Given- Cgraphite-O2g- CO2g- rHo-393-5 kJ mol-1 H2g-1-2O2g- H2Ol- rHo-285-8 kJ mol-1 CO2g-2H2Ol- CH4g-2O2g- rHo-890-3 kJ mol-1Based on the above thermochemical equations- the value of - rHo at 298 K for the reaction Cgraphite-2H2g- CH4g will be-

The correct option is C 74.8 kJ mol^ 1 C_graphite+O_2(g)→ CO_2(g);Δ _rH^∘= 393.5 .....(1) H_2(g)+1/2O_2(g)→ H_2O(l);Δ _rH^∘= 285.8 .....(2) ...

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Given, Cgrap...

Question

Given,
$C_{(g r a p h i t e)} + O_{2} (g) \to C O_{2} (g); Δ_{r} H^{o} = - 393.5 k J m o l^{- 1}$
$H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l); Δ_{r} H^{o} = - 285.8 k J m o l^{- 1}$
$C O_{2} (g) + 2 H_{2} O (l) \to C H_{4} (g) + 2 O_{2} (g); Δ_{r} H^{o} = + 890.3 k J m o l^{- 1}$
Based on the above thermochemical equations, the value of $Δ_{r} H^{o}$ at $298 K$ for the reaction
$C_{(g r a p h i t e)} + 2 H_{2} (g) \to C H_{4} (g)$ will be:

+ 144.0 k J m o l^{- 1}

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- 74.8 k J m o l^{- 1}

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- 144.0 k J m o l^{- 1}

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+ 78.8 k J m o l^{- 1}

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C_{(g r a p h i t e} + O_{2} (g) \to C O_{2} (g); Δ_{r} H^{o} = - 393.5 k J m o l^{- 1}

H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l); Δ_{r} H^{o} = - 285.8 k J m o l^{- 1}

C O_{2} (g) + 2 H_{2} O (l) \to C H_{4} (g) + 2 O_{2} (g); Δ^{r} H 6 o = + 890.3 k J m o l^{- 1}

D e l t a_{r} H^{o}

298 K

C_{(g r a p h i t e)} + 2 H_{2} (g) \to C H_{4} (g)

C_{(g r a p h i t e s)} + O_{2} (g) \to C O_{2} (g)

Δ_{r} H^{\circ} = - 393.5 k J m o l^{- 1}

H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l);

Δ_{r} H^{\circ} = - 285.8 k J m o l^{- 2}

C O_{2} (g + 2 H_{2} O (l) \to C H_{4} (g) + 2 O_{2} (g)

Δ_{r} H^{\circ} = + 890.3 k J m o l^{- 1}

Δ_{r} H^{\circ}

C_{(g r a p h i t e)} + 2 H_{2} (g) \to C H_{4} (g)

C_{(g r a p h i t e)} + O_{2} (g) \to C O_{2} (g);

Δ_{f} H^{\circ} = - 393.5 k J m o l^{- 1}

H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l)

Δ_{f} H^{\circ} = - 285.8 k J m o l^{- 1}

C O_{2} (g) + 2 H_{2} O (l) \to C H_{4} (g) + 2 O_{2} (g)

Δ_{f} H^{\circ} = + 890.3 k J m o l^{- 1}

Δ_{f} H^{\circ}

C_{(g r a p h i t e)} + 2 H_{2} (g) \to C H_{4} (g)

C

+ O_{2} (g) \to C O_{2} (g)

Δ_{r} H^{o} = x k J m o l^{- 1}

C

+ \frac{1}{2} O_{2} (g) \to C O (g)

Δ_{r} H^{o} = y k J m o l^{- 1}

C O (g) + \frac{1}{2} O_{2} (g) \to C O_{2} (g)

Δ_{r} H^{o} = z k J m o l^{- 1}

C_{(g r a p h i t e s)} + O_{2} (g) \to C O_{2} (g)

Δ_{r} H^{\circ} = - 393.5 k J m o l^{- 1}

H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l);

Δ_{r} H^{\circ} = - 285.8 k J m o l^{- 2}

C O_{2} (g + 2 H_{2} O (l) \to C H_{4} (g) + 2 O_{2} (g)

Δ_{r} H^{\circ} = + 890.3 k J m o l^{- 1}

Δ_{r} H^{\circ}

C_{(g r a p h i t e)} + 2 H_{2} (g) \to C H_{4} (g)

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