Question

A balloon filled with 39.1 moles of helium has a volume of 876 L at 0.0°C and 1.00 atm pressure. The temperature of the balloon is increased to 38.0°C as it expands to a volume of 998 L, the pressure remaining constant. Calculate the ∆E. (Molar heat capacity of He is 20.8 J/mol °C). 

a. 111 kJ

b. 18.5 kJ

c. - 4.64 kJ

d. 43.3 kJ

Answer 1

b) 18.5 kJ