Chapter 4, Problem 20E

How many kilograms of ${\text{HNO}}_{\text{2}}$ are consumed to produce 125 kg $\text{Ca}{\left({\text{H}}_{\text{2}}{\text{PO}}_{\text{4}}\right)}_{\text{2}}\text{+ Ca}{\left({\text{NO}}_{\text{3}}\right)}_{\text{2}}$ in this reaction?
${\text{Ca}}_{\text{3}}\left({\text{PO}}_{\text{4}}\right){\text{+ HNO}}_{\text{3}}\to \text{Ca}{\left({\text{H}}_{\text{2}}{\text{PO}}_{\text{4}}\right)}_{\text{2}}\text{+ Ca}{\left({\text{NO}}_{\text{3}}\right)}_{\text{2}}$ (not balanced)