나프탈렌 연소열. C10H8 40.18 kJ/g 2.50 g 21.50℃ 28.83℃

나프탈렌 연소열. C10H8 40.18 kJ/g 2.50 g 21.50℃ 28.83℃

 

 

Under constant-volume conditions, the heat of combustion

of naphthalene (C10H8) is 40.18 kJ/g.

A 2.50 g sample of naphthalene is burned in a bomb calorimeter.

The temperature of the calorimeter increases from 21.50 to 28.83℃.

a) What is the total heat capacity of the calorimeter?

b) A 1.50 g sample of a new organic substance

is combusted in the same calorimeter.

The temperature of the calorimeter increases from 21.14 to 25.08℃.

What is the heat of combustion per gram of the new substance?

c) Suppose that in changing samples, a portion of the water

in the calorimeter were lost. In what way, if any,

would this change the heat capacity of the calorimeter?

 

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▶ 참고: 열용량과 비열

[ https://ywpop.tistory.com/2897 ]

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a)

q = (40.18 kJ/g) × 2.50 g = 100.45 kJ

 

 

C = q / Δt

= 100.45 kJ / (28.83 – 21.50 ℃)

= 13.704 kJ/℃

 

 

 

b)

q = C Δt

= (13.704 kJ/℃) (25.08 – 21.14 ℃)

= 53.994 kJ

 

 

53.994 kJ / 1.50 g

= 35.996 kJ/g

 

 

 

c)

달라진다.

 

왜냐하면, 연소열을

통과 물이 나눠 흡수하기 때문이다.

( 참고 https://ywpop.tistory.com/8471 )

 

 

 

 

[키워드] 나프탈렌의 연소열 기준문서, C10H8의 연소열 기준문서