How many moles are in a sample of 4.55 x 10^24 molecules of C3H8?

Answer: 7.56 moles

Explanation:

C3H8 is the chemical formula for propane, the third member of the alkane family.

Recall that based on Avogadro's number, 1 mole of any substance has 6.02 x 10^23 atoms

So 1 mole of C3H8 = 6.02 x 10^23 atoms

Z moles of C3H8 = 4.55 x 10^24 atoms

To get the value of Z, we cross multiply:

1 x 4.55 x 10^24 atoms = Z moles x (6.02 x 10^23 atoms)

4.55 x 10^24 atoms = Z moles x (6.02 x 10^23 atoms)

To get the value of Z divide both sides by 6.02 x 10^23 atoms

Z moles = 4.55 x 10^24 atoms ➗ 6.02 x 10*23 atoms

Hence, Z = 7.56 moles

Thus, the number of propane, C3H8 is 7.56 moles