8.80 kJ를 흡수하는 알루미늄 시료의 질량(g)

8.80 kJ를 흡수하는 알루미늄 시료의 질량(g)

 

 

12.5℃에서 26.8℃로 가열될 때

8.80 kJ를 흡수하는 알루미늄(Al) 시료의 질량(g)

 

 

Calculate the mass, in grams, for each of the following:

> a sample of aluminum (Al) that absorbs 8.80 kJ when heated from 12.5 °C to 26.8 °C

 

 

[Table] Specific Heats (J/g•℃) of Some Substances

> Aluminum, Al(s): 0.897
> Copper, Cu(s): 0.385
> Gold, Au(s): 0.129
> Iron, Fe(s): 0.452
> Silver, Ag(s): 0.235
> Titanium, Ti(s): 0.523
> Ammonia, NH3(g): 2.04
> Ethanol, C2H5OH(l): 2.46
> Sodium chloride, NaCl(s): 0.864
> Water, H2O(l): 4.184
> Water, H2O(s): 2.03

 

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알루미늄의 비열 = 0.897 J/g•℃

 

 

q = C m Δt

( 식 설명 https://ywpop.tistory.com/2897 )

 

m = q / C Δt

= (8800 J) / [(0.897 J/g•℃) (26.8-12.5 ℃)]

= 686.05 g

 

 

답: 686 g