### Calculate moles from provided weight

4. Moles and Molarity 4.1) Moles 4.1.1) Moles - General

4.1.1.1) Moles - General Normal 1

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Calculate the number of moles of penicillin V potassium present in 176.54 g of it. The molecular weight of penicillin V potassium is 388 g/mol. Click on the button below to see the answer and explanations

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lb equals 0.455 mol kg

The molecular weight of penicillin V potassium is 388 g/mol, which means (388 \quad g)/(1 \quad mol). Therefore, using equation method we can write:
(388 \quad g)/(1 \quad mol)=(176.54 \quad g)/x therefore x = 0.455 mol, Ans.

Using shortcut, the number of moles (n) is obtained by dividing gram amount of the substance with its molecular weight. Therefore,
n=g/a=(176.54 \quad g)/(388 (g/(mol)))=0.455\quad mol Ans.

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