5.00 g urea 250.0 mL water 30.0℃ calorimeter 27.6 kJ absorbed
Urea, (NH2)2CO, is used in the manufacture of resins and glues.
When 5.00 g of urea is dissolved in 250.0 mL of water (d = 1.00 g/mL)
at 30.0℃ in a coffee-cup calorimeter, 27.6 kJ of heat is absorbed.
a) Is the solution process exothermic?
b) What is q_H2O?
c) What is the final temperature of the solution?
(Specific heat of the water is 4.18 J/g•℃)
---------------------------------------------------
a) Is the solution process exothermic?
---> No.
b) What is q_H2O?
q_H2O = -27.6 kJ
c) What is the final temperature of the solution?
(Specific heat of the water is 4.18 J/g•℃)
q = C m Δt
( 참고 https://ywpop.tistory.com/2897 )
Δt = q / C m
= -27600 / [(4.18) (250.0)]
= -26.4℃
Δt = 나중 온도 – 처음 온도 = -26.4℃
나중 온도 = (-26.4℃) + 30.0℃ = 3.6℃
[ 관련 예제 https://ywpop.tistory.com/14733 ] 10.00 g NaCl 200.0 mL water 25.0℃ calorimeter 669 J absorbed
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