Question

Calculate E and determine whether the process is endothermic or exothermic for the following cases:

(a) q = 0.763 kJ and w = -840 J.
(b) A system releases 66.1 kJ of heat to its surroundings while the surroundings do 44.0 kJ of work on the system.

Answer 1

Answer: a) E= -0.077KJ Exothermic

b) E= -22.1KJ Exothermic

Step-by-step explanation:

a) change internal energy E = q+ w

Since q= 0.763KJ and w=-840j= -0.84KJ

E= 0.763kj - 0.84kj

E= -0.077KJ

The process is exothermic since it releases heat to the surrounding i.e E is negative.

b) q= - 66.1KJ negative because it's heat released to the surrounding

w= 44.0KJ work done on the system by the surrounding.

E= q+w

E= -66.1KJ + 44.0KJ

E= -22.1KJ

The process is exothermic because the value of E is negative.

Goodluck...