Limitations o...

Limitations of First Law

Trending Questions

Q. The heat of formation of

C_{2} H_{5} O H (l)

- 66 k c a l m o l^{- 1}

. The heat of combustion of

C H_{3} O C H_{3} (g)

- 348 k c a l m o l^{- 1}

△ H_{f}

for

H_{2} O

and

C O_{2}

are

- 68 k c a l m o l^{- 1}

and

- 94 k c a l m o l^{- 1}

respectively.
Then, the

△ H

for reaction

C_{2} H_{5} O H (l) \to C H_{3} O C H_{3} (g)

is :

$△ H = 18 k c a l m o l^{- 1}$
$△ H = 22 k c a l m o l^{- 1}$
$△ H = 26 k c a l m o l^{- 1}$
$△ H = 30 k c a l m o l^{- 1}$

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Standard enthalpy of combustion of $C H_{4}$ is $- 890 k J m o l^{- 1}$ and standard enthalpy of vaporisation of water is 40.5 kJ $m o l^{- 1}$ . Calculate the enthalpy change for the reaction :
$C H_{4 (g)} + 2 O_{2 (g)} \to C O_{2 (g)} + 2 H_{2} O_{(g)}$

$- 890 k J m o l^{- 1}$
$- 809 k J m o l^{- 1}$
$809 k J m o l^{- 1}$
$- 971 k J m o l^{- 1}$

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O_{(g)} + e^{-} \to O_{(g)}^{-} Δ H_{1}

O_{(g)}^{-} + e^{-} \to O_{(g)}^{- 2} Δ H_{2}

O_{2 (g)} \to O_{2 (g)}^{+} + e^{-} Δ H_{3}

O_{(g)} \to O_{(g)}^{+} + e^{-} Δ H_{4}

H_{2 (g)} \to H_{2 (g)}^{+} + e^{-} Δ H_{5}

H_{(g)} \to H_{(g)}^{+} + e^{-} Δ H_{6}

O_{(g)} + 2 e^{-} \to O^{- 2} Δ H_{7}

Which of the following option(s) is/are correct?

$| △ H_{1} | > | △ H_{2} |$
$| △ H_{4} | > | △ H_{3} |$
$| △ H_{5} | > | △ H_{6} |$
$| △ H_{7} |$ is +ve

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Q. The difference between heats of reaction at constant pressure and at constant volume for the reaction

2 C_{6} H_{6} (l) + 15 O_{2} (g) \to 12 C O_{2} (g) + 6 H_{2} O (l) a t 25^{\circ} C

at in kJ is

–7.43
+ 3.72
–3.72
+ 7.43

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