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 potassium iodide present in 61.42 g of it. The molecular weight of potassium iodide is 166 g/mol.


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lb equals 0.37 mol kg

    The molecular weight of potassium iodide is 166 g/mol, which means `(166 \quad g)/(1 \quad mol)`. Therefore, using equation method we can write:
    `(166 \quad g)/(1 \quad mol)=(61.42 \quad g)/x therefore x = 0.37` 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=(61.42 \quad g)/(166 (g/(mol)))=0.37\quad mol` Ans.


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