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PIMSO 2022 - Science - Grade 10 - National Round Question 16

PIMSO Science · PIMSO 2022 - Science - Grade 10 - National Round

Question 16

A mass of ice at −50 °C is heated slowly until it melts, becomes liquid, and ultimately steam, at 140 °C. Assuming no mass loss during heating, at what stage of the process is the system requiring the most amount of heat?
Assume constant heat capacities: c(ice)=2.108 kJ/kg K, c(water)=4.187 kJ/kg K, c(steam)=1.99 kJ/kg K.
Other printed constants: ΔH(fus)=334 kJ/kg, ΔH(fus)=334 kJ/kg, ΔH(vap)=2260 J/g.
  1. While heating the ice from −50 °C to 0 °C
  2. While the ice melts to water at 0 °C
  3. While water heats from 0 °C to 100 °C
  4. While water vaporizes to steam at 100 °C
  5. While heating steam from 100 °C to 140 °C