How many moles of C are in a sample of C5H12 that also contains 22.5 g of H.

Answer 1

C₅H₁₂

For every 1 mole of C atoms there are 12 moles of H atoms.

Convert 22.5 g H to moles of H: 22.5 g H x 1 mol H / 1.01 g = 22.28 moles H

Convert moles H to moles of C: 22.28 mols H x 5 moles C / 12 moles H = 9.28 moles C

Finally, convert moles C to number of C atoms: 9.28 mols C x 6.02x10²³ C atom/mol = 5.59x10²⁴ C atoms