WAEC Physics 2023 Objective — Question 17
Question 17 of 50 from the West African Examinations Council (WAEC) Physics 2023 Objective paper, with the correct answer and a full explanation.
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The specific latent heat of vapourization of lead is 8.7×10⁵ Jkg⁻¹. This means that 8.7×10⁵ J of thermal energy is required to change
- A. 1 kg molten lead to vapour at constant temperature and pressureCorrect
- B. 1 kg of solid lead to vapour at constant temperature and pressure
- C. a given mass of molten lead to vapour at constant temperature and pressure
- D. 1 kg of molten lead to vapour for every degree rise in temperature
Explanation
Specific latent heat of vaporization is the heat required to convert 1 kg of a substance (already molten/liquid) to vapour at constant temperature and pressure.
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