Question

7.) ammonium carbonate (1 point)
○ $(nh_4)_2c$
○ $al_4c_3$
○ $al_2(co_3)_3$
○ $(nh_4)_2co_3$

Explanation:

Ammonium is the cation $\text{NH}_4^+$ with a +1 charge, and carbonate is the anion $\text{CO}_3^{2-}$ with a -2 charge. To form a neutral ionic compound, two ammonium ions are needed to balance the -2 charge of one carbonate ion, resulting in the formula $\text{(NH}_4\text{)}_2\text{CO}_3$. The other options do not match the combination of ammonium and carbonate ions.

Answer:

$\boldsymbol{(NH_4)_2CO_3}$