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일반화학/[05장] 열화학

500.0 g iron 10.0℃ water 400.0 g 90.0℃

by 영원파란 2022. 4. 10.

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500.0 g iron 10.0℃ water 400.0 g 90.0℃

 

 

A 500.0 g piece of iron is heated in a flame

and dropped into 400.0 g of water at 10.0℃.

The temperature of the water rises to 90.0℃.

How hot was the iron when it was removed from the flame?

(The specific heat of iron is 0.473 J/g•℃)

 

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

 

q = C m Δt

( 참고 https://ywpop.tistory.com/2897 )

 

 

 

철의 처음 온도를 x 라 두면,

 

고온 물질이 잃은 열(–q) = 저온 물질이 얻은 열(+q)

–(0.473 J/g•℃) (500.0 g) (90.0 – x ℃)

= +(4.184 J/g•℃) (400.0 g) (90.0 – 10.0 ℃)

 

–21285 + 236.5x = 133888

 

x = (133888 + 21285) / 236.5 = 656.1

 

 

 

답: 656℃

 

 

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