Calculate the pressure ( in atm) at which the freezing temperature of water is -20°C = 253 K H₂O(s) → H₂O(1) AH°ƒ ( = AH°) = 6010 J/mole at T = 273 K, P = 1 atm (fusion = melting) V solid 1.963x10-5 m³/mole Vliquid 1.800x10-5 m³/mole = = Assume AH°f, Av₁ = V₁ - V₁ are constant · · 1 atm = 1.013x105 Pa Caution: signs and units

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