Homework Help: Chemistry I

Posted by Robbie on Wednesday, September 15, 2010 at 8:47pm.

25.0 mL of ethanol (density = 0.789 g/mL) initially at 4.2°C is mixed with 35.7 mL of water (density = 1.0 g/mL) initially at 25.3°C in an insulated beaker. Assuming that no heat is lost, what is the final temperature of the mixture?

Chemistry I - DrBob222, Wednesday, September 15, 2010 at 9:42pm
[(mass EtOH x specific heat EtOH x (Tfinal-Tinitial)] + [(mass water x specific heat water x (Tfinal-Tinitial)] = 0

Find mass EtOH and mass water from the density.
mass = volume x density. Tf is the only unknown.

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