Given iCgraphite - O2g- CO2g- r H- - x KJ mol-1iiCgraphite - 12O2g- COg- r H- - y KJ mol-1iii COg - 12O2g- CO2g- r H- - zKJ mol-1Based on the above thermochemical equations- find out which one of the following algebraic relationships is correct-

(i) C_(graphite) + O_2(g)→ CO_2(g) (ii) C_(graphite) + 12O_2(g)→ CO_(g) (iii) CO_(g) + 12O_2(g)→ CO_2(g) On analysis the three given reaction we can see that ...

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Byju's Answer

Standard XII

Chemistry

Law of Mass Action

Given iCgraph...

Question

Given
$(i) C_{(g r a p h i t e)} + O_{2 (g)} \to C O_{2 (g)}; △_{r} H^{\circ} = x K J m o l^{- 1} (i i) C_{(g r a p h i t e)} + \frac{1}{2} O_{2 (g)} \to C O_{(g)}; △_{r} H^{\circ} = y K J m o l^{- 1} (i i i) C O_{(g)} + \frac{1}{2} O_{2 (g)} \to C O_{2 (g)}; △_{r} H^{\circ} = z K J m o l^{- 1}$
Based on the above thermochemical equations, find out which one of the following algebraic relationships is correct?

z = x + y

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x = y - z

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x = y + z

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y = 2 z - x

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Solution

The correct option is C $x = y + z$
$(i) C_{(g r a p h i t e)} + O_{2 (g)} \to C O_{2 (g)} (i i) C_{(g r a p h i t e)} + \frac{1}{2} O_{2 (g)} \to C O_{(g)} (i i i) C O_{(g)} + \frac{1}{2} O_{2 (g)} \to C O_{2 (g)}$
On analysis the three given reaction we can see that
by adding (ii) and (iii) we get (i)
(ii) + (iii) = (i)
Thus, the enthalpy of the reaction follows the same.
Addition of enthalpy of (ii) and (iii) will give enthalpy of reaction (i).
$∴$ y + z = x
$C (graphite) + O_{2 (g)} \to C O_{2 (g)}, i . e ., x = y + z$

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Similar questions

Q. Given that:
(i)

C

(graphite)

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

;

Δ_{r} H^{o} = x k J m o l^{- 1}

.
(ii)

C

(graphite)

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

;

Δ_{r} H^{o} = y k J m o l^{- 1}

(iii)

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}

Based on the given thermochemical equations, find out which one of the following algebraic relationships is correct?

Q. Given that:

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

C (g r a p h i t e) + \frac{1}{2} O_{2} (g) \to C O (g), Δ H = y k J m o l^{- 1}

C O (g) + \frac{1}{2} O_{2} (g) \to C O_{2} (g), Δ H = z k J m o l^{- 1}

Based on the given thermochemical equations, find out which one of the following algebric relationships is correct?

Q. Given that:

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

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

C O (g) + \frac{1}{2} O_{2} (g) \to C O_{2} (g) Δ H = z k J m o l^{- 1}

Based on the given thermochemical equations, find out which one of the following algebric relationships is correct?

Q. Given

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}

Based on the above thermochemical equations, the value of

Δ_{f} H^{\circ}

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:

From the following data of heats of combustion, find the heat of formation of

C H_{3} O H (l)

C H_{3} O H (l) + \frac{3}{2} O_{2} (g) \to C O_{2} (g) + 2 H_{2} O (l); △_{r} H^{⊖} = - 726 k J

C (s) + O_{2} (g) \to C O_{2} (g), Δ H = - 394 k J

H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l), Δ H = - 286 k J

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Given (i)C(graphite)+O2(g)→CO2(g);△rH∘=xKJmol−1(ii)C(graphite)+12O2(g)→CO(g);△rH∘=yKJmol−1(iii)CO(g)+12O2(g)→CO2(g);△rH∘=zKJmol−1 Based on the above thermochemical equations, find out which one of the following algebraic relationships is correct?