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.


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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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