3 moles of an ideal gas is heated and compressed simultaneously from 300 K, 1 $\mathrm{atm}$ to 400 KP atm. If change in entropy of gas is $-3.3\mathrm{cal}/\mathrm{K}$ then calculate value of P (in $\mathrm{atm}$).

$C_p=\frac{7R}{2},R=2\mathrm{cal}/\mathrm{mole}-\mathrm{K}$

$[\ln 2=0.7,\ln 3=1.1,\ln 5=1.6]$