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Since there are 6.02214076 × 10 23 particles (atoms, molecules, ions etc.) per mole, 1 joule per mole is equal to 1 joule multiplied by 6.02214076 × 10 23 particles. Because of the typical order of magnitude for energy changes in chemical processes, kJ·mol −1 is normally used instead of J·mol −1 .
One tablespoonful (5 grams) of dry unsweetened cocoa powder has 12.1 mg of caffeine [97] and a 25-g single serving of dark chocolate has 22.4 mg of caffeine. [98] Although a single 7 oz. (200 ml) serving of coffee may contain 80–175 mg, [ 99 ] studies have shown psychoactive effects in caffeine doses as low as 9 mg, and a dose as low as 12.5 ...