Answer: 298 K.
- A 298 K
- B 248 K
- C 25 K
- D 373 K
Correct answer: A. 298 K
Explanation: K = C + 273.15, so 25°C = 298.15 K, approximately 298 K.
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.