Question

How many moles of CO2 are emitted into the atmosphere when 25.6 g C8H18 is burned

Answer 1

When 25.6 g
`C_(8) H_(18)` is burned, the moles of
`CO_2` emitted into the atmosphere is 1.80 mol

Step-by-step explanation:

The molar mass of octane
`C_(8) H_(18)` is calculated as 8(12) +18(1) = 114 g/mol.

Where atomic mass of Carbon is C=12, and Hydrogen H=1.The sample contains 25.6 g of octane, Therefore

`(25.6 g)/(114 g / m o l)=0.225 \mathrm{mol}`

The combustion of octane can be written as:

`2 C_(8) H_(18)+25 O_(2) \rightarrow 16 C O_(2)+18 H O_(2)`

The mole ratio can be represented as:

`C O_(2): C_(8) H_(18)` = 16:2 = 8:1.

Hence, the quantity of carbon dioxide emitted is:

`(8)/(1) * 0.225 \mathrm{mol}` = 1.80 mol