For the reaction C + 2H2 → CH4, how many grams of carbon are required to produce 1.2 moles of methane, CH4 ?

Question

For the reaction C + 2H₂ → CH₄, how many grams of carbon are required to produce 1.2 moles of methane, CH₄ ?

Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0

Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:

Element	Molar Mass
Hydrogen	1
Carbon	12

Answer 1

You need 14.4 g C.

1.2 mol CH4 x (1 mol C / 1 mol CH4) = 1.2 moles of C.

1.2 mol C x (12 g C / 1 mol C) = 14.4 grams of C.

Answer 2

C + 2H₂ ==> CH₄ .. balanced equation

molar mass C = 12 g / mol

molar mass H = 1 g / mol

molar mass CH₄ = 12 + 4 = 16 g / mol

Use dimensional analysis to compute the answer:

1.2 mols CH₄ x 1 mole C / mol CH4 x 12 g C / mol C = 14.4 g C (rounded to nearest tenth)