How many atoms are in 5.86 mg of silicon?
In one mole of any substance there are
We need to convert the mass of silicon to moles using the molar mass of silicon,
Now, using silicon's molar mass, we'll convert this mass to moles of
Finally, let's use Avogadro's number to convert moles of silicon to individual unts (atoms) of silicon:
We need (i) to find the molar quantity, and given this (ii) we multiply by
And number of silicon atoms,