Initial moles, n=443.6​Final moles, n′=443.6−0.6​=443.0​Since P and V are constant,n1​ T1​=n2​ T2​443.6​×T=443.0​×(T+15)T=75 KP=VnRT​=80.0818×75×0.0821​=0.063 atm