Aluminium is warmed with excess concentrated aqueous $\mathrm{NaOH}$: $2\mathrm{Al}+2\mathrm{NaOH}+6\mathrm{H}{}_2\mathrm{O}\to 2\mathrm{Na}[\mathrm{Al}(\mathrm{OH}){}_4]+3\mathrm{H}{}_2$. The moles of hydrogen liberated per mole of aluminium are

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