What do you often notice after you balance a hydrocarbon combustion
reaction equation?
O
A. Sometimes the coefficient for the oxygen molecule is not a whole
number
O
B. Sometimes the oxygen molecules do not balance in the equation.
O
C. Sometimes the oxygen molecule is written as separate oxygen
atoms
O
D. Sometimes the oxygen molecules are spectator ions in the
reaction

A. Sometimes the coefficient for the oxygen molecule is not a whole number

Explanation:

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

i'm assuming that the correct answer is indeed the first one/ "a"..