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delta H = -43,2 kkal (krna berpindah posisi)
mol utk 45 g = 45/(7+ 16) = 1, 96 mol
jadi 1 mol 2NO = -43,2/2 = -21,6 kkal
utk 1, 96 mol = -21,6 x 1,96 = -42, 34 kkal
semoga bermanfaat dan maaf bila ada yg slh atau krg