The relation between pressure exerted by an ideal gas (pideal) and observed pressure (preal) is given by the equation,
`p_("ideal") = p_("real") + (an^(2))/(V^(2))`
If pressure is taken in `Nm^(-2)`, number of moles in mol and volume in `m_(3)`, calculate the unit of ' a '.

Explanation

To find the unit of the constant 'a' in the equation \( p_{\text{ideal}} = p_{\text{real}} + \frac{a n^2}{V^2} \), we will rearrange the equation and analyze the units step by step.

### Step 1: Rearranging the Equation
We start with the equation:
\[ p_{\text{ideal}} = p_{\text{real}} + \frac{a n^2}{V^2} \]
To isolate \( a \), we can rearrange the equation as follows:
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