Write the rate equation for the reaction `2A + B to C` if the order of the reaction is zero .

Explanation

To write the rate equation for the reaction \(2A + B \to C\) given that it is a zero-order reaction, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reaction**: The reaction given is \(2A + B \to C\).

2. **Understand Zero-Order Reactions**: In a zero-order reaction, the rate of the reaction is constant and does not depend on the concentration of the reactants. This means that the rate remains the same regardless of how much of the reactants are present.

3. **Write the General Form of the Rate Equation**: The general form of the rate equation for a reaction can be expressed as:
\[ \text{Rate} = k[A]^m[B]^n \]
where \(k\) is the rate constant, and \(m\) and \(n\) are the orders of the reaction with respect to reactants A and B, respectively.

4. **Set the Orders to Zero**: Since the reaction is specified to be zero-order, we set \(m = 0\) and \(n = 0\):
\[ \text{Rate} = k[A]^0[B]^0 \]

5. **Simplify the Equation**: Any quantity raised to the power of zero equals 1. Therefore:
\[ \text{Rate} = k \cdot 1 \cdot 1 = k \]

6. **Final Rate Equation**: The final rate equation for the reaction is:
\[ \text{Rate} = k \]
where \(k\) is the rate constant.

### Summary:
The rate equation for the reaction \(2A + B \to C\) when it is a zero-order reaction is simply:
\[ \text{Rate} = k \]