Question

In the reaction,
$2Al\left(s\right)+6HCl\left(aq\right)\to 2A{l}^{3+}\left(aq\right)+6C{l}^{-}\left(aq\right)+3H_2\left(g\right)$

• A. $22.4L$ $H_2\left(g\right)$ at STP is produced for every mole $HCl\left(aq\right)$ consumed
• B. $6L$ $HCl\left(aq\right)$ is consumed for every $3L$ $H_2\left(g\right)$ produced
• C. $33.6L$ $H_2\left(g\right)$ is produced regardless of temperature and pressure for every mole $Al$ that reacts
• D. $67.2L$ $H_2\left(g\right)$ at STP is produced for every mole $Al$ that reacts

Answer 1

The correct option is C $33.6L$ $H_2\left(g\right)$ is produced regardless of temperature and pressure for every mole $Al$ that reacts

$2Al\left(s\right)+6HCl\left(aq\right)\to 2A{l}^{3+}\left(aq\right)+6C{l}^{-}\left(aq\right)+3H_2\left(g\right)$
At STP, 6 moles of HCl produces 3 moles
or $3\times 22.4L$ of $HCl$
$\therefore$ 1 mole of HCl produces $\frac{3\times 22.4}{6}=11.2L$ of HCl
Again at STP, 2 moles of $Al$ produces 3 moles or $3\times 22.4L$ of HCl
or 1 mole of $Al$ produces $\frac{3\times 22.4}{2}=33.6L$ of $HCl$