Question

Consider the following chemical reaction: CH4 + 2O2 → CO2 + 2H2O 4 moles of methane (CH4) are combined with 5 moles of oxygen (O2). How much carbon dioxide (CO2) will form?

Answer 1

CH4   +    2O2 ----------------------------> CO2 +   2H2O

1mol        2 mol

4mol         5 mol

moles ratio of methane = 4 /1 = 4

moles ratio of O2 = 5 / 2 = 2.5

so O2 is limiting reagent .

2 moles O2 ---------------------------> 1 mol CO2

5 moles O2 ------------------------> 5 x 1 / 2 = 2.5 moles CO2

moles of CO2 formed = 2.5

mass of CO2 = 2.5 x 44 = 110 g

moles of CO2 formed = 2.5

mass of CO2 = 110 g