1. What is the change in the internal energy of a system that absorb 1,200 J of heat and that does 7,218 J of work on the surroundings at constant pressure?

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(no3)⁻n has oxidation number x,o has oxidation number -2.(x*1 -2*3) charge of the nitrate ion, and we know that charge of the nitrate ion =-1.so,(x*1 -2*3) =-1x-6=-1x=+5answer a. +5.