32. Two liters of N, at O'C and 5atm areexpanded exothermally against

1.	32. Two liters of N, at O'C and 5atm areexpanded exothermally against a constantexternal pressure of latm untill the pressureof gas reaches latm. Assuring gas to beideal. Calculate work of expansion1) 400 J 2) -810 J 3) -810 KJ 4) 600 KJplease answer me it's urgent
Answer» <P>EXPLANATION: Since the external pressure is greatly different from the pressure of N 2 and thus, the PROCESS is irreversible. w=−P ext (V 2 −V 1 ) w=−1×(V 2 −V 1 ) Given V 1 =2 litre V 2 =? T=273K P 1 =5atm P 2 =1atm ∴P 1 V 1 =P 2 V 2 ∴V 2 = 1 2×5 =10 litre ∴w=−1×(10−2)=−8 litre atm ∴=− 0.0821 8×1.987 calorie=− 0.0821 8×1.987×4.184 J=−810.10 JOULE

32. Two liters of N, at O'C and 5atm areexpanded exothermally against a constantexternal pressure of latm untill the pressureof gas reaches latm. Assuring gas to beideal. Calculate work of expansion1) 400 J 2) -810 J 3) -810 KJ 4) 600 KJplease answer me it's urgent

Answer»

Since the external pressure is greatly different from the pressure of

and thus, the PROCESS is irreversible.

w=−P

ext

−V

)

w=−1×(V

−V

)

Given V

=2 litre V

=? T=273K

=5atm P

=1atm

∴P

∴V

2×5

=10 litre

∴w=−1×(10−2)=−8 litre atm

∴=−

0.0821

8×1.987

calorie=−

0.0821

8×1.987×4.184

J=−810.10 JOULE