octane combustion equation

octane combustion equation

 

 

Calculate the volume of oxygen at STP required for the complete combustion of 125 g of octane, C8H18, to form carbon dioxide and water.

 

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octane combustion equation

2C8H18 + 25O2 → 16CO2 + 18H2O

 

 

octane의 MW = 114.23 g/mol

125 g octane의 mol수

125 g / (114.23 g/mol) = 1.094 mol C8H8

 

 

화학량론적으로 octane : O2 = 2 : 25 반응하므로,

반응한 산소의 mol수는

2 : 25 = 1.094 mol : ?

? = 13.675 mol O2

 

 

따라서 STP에서 13.675 mol O2의 부피는

1 mol : 22.4 L = 13.675 mol : ?

? = 306.32 L