Question

this formula equation is unbalanced. p₄(s) + 6cl₂(g) → pcl₃(l) which coefficient should be placed in front of pcl₃ to balance this equation? 1 2 4 6

Explanation:

Step1: Count P atoms on left - hand side

On the left - hand side of the equation $P_4(s)+6Cl_2(g)
ightarrow PCl_3(l)$, there are 4 P atoms in $P_4$.

Step2: Balance P atoms

To balance the P atoms, we need 4 moles of $PCl_3$ on the right - hand side since each $PCl_3$ has 1 P atom. So the coefficient of $PCl_3$ should be 4, giving the balanced equation $P_4(s)+6Cl_2(g)
ightarrow4PCl_3(l)$.

Answer:

C. 4