O-LevelPhysicsThermal Physics5054/12 · May/June 2014 · Q231 Mark
Steam at 100 °C is passed into some water in a beaker. All the steam condenses in the water. The mass of water in the beaker rises from 120.0 g to 122.0 g. The specific latent heat of vaporisation of water is 2250 J/g. How much thermal energy is lost by the steam as it condenses?
A8.9 × 10⁻⁴ J
B1.1 × 10³ J
C4.5 × 10³ J
D2.7 × 10⁵ J
✓ Correct answer
C: 4.5 × 10³ J
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