Answer : The value of q, w and ΔE in kilojoule are -67.7 kJ, 27.05 kJ and -40.65 kJ respectively.
Explanation :
Formula used :
where,
Q = heat at constant pressure = ?
= change in enthalpy energy
n = number of moles of helium gas = 78.25 mol
Molar mass of He = 4 g/mole
= heat capacity at constant pressure =
= change in temperature =
Now put all the given values in the above formula, we get:
Now we have to calculate the work done.
Formula used :
where,
w = work done
p = pressure of the gas = 1 atm
= initial volume = 1910 L
= final volume = 1643 L
Now put all the given values in the above formula, we get:
conversion used : (1 L.atm = 101.3 J)
Now we have to calculate the value of of the gas.
Therefore, the value of of the gas is -40.65 kJ.