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Class 9Class 10First YearSecond Year
$Q.17 Calculate the heat of formation of ethyl alcohol from the following information(i) Heat of combustion of ethyl alcohol is -1367 \mathrm{~kJ} \mathrm{~mol}^{-1} (ii) Heat of formation of carbon dioxide is- 393.7 \mathrm{~kJ} \mathrm{~mol}^{-1} (iii) Heat of formation of water is -285.8 \mathrm{~kJ} \mathrm{~mol}^{-1} (Ans:-278.4 kcal mol { }^{-1} )$

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

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

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

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

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

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