# What mass of calcium chromate is formed when 35 grams of calcium nitrate reacts with sodium carbonate?

This reaction cannot occur. In order for one of the products to be calcium chromate, one of the reactants would have to contain the chromate ion, $\text{CrO"^(2-)}$.
$\text{Ca(NO"_3)_2" + Na"_2"CO"_3}$$\rightarrow$$\text{2NaNO"_3" + CaCO"_3}$