Answer:
3 Ca(s) + 2 Al(NO₃)₃(aq) ⇒ 3 Ca(NO₃)₂(aq) + 2 Al(s)
Step-by-step explanation:
Let's consider the single displacement reaction between solid calcium metal and aqueous aluminum nitrate. The unbalanced chemical equation is:
Ca(s) + Al(NO₃)₃(aq) ⇒ Ca(NO₃)₂(aq) + Al(s)
We have 3 nitrates on the left and 2 nitrates on the right, so we will multiply Al(NO₃)₃(aq) and Ca(NO₃)₂(aq) by 2 and 3, respectively, to balance them.
Ca(s) + 2 Al(NO₃)₃(aq) ⇒ 3 Ca(NO₃)₂(aq) + Al(s)
Finally, we have to add coefficients before Ca(s) and Al(s) to balance the equation.
3 Ca(s) + 2 Al(NO₃)₃(aq) ⇒ 3 Ca(NO₃)₂(aq) + 2 Al(s)