What mass of carbon is found in 8.25 x 10^(-6) mol of CaC2?

Question

This is a grade 11 chemistry problem and I need help on, thanks.

Please show all steps thanks.

Answer 1

8.25x10^(-6) x 2 = 8.25*12*2 x10^(-6) grams. BEcause it has 2 atoms of C and ecvery one of them weights 12.

198 x 10^(-6) = 1.98 x 10^(-4) grams = 0,000198 grams = 0,198 mg

Answer 2

8.25 x 10^-6 moles CaC2 x (2 moles C / 1 mole CaC2) x (12.0 g C / 1 mole C) = 1.98 x 10^-4 g C

Answer 3

CaC2 mol.mass = 40 + 24 = 64g/mol.

8.25 x 10^-6 = 0.00000825mol. CaC2.

C2 = 24/40 = 0.6 = 60% of CaC2.

0.6 x 0.00000825 = 0.00000495g Carbon. = 4.95 x 10^-6g.

(I can't see the mass of Carbon being greater than the mass of CaC2).