chemistry

How much energy is needed to raise 20.0g H2O from 10.0oC to 75.0oC. The specific heat of water is 4.18 J/gC.

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  1. to get the heat released or absorbed,
    Q = mc(T2-T1)
    where
    m = mass of substance (units in g)
    c = specific heat capacity (units in J/g-K)
    T2 = final temperature
    T1 = initial temperature
    *note: units of temp doesn't matter if it's in degree Celsius or Kelvin, as long as T1 and T2 have the same units (since it's difference in temperature or delta,T)
    **note: if Q is (-), heat is released and if (+), heat is absorbed

    substituting,
    Q = (20.0)(4.18)(75-10)
    Q = 5434 J

    hope this helps~ :)

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