Question

hester, treyvon
dtal - ch - term 1 - unit 5a assessment 25 - 26
__ca(no₃)₂ + _? h₃po₄ → ca₃(po₄)₂ + hno₃
when this equation is balanced, the coefficient in front of h₃po₄ is -
○ 1
○ 2
○ 3
○ 4

Explanation:

Step1: Balance Ca atoms

$$3Ca(NO_3)_2+?H_3PO_4 ightarrow Ca_3(PO_4)_2+?HNO_3$$

Step2: Balance $PO_4$ groups

$$3Ca(NO_3)_2 + 2H_3PO_4 ightarrow Ca_3(PO_4)_2+?HNO_3$$

Step3: Balance $NO_3$ and H atoms

$$3Ca(NO_3)_2+2H_3PO_4 ightarrow Ca_3(PO_4)_2 + 6HNO_3$$

Answer:

B. 2