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Physical and Chemical Properties of Hydrogen

for the combu...

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for the combustion of C3H8(g) at cons†an t temp △ H-△ U IS

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Q. For the combustion of

C_{3} H_{8} (g)

at constant temperature

Δ H - Δ U

Q. The enthalpy change for the reaction

C_{3} H_{8} (g) + H_{2} (g) \to C_{2} H_{6} (g) + C H_{4} (g)

25^{o}

is -55.7 kJ / mol . Calculate the enthalpy of combustion of

C_{2} H_{6} (g)

. The enthalpy of combustion of propane is

- 2220 k J m o l^{- 1}

and enthalpy of

H_{2}

C H_{4}

are -285.8 KJ/mol and -890 KJ/mol respectively.

Q. Find enthalpy change for the reaction:

C_{3} H_{8} (g) + H_{2} (g) \to C_{2} H_{6} (g) + C H_{4} (g)

25^{\circ} C

. The enthalpy of combustion of

H_{2}

C H_{4}

- 285.8

- 890.0 k J / m o l

Δ H_{c o m b (C_{2} H_{6}) (g)} = - 1560 k J / m o l

Δ H_{s u b (C) (s)} = 393.5 k J / m o l

Δ H_{f (C_{3} H_{8}) (g)} = - 103.8 k J / m o l

$C_{3} H_{8} (g) + 5 O_{2} (g) \to 3 C O_{2} (g) + 4 H_{2} O (l)$

The combustion of propane,

C_{3} H_{8} (g)

, proceeds according to the equation above. In the complete combustion of 44.0 grams of propane, determine how many grams of water will be formed.

Q. The heats of formation of

C O_{2} (g)

H_{2} O (l)

- 394 k J / m o l e

- 285.8 k J / m o l e

respectively. Using the data for the following combustion reaction, calculate the heat of formation of

C_{3} H_{8} (g)

.

C_{3} H_{8} (g) + 5 O_{2} (g) \to 4 H_{2} O (l)

Δ H^{\circ} = - 2221.6 k J

.

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