For a gaseous reaction, the rate of reaction may be expressed in the units

Options

A. atm
B. atm s
C. atm/s
D. `atm//s^2`

Answer

To determine the units of the rate of reaction for a gaseous reaction, we can follow these steps:

### Step 1: Understand the Definition of Rate of Reaction
The rate of reaction is defined as the change in concentration of a reactant or product per unit time.

### Step 2: Identify the Units of Concentration
For gaseous reactions, concentration is typically expressed in terms of pressure. The common unit for pressure in this context is atmospheres (atm).

### Step 3: Identify the Units of Time
The standard unit of time used in kinetics is seconds (s).

### Step 4: Combine the Units
Now, we can combine the units of concentration and time to express the rate of reaction. Since concentration is in atmospheres and time is in seconds, the rate of reaction can be expressed as:

\[ \text{Rate of Reaction} = \frac{\text{Change in Concentration}}{\text{Change in Time}} = \frac{\text{atm}}{\text{s}} \]

### Step 5: Final Expression
Thus, the unit of the rate of reaction for a gaseous reaction is:

\[ \text{Rate of Reaction} = \text{atm/s} \]