Question

Write a balanced chemical equation for the following reaction: aluminum metal gets placed into a solution of hydrochloric acid and produces aqueous aluminum chloride and hydrogen gas.

A. 2Al(s) + 3HCl(aq) → 2AlCl3(aq) + 3H2(g)
B. 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g)
C. 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 6H2(g)
D. 2Al(s) + 6HCl(aq) → 2Al2Cl3(aq) + 3H2(g)

Answer 1

valency of Al=3
" " Cl=1
\[write~ H _{2} \]

Answer 2

B is the only equation that is balanced.