Based on the following thermochemical equations H2O(g) + C (s) → CO(g) + H2 (g); Δ H= 131 kJ CO(g) + 1/2 O2(g)→ CO2(g); Δ H= -2 82 kJ H2(g) + 1/2 O2(g)→ H2O(g); Δ H= - 242 kJ C(s) + O2(g)→ CO2(g); Δ H=X kJ The value of X will be

Question

Based on the following thermochemical equations H2O(g) + C (s) → CO(g) + H2 (g); Δ H= 131 kJ CO(g) + 1/2 O2(g)→ CO2(g); Δ H= -2 82 kJ H2(g) + 1/2 O2(g)→ H2O(g); Δ H= - 242 kJ C(s) + O2(g)→ CO2(g); Δ H=X kJ The value of X will be (A) -393 kJ (B) -655 kJ (C) +393 kJ (D) +655 kJ

Tardigrade Admin · Accepted Answer

The reaction C(s) + O2(g)→ CO2(g) is the result of the addition of the given three reactions ∴ Δ H = X= 131 + (-282) + (-242) = -393 kJ

$- 393 k J$

$- 655 k J$

$+ 393 k J$

$+ 655 k J$

The reaction $C (s) + O_{2} (g) \to C O_{2} (g)$
is the result of the addition of the given three reactions
$∴ Δ H = X = 131 + (- 282) + (- 242)$
$= - 393 k J$

Q. Based on the following thermochemical equations H2​O(g)+C(s)→CO(g)+H2​(g);ΔH=131kJ CO(g)+1/2O2​(g)→CO2​(g);ΔH=−282kJ H2​(g)+1/2O2​(g)→H2​O(g);ΔH=−242kJ C(s)+O2​(g)→CO2​(g);ΔH=XkJ The value of X will be

−393kJ

−655kJ

+393kJ

+655kJ

The reaction C(s)+O2​(g)→CO2​(g) is the result of the addition of the given three reactions ∴ΔH=X=131+(−282)+(−242) =−393kJ

$- 393 k J$

$- 655 k J$

$+ 393 k J$

$+ 655 k J$

The reaction $C (s) + O_{2} (g) \to C O_{2} (g)$
is the result of the addition of the given three reactions
$∴ Δ H = X = 131 + (- 282) + (- 242)$
$= - 393 k J$