1. The problem statement, all variables and given/known data https://holland.pk/uptow/i4/1ca04ddf7c25f6c63e307720c34a4ff3.png 2. Relevant equations First principle of thermodynamics: E=q+w 3. The attempt at a solution E=q+w=-17+21=4kJ>0 ∴Endothermic (absorb heat from surrounding) (a) false (from surrounding to the system) (b) false (does work by surrounding) (c) true (d) true the answer states only option b is false... why option a is true? Thank you very much!