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q represents the change in heat of a reaction or substance. The units of q are Joules (J) or kilojoules (kJ).
For a well understood substance, we can calculate the specific heat which relates the mass of the substance in grams to the amount of heat in J required to raise that amount a certain temperature. We call that specific heat.
The specific heat (Cs) of water is stated in the following way: C s ( H 2 O ) = 4.186 J g ∘ C
This means that it takes 4.186 J of energy to raise the temperature of 1g of water by 1ºC.
The relationship between q and Cs for a given substance is where m is mass (g) and ∆T is the change in temperature in ºC (final temp - initial temp).
Calculate the heat change (q) in J when 8.111 grams of water is cooled from 1.472 ºC to -2.592 ºC.
Enter your answer with one decimal place (tenths). Pay careful attention to the sign of your answer. The sign of ∆T is always the same as the sign for q.
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