Question

A 1.25g sample of octane (C H18) is burnt in excess of oxygen in a bomb
calorimeter. The temperature of the calorimeter rises from 294.05 to 300.78K.
If heat capacity of the calorimeter is 8.93 kJ K". Find the heat transferred to
calorimeter.​

Answer 1

Explanation:

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Answer 2

Answer:

Mass of octane, m = 1.25g or 0.00125kg

Heat capacity, C = 8.93kJK

Change in temperature ∆T = 300.78 - 294.05 = 6.73K

Heat transferred, Q = m C∆T

= 0.00125 × 8.93 × 6.73

= 0.075kJ

Enthalpy of combustion is enthalpy of reaction. In reaction 1 mole of octane is used. So, enthalpy of 1 mole of octane can be calculated as follows:

For 1.25g heat transferred is 0.075kJ

For 1 mole or 114g of octane heat transferred will be 0.075/1.25 × 114

= 6.84kJ

I hope this will be help you.