Express the rate of the following reactions:
(a) `PCl_(5) rarr PCl_(3) + Cl_(2)`
(b) `2NO_(2) rarr 2NO + O_(2)`
in terms of the concentrations of reactants and Products.

Explanation

To express the rate of the given reactions in terms of the concentrations of reactants and products, we will follow a systematic approach for each reaction.

### (a) Reaction: \( PCl_5 \rightarrow PCl_3 + Cl_2 \)

1. **Identify the change in concentration**:
- As the reaction proceeds, the concentration of \( PCl_5 \) decreases, while the concentrations of \( PCl_3 \) and \( Cl_2 \) increase.

2. **Express the rate in terms of reactants and products**:
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