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##### Q.17 Calculate the heat of formation of ethyl alcohol from the following information(i) Heat of combustion of ethyl alcohol is -1367 \mathrm{~kJ} \mathrm{~mol}^{-1} (ii) Heat of formation of carbon dioxide is- 393.7 \mathrm{~kJ} \mathrm{~mol}^{-1} (iii) Heat of formation of water is -285.8 \mathrm{~kJ} \mathrm{~mol}^{-1} (Ans:-278.4 kcal mol { }^{-1} )

Q.5(a) Differentiate between the following:(i) Internal energy and enthalpy

Q.4. Define the following terms and give three examples of each(v) Exothermic reaction

Q.4. Define the following terms and give three examples of each(viii) Enthalpy of the system

(b) How do you measure the heat of combustion of a substance by bomb calorimeter.

Q.4. Define the following terms and give three examples of each(ii) Surroundings

Q.20 What is the meaning of the term enthalpy of ionization? If the heat of neutralization of \mathrm{HCl} and \mathrm{NaOH} is -57.3 \mathrm{~kJ} \mathrm{~mol}^{-1} and heat of neutralization of \mathrm{CH}_{3} \mathrm{COOH} with \mathrm{NaOH} is -55.2 \mathrm{~kJ} \mathrm{~mol}^{-1} calculate the enthalpy of ionization of \mathrm{CH}_{3} \mathrm{COOH} .(Ans: 2.1 \mathrm{~kJ} \mathrm{~mol}^{-1} )