Adsorption of $\mathrm{N_2}$ on $\mathrm{TiO_2}$ was carried out at 75 K. A plot of $\frac{z}{(1-z)V}$ versus $z$ ($z = p/p^0$) gives a straight line with an intercept, $4.0 \times 10^{-6}\ \mathrm{mm^{-3}}$ and slope, $1.0 \times 10^{-3}\ \mathrm{mm^{-3}}$. The volume (rounded off to the nearest integer) corresponding to the monolayer coverage is:
(a)$555\ \mathrm{mm^3}$
(b)$690\ \mathrm{mm^3}$
(c)$785\ \mathrm{mm^3}$
(d)$996\ \mathrm{mm^3}$
Answer
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