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    pearley's Avatar
    pearley Posts: 2, Reputation: 1
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    #1

    Jun 16, 2009, 01:55 PM
    Joules and calories
    Calculate the energy, in both joules AND calories, that is required to heat 75 g of water from 2.1 degree C to 86.4 degree C
    Curlyben's Avatar
    Curlyben Posts: 18,514, Reputation: 1860
    BossMan
    		  
    #2

    Jun 16, 2009, 01:55 PM
    Thank you for taking the time to copy your homework to AMHD.
    Please refer to this announcement: Ask Me Help Desk - Announcements in Forum : Homework Help
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #3

    Jun 16, 2009, 04:24 PM
    Quote Originally Posted by pearley View Post
    calculate the energy, in both joules AND calories, that is required to heat 75 g of water from 2.1 degree C to 86.4 degree C
    The freezing point of water is 0C. The boiling point is 100C. Your sample won't go through either of those points, so you don't have to worry about the enthalpy of fusion or the enthalpy of vaporization (if you don't know what those are, you should look them up because your teacher will probably ask a question using those on the test.).

    The specific heat of water is

    Basically, what that means is that it requires 1 calorie to heat 1 gram of water 1 degree Celsius (1 C). If you have two grams, you need two calories, etc. Basically, you multiply this by the number of grams and also by the number of degrees C you're heating the water:



    You can convert calories to joules rather easily. Click here: Let me google that for you - Calories to Joules
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