Posts Tagged ‘carafe’
Thermal Coffee
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September 14th, 2011 Posted 5:46 am
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You pour 190.0 g of hot coffee at 90.0 oC into a 220.0- g glass cup at 22.0 oC. If they come to thermal equili?
You pour 190.0 g of hot coffee at 90.0 oC into a 220.0- g glass cup at 22.0 oC. If they come to thermal equilibrium quickly, what is the final temperature (in oC, enter deg in asnwer box)? Assume no heat is lost to the surroundings.
i understand the concepts but i cant seem to derive the formula im not just looking for a straight answer but could someone please help me out?
Q out of the Cu = Q into the cup
so m*c*(90 - Tf) = m*c*(Tf - 22)
0.190kg*4190J/kg-oC*(90 - Tf) = 0.220*840*(Tf - 22)
or 980.9Tf =75715
So Tf = 75715/(980.9) = 77.2oC
Melitta 10-Cup Thermal Coffee Brewer