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Calculating moles from the number of atoms

How many moles of Pb are in 9.3*10^15 atoms of Pb?

Solution This solution is FREE courtesy of BrainMass!

Here we can solve the problem with a simple equation. We only need to know that 1 mole consists of Avagadro number of atoms, that is 6.02 * 10^23. We form the equation like that:

If 6.02 * 10^23 atoms make 1 mole
9.3 * 10^15 atoms make X mole

Here X equals (9.3* 10^15 * 1)/6.02 * 10^23 = 1.54 * 10^(-8).