How do I approach this kind of problem?Screenshot 2026-01-19 133223.png
heating curve of water.png
Step 1: Identify the path (state changes + temperature changes)
You are going from:H2O(𝑠)at 0∘C →H2O(g) at 100 ∘C
That requires three stages:
1) Melt ice at 0°C → liquid at 0°C (fusion) B to C in heating curve)
q1 = m ΔH0 fusion ( m is the mass of water)
2) Heat liquid water 0°C → 100°C (temperature rise from C to D in heating curve)
q2 = mcΔt (m is mass of water)
3) Vaporize liquid at 100°C → steam at 100°C (vaporization)
q3 = m Δ 𝐻 vap �
Total amount of heat needed = q1 + q2 + q3