# What is the pressure of HCl gas at $-40^{\large\circ}C$ if its density is $8.0 kgm^{-3}? (R = 8.314 JK^{-1}mol^{-1})$
$(a)\;424.58\times10^2 Pa\qquad(b)\;424.58\times10^4 Pa\qquad(c)\;424.58\times10^5 Pa\qquad(d)\;424.58\times10^3 Pa$