10.00 g NaCl 200.0 mL water 25.0℃ calorimeter 669 J absorbed
Sodium chloride is added in cooking to enhance the flavor of food.
When 10.00 g of NaCl are dissolved in 200.0 mL of water at 25.0°C
in a coffee-cup calorimeter, 669 J of heat are absorbed.
(You can make the following assumptions about the solution: volume = 200.0 mL, density = 1.00 g/mL, specific heat = 4.18 J/g•°C)
a) Is the solution process exothermic?
b) What is q_H2O?
c) What is the final temperature of the solution?
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a) Is the solution process exothermic?
---> No.
b) What is q_H2O?
q_H2O = -669 J
c) What is the final temperature of the solution?
q = C m Δt
( 참고 https://ywpop.tistory.com/2897 )
Δt = q / C m
= -669 / [(4.18) (200.0)]
= -0.800℃
Δt = 나중 온도 – 처음 온도 = -0.800℃
나중 온도 = (-0.800℃) + 25.0℃ = 24.2℃
[ 관련 예제 https://ywpop.tistory.com/14732 ] 5.00 g urea 250.0 mL water 30.0℃ calorimeter 27.6 kJ absorbed
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