Question

Which has more C atoms, 100.0 g CH2O, 100.0 g C2H4O2 , or 100.0 g C6H12O6?

Which has more molecules, 100.0 g CH2O, 100.0 g C2H4O2 , or 100.0 g C6H12O6?

Thank you!!

Answer 1

Moles of CH₂O = 100 / (12+2+16) = 2.5

Atoms of C = 2.5 x 6.023 x 10²³ = 15.0575 x 10²³

Number of Molecules = 2.5 x 6.023 x 10²³ = 15.0575 x 10²³

Moles of C₂H₄O₂ = 100 / (24+4+32) = 1.667

Atoms of C = 2 x 1.667 x 6.023 x 10²³ = 20.077 x 10²³

Number of Molecules = 1.667 x 6.023 x 10²³ = 10.04 x 10²³

Moles of C₆H₁₂O₆ = 100 / (72+12+96) = 0.555

Atoms of C = 6 x 0.555 x 6.023 x 10²³ = 20.077 x 10²³

Number of Molecules = 0.555 x 6.023 x 10²³ = 3.343 x 10²³

Hence, C₂H₄O₂ & C₆H₁₂O₆ has more C-atoms than CH₂O. And CH₂O has more molecules than C₂H₄O₂ & C₆H₁₂O₆.