Question

1. p4 + br2 → pbr3

Explanation:

Step1: Balance the phosphorus atoms

There are 4 phosphorus atoms in \(P_4\). So, we put a coefficient of 4 in front of \(PBr_3\) to balance the phosphorus atoms.

$$P_4+\text{__}Br_2 ightarrow4PBr_3$$

Step2: Balance the bromine atoms

In \(4PBr_3\), there are \(4\times3 = 12\) bromine atoms. Since each \(Br_2\) molecule has 2 bromine atoms, we need \(12\div2=6\) \(Br_2\) molecules.

$$P_4 + 6Br_2 ightarrow4PBr_3$$

Answer:

\(1\) \(P_4+6\) \(Br_2
ightarrow4\) \(PBr_3\)