D-number of electrons in the outer energy level.
1 mol of formic acid is correct. There are two oxygen atoms in formic acid, compared to just one for the other molecules.
Answer:
The type of reaction for the following equation is combustion equation.
Explanation:
Combustion reaction is defined as the chemical reaction in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide gas and water molecule.

The reaction given to us:

When 1 mole of ethane reacts with 7/2 moles of oxygen gas it gives 3 moles of water and 2 moles of carbon dioxide gas.
The type of reaction for the following equation is combustion equation.
I believe that would be option A. Newton. I say this because he discovered gravity in the first place.