For the reaction C + 2H2 → CH4, how many moles of hydrogen are needed to make 107.1 grams of methane, CH4 ?

Question

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

(107.1g CH₄) * (1 mol CH₄ / 16.0g CH₄) * (2 mol H₂ /1 mol CH₄) = 13.4 moles of H₂ gas.