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Thermal Decomposition of Alkanes

The heat of c...

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The heat of combustion of CH4(g),graphite and H2(g) are 20 kcal,-40 kcal and-10 kcal respectively. The heat of formationof methane is

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Q. The standard heat of combustion of

C_{2} H_{2} (g),

C

H_{2} (g)

- 310 kcal

- 94 kcal

- 98 kcal

respectively. The heat of formation of

C_{2} H_{2} (g)

Q. Calculate the enthalpy change accompaning the conversion of

10 g

of graphite into diamond if the heats of combustion of

C (g r a p h i t e)

C (d i a m o n d)

- 94.05 k c a l

- 94.50 k c a l

Q. In the combustion of 4 g of methane, 2.5 kcal of heat is liberated. The heat of combustion of methane is

Q. Heats of combustion of methane, carbon and hydrogen are 212, 94, 68 kcal mol

^{- 1}

The heat of formation of

{C H}_{4}

C (s) + O_{2} (g) \to C O_{2} (g) Δ H = + 94.2 k c a l

H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l) + 68.3 Δ H = k c a l

C H_{4} (g) + 2 O_{2} (g) \to C O_{2} (g) + 2 H_{2} O (l) Δ H = + 210.8 k c a l

The heat of formation of methane in

k c a l

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