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Calorimetry

The combustio...

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The combustion enthalpies of carbon, hydrogen, and methane are -395.5 kJ mol^{-1}, -284.8 kJ mol^{-1} and -890.4 kJ mol^{-1} respectively at 25^0C. The value of s†an dard formation enthalpies of methane at that temperature is (1) 890.4 kJ mol^{-1} (2)-298.8 kJ mol^{-1} (3) -74.7 kJ mol^{-1} (4) -107.7 kJ mol^{-1}

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The enthalpy of combustion of methane, graphite and dihydrogen at 298 K are, $- 890.3 k J m o l^{- 1} - 393.5 k J m o l^{- 1}$ , and $- 285.8 k J m o l^{- 1}$ respectively. Enthalpy of formation of $C H_{4 (g)}$ will be
(i) $- 74.8 k J m o l^{- 1}$
(ii) $- 52.27 k J m o l^{- 1}$
(iii) $+ 74.8 k J m o l^{- 1}$
(iv) $+ 52.26 k J m o l^{- 1}$

Q. The enthalpy of combustion of methane, graphite and dihydrogen at

298 K

- 890.3

k J {m o l}^{- 1}, - 393.5

k J {m o l}^{- 1}, - 285.8

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

respectively. Enthalpy of formation of

{C H}_{4 (g)}

Q. The combustion enthalpies of carbon, hydrogen and ethyne are

- 393.5 k J m o l^{- 1},

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

- 1309.5 k J m o l^{- 1}

respectively at

25^{o} C

The value of standard enthalpy of formation of acetylene at this temperature is:

Q. The enthalpy of combustion of methane graphite and dihydrogen at

298 K

- 890.3

m o l^{- 1}

- 285.8

m o l^{- 1}

respectively. Enthalpy of formation of

C H_{4} (g)

Q. The standard enthalpies of combustion of

C_{6} H_{6} (l),

C_{(g r a p h i t e)}

H_{2} (g)

are respectively

- 3270

k J

{m o l}^{- 1},

- 394

k J

{m o l}^{- 1}

- 286

k J

{m o l}^{- 1}

. What is the standard enthalpy of formation of

C_{6} H_{6} (l)

k J

{m o l}^{- 1}

?

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