Question

A sample of C3H8 has 5.68 × 1024 H atoms.

Part 1) How many carbon atoms does the sample contain?

Part 2) What is the total mass of the sample?

Answer 1

5.68 * 10^24 H atoms are in the sample

number of C3H8 units = (5.68 * 10^24 / 8) = 7.1 * 10^23

Number of Carbon atoms = 3 * 7.1 * 10^23 = 2.13 * 10^24 atoms

number of moles of C3H8 units = (7.1* 10^23 / 6.023 * 10^23)

                                                          = 1.1788 moles

1 mole of C3H8 has 44 g of mass

1.1788 moles of C3H8 has 44 * 1.1788 = 51.8672 g