The osmotic pressure of a solution at $0°\mathrm{C}$ is $4 \mathrm{atm}$. What will be the osmotic pressure at $546 \mathrm{K}$ under similar condition?

${\text{A}}_{\text{(g)}}{\text{+2B}}_{\text{(g)}}\stackrel{}{\to }{\text{ 2C}}_{\text{(g)}}{\text{ + 3D}}_{\text{(g)}}$ 

For the above reaction, the value of $\text{Δ}$H is $19.0 \mathrm{Kcal}$ at ${27}^{°}\mathrm{C}$. The value of $\text{Δ}$U in $\mathrm{kcal}$ is ______.

(Given ${\text{R=2.0 cal K}}^{\text{-1}}{\text{ mol}}^{\text{-1}}$)