Answer:- 335 kcal of heat energy is produced.
Solution:- The balanced equation for the combustion of glucose in presence of oxygen to give carbon dioxide and water is:

From given info, 2803 kJ of heat is released bu the combustion of 1 mol of glucose. We need to calculate the energy produced when 3.00 moles of oxygen react with excess of glucose.
We could solve this using dimensional analysis as:

= 1401.5 kJ
Now, let's convert kJ to kcal.
We know that, 1kcal = 4.184kJ
So, 
= 335 kcal
Hence, 335 kcal of heat energy is produced by the use of 3.00 moles of oxygen gas.
By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom.
B ia the correct one .
Hydrogen only uses the first energy shell, which holds 2 electrons, not 8.
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Answer:
30 moles
Explanation:
From the equation it is a one - to - one reaction