Answer: 800 cal.
- A 80 cal
- B 336 cal
- C 800 cal
- D 8000 cal
Correct answer: C. 800 cal
Explanation: Q = mL = 10·80 = 800 cal.
During a phase change (melting or boiling), temperature stays constant while heat is absorbed entirely as latent heat (Q=mL); temperature only rises again once the substance is fully in its new phase.
Concept context
Temperature scales, thermal expansion, calorimetry, and the three modes of heat transfer including radiation laws.