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Gen. Chem. 2 Lab assignment help

  1. Apr 7, 2010 #1
    1. The problem statement, all variables and given/known data

    Heat of Reaction for the combustion of Magnesium


    A. Mass MgO = 0.7975g Volume 1M HCl = 97.5 ml
    Temp.intial = 24.2 C Temp.final = 29.3 C [tex]\Delta[/tex]T = 5.1 C

    B. mass Mg 0.0896g Volume 1M HCl 89.5 ml
    Temp. intial = 24.1 c Temp. final = 28.4 c [tex]\Delta[/tex]T = 4.3 C

    With the following data above I need to calculate the heat realsed for each reaction
    2. Relevant equations
    Need to use Q=Mc [tex]\Delta[/tex]T also the question tells you to assume one cal of heat is required to change the temperature of one ml of solution one degree Celsius

    3. The attempt at a solution
    not sure were to begin
  2. jcsd
  3. Apr 8, 2010 #2

    Char. Limit

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    Gold Member

    You actually have all of the data you need...

    Just turn the last sentence into something more mathematical.

    "one calorie of heat is required to change the temperature per 1 degree C per mL of solution"

    Is the same as

    [tex]\frac{Q}{T \cross V}[/tex]

    which describes a specific heat capacity, I believe.
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