Chemistry: First principle of thermodynamics

[yecko]

Homework Statement

https://holland.pk/uptow/i4/1ca04ddf7c25f6c63e307720c34a4ff3.png

Homework Equations

First principle of thermodynamics: E=q+w

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!

 

[Chestermiller]

q=-17 kJ means that heat flows from the system to the surroundings. So "a" is not false.

And why are you using E=q+w=-17+21=4kJ>0 to say that
∴Endothermic (absorb heat from surrounding)?

 

[yecko]

I see. thanks.

 

[mjc123]

It is impossible for only option B to be false. If B is false E is also false.

 

[DrClaude]

It is impossible for only option B to be false. If B is false E is also false.

Good catch.