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Question: a bomb calorimeter is filled with 84 atm of an...

Question details

A bomb calorimeter is filled with 8.4 atm of an unknown gaseous hydrocarbon fuel and an excess of oxygen gas at a temperature of 23.9 °C. The bomb calorimeter has a volume of 1.4 L and a heat capacity of 8.58 kJ/K. After the combustion reaction is complete the final temperature of the calorimeter is found to be 74.0 °C. Answer the following questions based on this information.

(a) What amount of heat in kJ was released from the combustion reaction of the unknown fuel? Please give your answer to 2 decimal places.

kJ



(b) What is the molar heat of combustion for the reaction in kJ/mol? Please give your answer to 2 decimal places.

(kJ/mol)



(c) Given the table of data below, what is the identity of the unknown gas?

Fuel Chemical Formula Molar Heat of Combustion
ethene CH2CH2 -1324.1 kJ/mol
methane CH4 -890.4 kJ/mol
ethyne HCCH -1309.5 kJ/mol
hydrogen H2 -285.9 kJ/mol



The identity of the unknown gas is ( ethene, methane ,ethyne, hydrogen)



(d) What is the heat of combustion for the reaction in kJ/g? Please give your answer to 2 decimal places.

kJ/g

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