alleryStart learning →How much heat is needed to melt 1.000 kg of ice already at 0 degrees Celsius? Use the latent heat of fusion of water, 334 kJ/kg.
A33.4 kJ
B167 kJ
C334 kJ
D668 kJ
Answer & Solution
Correct answer: C. 334 kJ
1. Melting uses the relationship Q = mLf, where Lf is the latent heat of fusion.
2. Substitute m = 1.000 kg and Lf = 334 kJ/kg.
3. Multiply: Q = 1.000 x 334 = 334 kJ.
4. 33.4 kJ is ten times too small, and 668 kJ is double the correct value, while 167 kJ is half of it.
5. So 334 kJ is correct.
_Source: OpenStax Physics (CC BY 4.0), Ch 11 "Thermal Energy, Heat, and Work", section 11.3 Phase Change and Latent Heat_
Keep practising Thermal Energy, Heat, and Work
Browse all Thermal Energy, Heat, and Work questions for GCE O-Level (Singapore), or explore more Physics topics.
Related questions
A 3.00 kg sample at its boiling point is entirely boiled away by 5360 kJ of heat. What is How much energy is required to melt 7.00 kg of aluminum already at its melting point? Use In which phases of matter can the particles change position relative to their neighbours?How is latent heat defined?If 2500 kJ of heat is just enough to melt 3.0 kg of an unknown substance, what is that subHow much energy is needed to melt 2.00 kg of ice already at 0 degrees Celsius? Use Lf(wateHow much heat is needed to vaporize 1.000 kg of water already at 100 degrees Celsius? Use What is the name for a direct phase change from solid to gas?