Question

For the reaction C + 2H2 → CH4, how many moles of carbon are needed to make 174.6 grams 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

The answe is 6 for the reaction of c+ 2H2

Answer 2

To determine the number of moles of carbon needed to make 174.6 grams of methane (CH4), we will first need to calculate the number of moles of CH4 and then use the stoichiometry of the balanced chemical equation to find the moles of carbon (C).

First, let's find the molar mass of CH4:

• Molar mass of CH4 = (1 × 4) + 12 = 16 g/mol

• Now, let's find the number of moles of CH4:

• moles of CH4 = 174.6 g / 16 g/mol = 10.9125 mol

In the balanced chemical equation, 1 mole of carbon (C) reacts with 2 moles of hydrogen (H2) to produce 1 mole of methane (CH4). Therefore, the number of moles of carbon needed is equal to the number of moles of CH4:

• moles of C = 10.9125 mol

Rounding to the nearest tenth:

• moles of C ≈ 10.9 mol

So, approximately 10.9 moles of carbon are needed to make 174.6 grams of methane (CH4).