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For a certain gas which deviates a little from ideal behaviour, the values of density, *p*were measured atdifferent values of pressure, P. The plot of Pip on the Y–axis versus P on the X–axis was nonlinear and had an intercept on the Y–axis, which was equal to

(1) $\frac{\text{RT}}{\text{M}}$

(2) $\frac{\text{M}}{\text{RT}}$

(3) RT

(4) $\frac{\text{RT}}{\text{V}}$

Where M = molar mass.