How much heat is evolved in converting 1.00 mol of steam at 145.0 ∘C to ice at - 55.0 ∘C? The heat capacity of steam is 2.01 J / (g⋅∘C) and of ice is 2.09 J / (g⋅∘C).

Question

Chemistry

Cale Douglas

1 November, 02:53

How much heat is evolved in converting 1.00 mol of steam at 145.0 ∘C to ice at - 55.0 ∘C? The heat capacity of steam is 2.01 J / (g⋅∘C) and of ice is 2.09 J / (g⋅∘C).

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Demetrius Ross · Answer 1

Conversion of water vapour from 145°C

Mass of water vapour = 1.00 mo1H₂O * 18.02g/1mo1H₂O

= 18.0g

The heat capacity of water vapour; S = 2.01 J/g °C

Amount of heat released Q₁ = ms ΔT

18.0g * 2.01 J/g °C * (100°C - 145°C)

= - 1628.1J

= 1628.1