Write a balanced equation state the reaction type, and perform the requested stoichiometry: Carbon and hydrogen combine to form methane. How many grams of carbon would be needed to react with 30.2 grams of hydrogen?

C + 2H2 = CH4

Given 30.2g of H2

Find the Moles

Mole =Mass/Molar Mass

Molar Mass of H2 = 1x2 = 2g/mol

Mole = 30.2/2

= 15.1moles of Hydrogen gas.

Now from the balanced equation of Reaction above...

1mole of Carbon reacts completely with 2moles of Hydrogen gas.

"x" moles of carbon with react with 15.1moles of Hydrogen

x = 15.1/2

=7.55moles of carbon.

We now have moles of carbon.

To find mass

Mole =Mass/Molar Mass

Mass = Mole x Molar Mass

Molar mass of carbon = 12g/mol

Mass = 7.55 x 12

Mass = 90.6g of carbon is needed.

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