ΔE = q + w. (a) q = 0.763 kJ, w = -840 J

ΔE = q + w. (a) q = 0.763 kJ, w = -840 J

 

 

Calculate ΔE and

determine whether the process is endothermic or exothermic.

 

(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.

 

---------------------------------------------------

 

(a)

ΔE = q + w

( 참고 https://ywpop.tistory.com/5134 )

 

= (+763 J) + (-840 J)

= -77 J

 

---> ΔE < 0 이므로, 발열(exothermic).

 

 

 

 

(b)

ΔE = q + w

= (-66.1 kJ) + (+44.0 kJ)

= -22.1 kJ

 

---> ΔE < 0 이므로, 발열(exothermic).

 

 

 

 

[키워드] Δeqw 기준문서