Macmillan Learning The source of bitterness in dark chocolate is the compound theobromine, an alkaloid present in cocoa beans. In a sample of dark chocolate there are 6.75 x 1020 molecules of theobromine present. How many milligrams of theobromine are present in the sample? The molecular formula for theobromine is C, H, N₂O₂. m = x10 TOOLS mg

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