<u>Answer:</u> The mass of oxygen gas required is 36.7 grams.
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
.....(1)
Given mass of hexane = 10.4 g
Molar mass of hexane = 86.18 g/mol
Putting values in equation 1, we get:
The chemical equation for the combustion of hexane follows:
By stoichiometry of the reaction:
2 moles of hexane reacts with 19 moles of oxygen gas
So, 0.12 moles of hexane will react with = of oxygen gas.
Now, calculating the mass of oxygen gas by using equation 1, we get:
Molar mass of oxygen gas = 32 g/mol
Moles of oxygen gas = 1.14 moles
Putting values in equation 1, we get:
Hence, the mass of oxygen gas required is 36.7 grams.