Question

You have a block of ice at a temperature of -100°C. This block of ice is...

You have a block of ice at a temperature of -100°C.

This block of ice is made from 180g H2O.

The block of ice will be heated continually until it becomes super-heated steam at a temperature of 200°C

Cice = 2.03 J/g-K

ΔHfus=6.01 kJ/mol

Cwater = 4.18 J/g-K

Csteam = 1.84 J/g-K

ΔHvap=40.67 kJ/mol

  1. What is the enthalpy change raising the temperature of 180 g of ice at −100 °C to 0°C?
  1. What is the enthalpy change upon melting 180 g of ice at 0°C?

(How much heat is required to melt the ice?)        NOTE: The heat of fusion gives you kJ per mole.

  1. What is the enthalpy change upon heating 180 g of water from 0 °C to 100°C?
  1. What is the enthalpy change upon converting 180 g of water at 100°C to steam?

      (How much heat is required to convert the liquid water into steam?)

NOTE: The heat of fusion gives you kJ per mole.

  1. What is the enthalpy change upon heating 180 g of steam at 100 °C to 200 °C?
  1. What is the enthalpy change upon heating 180 g of ice at −100 °C to steam at 200 °C?

HINT: The total heat (enthalpy) is simply the sum of the enthalpy of all the individual steps.

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