Just as one dozen eggs always has 12 eggs in it, one mole of a substance always has the same number of particles in it, 6.02 x 1023.

If you measure 27.0 g of aluminum foil, which is 1 mole of aluminum,

how many Al atoms does it contain?

Explanation:

Hello,

In this case, given the described concept regarding the Avogadro's number, we can easily notice that 27.0 g of aluminium foil has 6.022x10²³ atoms as shown below based on the mass-mole-particles relationship:

Notice this is backed up by the fact that aluminium molar mass if 27.0 g/mol.

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