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15 October, 18:50

Calculate the mass of dry ice that should be added to the water so that the dry ice completely sublimes away when the water reaches 22 ∘

c. assume no heat loss to the surroundings.

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  1. 15 October, 18:56
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    15 liters H2O = 15*1000g = 15,000 grams

    heat needed to raise one gram water, one degree celsius = 4.18J

    4.18J * 15,000g = 62,700J = 62.7kJ needed per degree C

    85 - 22 = 63C temp drop needed

    62.7 kJ * 63C = 3950.1kJ needed from CO2

    enthalpy of CO2 = 393.51kJ/mol

    CO2 = 44g/mol = 22.73 moles/kg

    393.51kJ/mol * 22.73 moles/kg

    = 8,943.4 kJ/kg

    3950.1kJ / 8,943.4 kJ/kg =.4417 kg of CO2 needed
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