Based on the following reactions C(graphite) + O 2 ( g ) → C O 2 ( g ) ; Δ H = - 394 KJ/mol …(i) 2 C O ( g ) + O 2 ( g ) → 2 C O 2 ( g ) ; Δ H = - 569 KJ/mol …(ii) The heat of formation of CO will be

Question

Based on the following reactions C(graphite) + O 2 ( g ) → C O 2 ( g ) ; Δ H = - 394 KJ/mol …(i) 2 C O ( g ) + O 2 ( g ) → 2 C O 2 ( g ) ; Δ H = - 569 KJ/mol …(ii) The heat of formation of CO will be, +109.5 kJ, +219 kJ, -109.5 KJ, -219 KJ

MARKS App · Accepted Answer

E C + E O 2 → E C O 2 + 394 E C O 2 = - 394 2 E C O + E O 2 → 2 E C O 2 + 569 2 E C O = 2 E C O 2 + 569 = 2 E C O 2 + 569 = 2 × - 394 + 569 = - 219 ∴ E CO = − 109 .5 kJ

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