Solution
The reaction is an exothermic
reaction. Heat is given off.
The calibration factor of the calorimeter is given by the expression below.
Obtain the amount of energy released from 0.02134 grams of ethene burnt in oxygen according the equation below
Calibration factor X change in temperature = 759.6 X 1.42 = 1.078KJ
The enthalpy change is energy/mol
SO!
Step 1) Mole of ethene added = 0.02134 /28 = 0.00076 mole
Step 2) Divide the amount of energy by the number of mole of ethene.
1.078 / 0.00076 = 1418.42Kj/mol
Note how the enthalpy change has a negative sign. This indicates an exothermic reaction (heat given out).
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Simple calorimetry Specific heat of water 4.18J/g/C° 
We can use
the specific heat of water to make calculations on energy change during
chemical reactions. Water has a specific heat capacity of 4.18J/g/C°.
This means that 4.18 joules of energy must be supplied to every gram of
water to raise the temperature by 1 degree Celsius.

Look at the experiment above and calculate the amount of energy, in joules per gram of jelly bean. Step 1. Calculate the mass
loss of the jelly bean. This is the amount that was burnt to release its
energy. Step 2 Calculate the temperature rise initial final = 28  23 =5°C Step 3 calculate the amount
of energy released Step 4 calculate the amount
of energy per gram released by the jelly bean 