The specific latent heat of vapourization of lead is 8.7 \times \(10^5 Jkg_1\). This means that 8.7 \times \(10^5\) J of thermal energy is required to change
A
a given mass of molten lead to vapour at constant temperature and pressure.
B
1 kg of molten lead to vapour at constant temperature and pressure.
C
1 kg of solid lead to vapour at constant temperature and pressure.
D
1 kg of molten lead to vapour for every degree rise in temperature.
Verified Correct Answer: B.
Physical Principles & Numerical Solution
The specific latent heat of vaporization of lead is the amount of thermal energy required to change 1 kg of molten lead to vapor at constant temperature and pressure.
Source: Myschool Past Questions Archive (Record #69402)