On average cow milk is 4.7ww lactose. the molecular weight, Ask an Expert

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Question: On average, cow milk is 4.7%(w/w) lactose. The molecular weight of this disaccharide is 342.3g C12H22011. Assuming milk has the density of water (it is >90% water) what is the molarity of lactose in milk?

Question: Fluorine-18 has a half-life of 110 min. If 200 mg of fluorine-18 is stored at 6:30 am, how many mg of the isotope is till active at noon?

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