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The amount of heat Q is given by:
where m = mass (in grams), c = specific heat, ΔT = change in temperature = final T – initial T. We’re given the following values:
m = 82 g
c = 2.22 J/g • ˚C
ΔT = 25.2 ˚C – 11.2 ˚C = 14 ˚C
The specific heat of octane, C8H18 (l), is 2.22 J/g K.
How many J of heat are needed to raise the temperature of 82.0 g of octane from 11.2 oC to 25.2 oC?
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