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Consider the following reaction between zinc and oxygen

Question:

Consider the following reaction between zinc and oxygen and choose the correct

options out of the options given below :

2 Zn (s) + O2 (g) → 2 ZnO (s) ; ∆H = – 693.8 kJ mol–1

(i) The enthalpy of two moles of ZnO is less than the total enthalpy of two

moles of Zn and one mole of oxygen by 693.8 kJ.

(ii) The enthalpy of two moles of ZnO is more than the total enthalpy of two

moles of Zn and one mole of oxygen by 693.8 kJ.

(iii) 693.8 kJ mol–1 energy is evolved in the reaction.

(iv) 693.8 kJ mol–1 energy is absorbed in the reaction.

Solution:

Option (i) and (iii) are the answers.

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