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The molecular weight of glucose is 180. Let's say that you intend to make 100 ml of 5M solution. Here is the formula that can help you out every time you are dealing with molarity. (X, which is the desired weight divided by the molecular weight) X (1000/100, which is the desired volume) = 5, which is the desired molarity.

So, X/180 X 1000/100 = 5; then X = 90.

You need 90 g of glucose to make a 5 M of 100 ml solution of glucose.

Hope this is clear,

Samba.

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