When 1 mole of butane burns at constant pressure and 100^°C,it produces 2658 kJ of heat and does
5 kJ of work.What are the values of ΔE and q for the combustion of 1 mole of butane?

Question

When 1 mole of butane burns at constant pressure and 100^°C,it produces 2658 kJ of heat and does 5 kJ of work.What are the values of ΔE and q for the combustion of 1 mole of butane?

Quizplus · Accepted Answer

ΔE = q + w
ΔE = -2658 kJ + (-5 kJ)    (since work done by the system is negative, as given in the problem)
ΔE = -2663 kJ

Since the combustion is exothermic (produces heat), q will be negative:
q = -2658 kJ

Therefore, the correct answer is A (-2653 kJ for ΔE and -2658 kJ for q).

When 1 Mole of Butane Burns at Constant Pressure and 100°C,it

When 1 Mole of Butane Burns at Constant Pressure and 100^°C,it