Acetylene,C₂H₂,is a Gas Used in Welding

question 56

Multiple Choice

Acetylene,C₂H₂,is a gas used in welding.The molar enthalpy of combustion for acetylene is -2599 kJ.A mass of 0.338 g C₂H₂(g) is combusted in a bomb calorimeter.If the heat capacity of the calorimeter is 729 J/K and it contains 1.150 kg of water,what is the temperature increase of the bomb calorimeter? The specific heat capacity of water is 4.184 J/g.K and the molar mass of acetylene is 26.04 g/mol.

• A) 1.59 K
• B) 6.09 K
• C) 7.01 K
• D) 12.3 K
• E) 18.0 K

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