Verified answer

The atomic mass of Phosphorous is 30.974 g. From this you can calculate the number of moles you have like so:

# moles = mass / atomic mass

# moles = 158 / 0.030974

# moles = 5,101.0525 moles

Now you can find the number of atoms by multiplying by Avagadro's constant:

# atoms = # moles * 6.022 * 10^23

# atoms = 5,101.0525 * 6.022 * 10^23

# atoms = 3.072 * 10^27 atoms

And this is the answer.

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