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Question

How many litres of O2 at STP are needed for the complete combustion of 40 g of liquid hexane?
  1. 55.6 L
  2. 101.2 L
  3. 122.6 L
  4. 94.6 L


Solution

The correct option is B 101.2 L
2C6H14 +19O212CO2 + 14H2O

2 moles of hexane reacts with 19 moles of O2

Molar mass of hexane = 86 g

84×2 g of hexane completely combusts in 19×22.4 L of oxygen at STP.

168 g of hexane completely combusts in 425.6 L of oxygen at STP.

So, the amount of O2 required to completely combust 40 g of hexane =425.6168×40 L of oxygen at STP.
 
= 101.2 litres of O2

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