Split_00052 - 9.38 (cont'd) c. 1 kg coal contains 45.23 mol...

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9- 52 c. 1 kg coal contains 45.23 mol C and 35.77 mol H 1 kg coal + nO CO mol H O (l) kJ = 45.23( ( ( ( k J / k g 22 2 f o CO f o HO ( l ) f o coal f o coal ⇒→ + =− + ⇒= 4523 3577 2 21 400 3577 2 1510 .( . / ) ± , ± )( . / ) ± ) ± ) ± ) ΔΔ Δ Δ Δ HH H H H r o 20 1 02 3 0 4 References : C(s), O (g), H (g), ash(s) at 25 C ˆˆ Substance (mol) (mol) (kJ/mol) (kJ/mol) ˆ CO 6.14 ˆ CO 51.37 ˆ H 51.37 H O 33.58 0.06 Coal 1 kg 1510 kJ/kg Ash in out in out nn nH Hn H −−− −− + 5 ˆ (slag) (in coal) 0 0.266 kg (kJ/kg) H o 1 2 2 32 4 2 5m a s h (2500 25), 1,3 ˆ 393.5 0.0508(2475) 267.8 kJ/mol CO ˆ 110.52 0.0332(2475)
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