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. $11.2$ L of $H_2\left(g\right)$ at STP is produced for every mol of $HCl$ (aq) consumed.
• B. $6$ L of $HCl$ (aq) is consumed for every $3$ L of $H_2\left(g\right)$ produced.
• C. $33.6$ L of $H_2\left(g\right)$ is produced regardless of temperature and pressure for every mol of $Al$ that reacts.
• D. $67.2$ L of $H_2\left(g\right)$ at STP is produced for every mole of $Al$ that reacts.

Answer 1

The correct option is A $11.2$ L of $H_2\left(g\right)$ at STP is produced for every mol of $HCl$ (aq) consumed.

As the reaction suggests that
for 6 mol $HC$l , 3 mol of $H_2$ gas is produced
At STP 1 mol of every gas has 22.4 L
so 1 mol ( 22.4 L) , will produce $3/6\ast 22.4=1/2\ast 22.4=11.2$ L of $H_2$ gas.