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일반화학/[05장] 열화학

298 K 1 atm Ba 2.740 g BaO 11.14 kJ ΔH°_f

by 영원파란 2022. 5. 26.

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298 K 1 atm Ba 2.740 g BaO 11.14 kJ ΔH°_f

 

 

When 2.740 g of Ba reacts with O2 at 298 K and 1 atm

to form BaO, 11.14 kJ of heat are released.

What is ΔH°_f for BaO?

 

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

 

2.740 g / (137.33 g/mol) = 0.01995 mol Ba

( 참고 https://ywpop.tistory.com/7738 )

 

 

 

Ba(s) + 1/2 O2(g) → BaO(s)

 

Ba : BaO = 1 : 1 계수비(= 몰수비) 이므로,

생성된 BaO의 몰수 = 0.01995 mol

 

 

 

–11.14 kJ / 0.01995 mol

= –558.4 kJ/mol

( –는 방출열을 의미. )

 

 

 

답: ΔH°_f(BaO,s) = –558.4 kJ/mol

 

 

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