A closed gas system undergoes the two-step pathway shown below (values are from the…
CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics
Problem
A closed gas system undergoes the two-step pathway shown below (values are from the system’s perspective).
Step | q (J) | w (J)
1 | +300 | 0
2 | −100 | −350
Which statement about the overall energy change after both steps is correct?
(a) The system’s internal energy increases by 200 J; the overall process is endothermic.
(b) The system’s internal energy decreases by 150 J; the overall process is exothermic.
(c) The system’s internal energy decreases by 150 J; the overall process is endothermic.
(d) The system’s internal energy increases by 550 J; the overall process is endothermic.