Answer: The mass of oxygen atom that will react with given amount of benzene will be 32.17 grams.
Step-by-step explanation:
To calculate the number of moles, we use the equation:
.....(1)
For Benzene:
Given mass of benzene = 10.47 g
Molar mass of benzene = 78.1074 g/mol
Putting values in above equation, we get:

For the given chemical reaction:

By stoichiometry of the reaction:
2 moles of benzene reacts with 15 moles of oxygen.
So, 0.134 moles of benzene will react with
of oxygen.
Now, to calculate the mass of oxygen, we use equation 1
Moles of oxygen gas = 1.005 mol
Molar mass of oxygen gas = 32 g/mol
Putting values in equation 1, we get:

Hence, the mass of oxygen atom that will react with given amount of benzene will be 32.17 grams.