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Im kind of confused as to when heat is in J and when in KJ, for example a solution gives: q=mCΔT= (80.0g)(4.187J/C/g/)(20C-0C)=6.69kJ but the specific heat is given in J so I don't understand why the answer is in KJ? Is this just an error or am I missing something? Thanks for any help!
If the heat/energy value is really large (>10^3), then use kJ so that your numerical answer won't be so huge. If your heat/energy value is smaller, you can use J. It's really just dependent on the size of the numbers you're dealing with.
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