Monday
September 15, 2014

Homework Help: Chemistry

Posted by Rayana on Sunday, November 21, 2010 at 10:57am.

When a vehicle is parked in the sunlight on a hot summer day, the temperature inside can approach 55 deg C. one company has patented a non-CFC propelled aerosol that can be sprayed inside a vehicle to reduce the temperature to 25 deg C within seconds. the spray contains a mixture of 2 liquids, 10% ethanol and 90% water by mass.

1) Use thermochemical equations and the corresponding enthalpy changes to explain how the spray works (note-this is not a chemical reaction).

2)1g of the aerosol is sprayed into a hot vehicle. how much heat can be absorbed due to vaporization of the aerosol?
Note: (delta)H-vaporization of water is 44.0kJ/mol and (delta)H-vaporization of ethanol is 38.56 kJ/mol

Any amount of help would be very much appreciated.

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