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.

Question

Quizplus · Accepted Answer

First, calculate the moles of acetylene: 0.338 g / 26.04 g/mol = 0.01298 mol. The energy released is 0.01298 mol * 2599 kJ/mol = 33.74 kJ = 33740 J. The total heat capacity of the system is the sum of the calorimeter and water: 729 J/K + (1150 g * 4.184 J/g.K) = 5480.6 J/K. The temperature increase is 33740 J / 5480.6 J/K = 6.16 K, which is closest to 6.09 K.

Acetylene,C2H2,is a Gas Used in Welding

Acetylene,C₂H₂,is a Gas Used in Welding