THE LIQUID STATE

# THE LIQUID STATE - 2.2.11 THE LIQUID STATE Heat Transfer...

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2.2.11 THE LIQUID STATE Heat Transfer Involving Liquids Q = m C Δ T Q = heat flow M = amount (mass/moles) C = specific heat Example 13-2: How much heat is released by 2.00 x 10 2 g of H 2 O as it cools from 85.0 °C to 40.0 °C? The specific heat of water is 4.184 J/g°C - Molar Heat Capacity is the amount of heat required to raise the temperature of one mole of a substance 1.00°C Example 13-3: The molar heat capacity of ethyl alcohol, C 2 H 5 OH, is 113 J/mol°C. How much heat is required to raise the T of 125 g of ethyl alcohol from 20.0°C to 30.0°C? I mol C 2 H 5 OH = 46.0 g -single phase: use q = m C Δ T - Heat of Vaporization is the amount of heat required to change 1.00 g of a liquid substance to a gas at constant temperature (J/g) - Heat of Condensation is the reverse of heat of vaporization, phase change from gas to liquid 1.00 g H2O (lambda) at 100.0°C arrows 2260 J 1.00 g H20 (g) at 100.0°C - Molar Heat of Vaporization or ΔH vap (Enthalpy) -amount of heat required to change 1.00 mole of a liquid to a gas at constant temperature (J/mol) - Molar Heat of Condensation

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