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Molar and Specific Heat Capacity

What will be ...

Question

What will be the amount of heat evolved by burning 10 L of methane under standard conditions?
(Given heats of formation of $C H_{4}, C O_{2}$ and $H_{2} O$ are -76.2, -398.8 and -241.6 kJ $m o l^{- 1}$ respectively)

A

805.8 kJ

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B

398.8 kJ

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C

359.7 kJ

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D

640.4 kJ

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Solution

The correct option is A 359.7 kJ
$C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$
$Δ H = H_{P} - H_{R}$
$= Δ H_{f} (C O_{2}) + 2 Δ H_{f} (H_{2} O) - [Δ_{f} (C H_{4}) + 2 Δ H_{f} (C O_{2})]$
$= - 398.8 - (2 \times 241.6) - (- 76.2 + 2 \times 0)$
$= - 805.8 k J$
$22.4 L o f C H_{4} (1 m o l e) g i v e s 805.8 k J$
$10 L o f C H_{4} w i l l g i v e \frac{805.8}{22.4} \times 10 = 359.73 k J$

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Similar questions

Q. What will be the amount of heat evolved by burning

10 L

of methane under standard conditions?
(Given heats of formation of

C H_{4}, C O_{2} a n d H_{2} O a r e - 76.2, - 398.8 a n d - 241.6 k J m o l^{- 1}

Q. The standard heat of formation of

C H_{4 (g)}, C O_{2 (g)}

H_{2} O_{(g)}

- 76.2, - 398.8, - 241.6

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respectively. the amount of heat evolved

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Q. The standard heats of formation of

{C H}_{4} (g), {C O}_{2} (g)

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respectively. Calculate the amount of heat evolved by burning

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Q. The standard heat of formation of

C H_{4 (g)}, C O_{2 (g)}

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- 76.2, - 398.8, - 241.6

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respectively. the amount of heat evolved

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C H_{4} (g), C O_{2} (g) a n d H_{2} O (g)

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