Question

Here is the combustion reaction for octane (c8h18), which is a primary component of gasoline. how many moles of co2 are emitted into the atmosphere when 20.6 g of c8h18 is burned?

Answer 1

C8H18 molar mass = 114.23 g
18.1/114.23 = 0.15845 mol C8H18
mol C = 8(0.15845) = 1.2878 mol CO2

Answer 2

Answer:

0.5421 moles of carbon dioxide are emitted into the atmosphere.

Explanation:

$1C_3H_8 + 5O_2 \rightarrow 3CO2 + 4H2O$

Moles of octane = $\frac{20.6 g}{114 g/mol}=0.1807 mol$

According to reaction 1 mol of octane gives 3 moles of carbon dioxide.

Then, 0.1807 moles of octane will give:

$\frac{3}{1}\times 0.1807 mol=0.5421 mol$ of carbon dioxide

0.5421 moles of carbon dioxide are emitted into the atmosphere.