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일반화학/[05장] 열화학

125 g water 283 g 3.0℃ 91.0℃

by 영원파란 2023. 6. 16.

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125 g water 283 g 3.0℃ 91.0℃

 

 

A 125 g sample of cold water and

a 283 g sample of hot water are mixed

in an insulated thermos bottle and allowed to equilibrate.

If the initial temperature of the cold water is 3.0℃,

and the initial temperature of the hot water is 91.0℃,

what will be the final temperature?

 

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▶ 참고: 열용량과 비열

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

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q = C m Δt

 

고온 물질이 잃은 열(–q) = 저온 물질이 얻은 열(+q)

 

같은 물질 = 같은 비열(C)

---> C 소거(생략)

 

 

 

final temperature = x 라 두면,

–[(283 g) (x – 91.0 ℃)] = +[(125 g) (x – 3.0 ℃)]

 

–283x + 25753 = 125x – 375

 

(125 + 283)x = (25753 + 375)

 

x = (25753 + 375) / (125 + 283)

= 64.04℃

 

 

 

답: 64.0℃

 

 

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