Question

Howany grams of carbon dioxide CO2 is produced when 3.5 moles of octane C8H18 is burned ?
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Answer 1

1232 g of carbon dioxide are formed

Step-by-step explanation:

As octane is being burned it would be combustion reaction.

writing the balanced equation:

C8H18 + 25/2 O2 → 9 H2O + 8 CO2

now stepping up mole ratio from the balanced equation:

moles of octane : moles of carbon dioxide

1 : 8

3.5 : X

X = 3.5 x 8 = 28

therefore when 3.5 moles of octane are burned in air 28 moles of carbon dioxide are evolved.

now in order to calculate the mass of CO2 formed

molar mass of CO2 = 12 + (16 x 2) = 44g

now calculating the mass of 28 moles:

moles : mass

1 : 44 g

28 : X

X = 28 x 44 = 1232 g

1232 g of CO2 are formed