Thursday

January 29, 2015

January 29, 2015

Posted by **Jen** on Thursday, February 23, 2012 at 11:00pm.

assume the heat capacity of coffee is the same as that for water, and you can neglect all heat losses and the solubility of CO2 in coffee. The molar mass of CO2 is 44.0 g/mol. The specific heat capacity, s = 0.850 J/goC for CO2(g);

a) Calculate the heat (qsub) required to sublime 40.0 grams of dry ice to form gaseous CO2 at -78.0 degrees C.

b) Write an expression for the quantity of heat (qgas) required to increase the temperature of the gaseous CO2 from -78.0 degrees C to the final temperature of the coffee.

c) Calculate the final temperature of the coffee in degrees C. Is the temperature of the coffee acceptable?

d) Calculate the value of ΔU for the CO2, assuming an atmospheric pressure of 1 atm.

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