24) will react com...

\(12\mathrm{g}\) of \(\mathrm{Mg}\) (atomic mass 24) will react completely with hydrochloric acid to give

A. One mol of \(\mathrm{H_2}\)

B. \(1/2\) mol of \(\mathrm{H_2}\)

C. \(2/3\) mol of \(\mathrm{O_2}\)

D. both \(1/2\) mol of \(\mathrm{H_2}\) and \(1/2\) mol of \(\mathrm{O_2}\)