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QUESTION
How do you convert 7.5 x 10^4 j into kilojoules?
The prefix ##k## (kilo) means 1000.
So, just like you convert grams into kilograms by diving by 1000:
##7.5*10^4J=7.5*10000J=75000J##
##75cancel(000)cancelJ*(1kJ)/(1cancel(000)cancelJ)=75kJ##
