A bomb calorimeter has a heat capacity of 2.47 kJ/K including the water. When a 0.111 g sample of ethylene (C 2H 4) was burned in this calorimeter, the temperature increased by 2.26 K. Calculate the energy of combustion for one mole of ethylene. a. -50.3 kJ/mol b. -1.41 x 103 kJ/mol c. -0.274 kJ/mol d. -624 kJ/mol e. -5.29 kJ/mol

Answer : The correct option is, (b)

Explanation :

First we have to calculate the heat produced.

where,

q = heat produced = ?

c = specific heat capacity =

= Change in temperature = 2.26 K

Now put all the given values in the above formula, we get:

Now we have to calculate the energy of combustion for one mole of ethylene.

where,

= energy of combustion for one mole of ethylene = ?

q = heat released = 5.5822 kJ

m = mass of = 0.111 g

Molar mass of = 28 g/mol

Now put all the given values in the above formula, we get:

Negative sign indicate the energy is released.

Therefore, the energy of combustion for one mole of ethylene is,

it is the most commonly accepted one

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