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Posted by on Friday, February 10, 2012 at 12:54am.

2C6H6(l) + 15O2(g) -> 12CO2(g) + 6H2O(l) + 6542 kJ

If the heat from burning 7.000 g of C6H6 is added to 5691 g of water at 21 degrees C what is the final temperature of the water?

  • Chemistry - , Friday, February 10, 2012 at 12:00pm

    How much energy do you obtain from the combustion of benzene?
    That is 6542 x (7 g/2*78g) = about 293 kJ or 293,000 J.
    Then 293,000 = mass H2O x specific heat H2O x (Tfinal-Tinitial).
    Solve for Tfinal. Those numbers above are approximate; you should go through it with your calculator to obtain a more accurate reading.

  • Chemistry - , Friday, February 10, 2012 at 12:41pm

    your approximations are very accurate.. thanks!

  • Chemistry - , Friday, March 22, 2013 at 2:39am

    is the final and intial temperature in kelvin or celcius my calculations seem off

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