The osmotic pressure ($\pi$) of a polymer sample at different concentrations ($c$) was measured at $T(K)$. A plot of $(\pi/c)$ versus c gave a straight line with slope ($m$) and intercept ($c'$). The number average molecular weight of the ploymer is ($R=$ gas constant).
(a)$\dfrac{RT}{c'}$
(b)$\frac{c^{\prime}}{R T}$
(c)RT
(d)mRT
Answer
Answer: A ✓ checked by 4AB · confidence high
The source book printed B; on checking, A is correct — see the explanation.
Explanation
π/c = RT/Mₙ + (RT·B)c, so the intercept c′ = RT/Mₙ and Mₙ = RT/c′ (a).