Carbon and oxygen are elements, not molecules, so their chemical formulas are just their symbols, C and O. However, oxygen forms a gas that's made up of diatomic molecules whenever there are two atoms near each other (basically always) so it's represented as O2.
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Most oxygen is found as a diatomic molecule. (Yes, there is some ozone, but not much down here. And it's unstable, spontaneously reverting to O2 in a few minutes.) There are two atoms of oxygen in an oxygen molecule. Methane is a carbon atom bonded to four hydrogen atoms. O2 and CH4 are the oxygen and methane molecules.
the chemical conposition of a carbohydrate is carbon (C), hydrogen (H), and oxygen (O)
There really is no single chemical formula that describes it because it's a solution of many types of chemicals, but the multiple chemical formulas are: CO2, H2O, C12H24O12 (, NaC6H5CO2 (sodium benzoate), and others. Citric Acid contains Carbon (C), Hydrogen (H), and Oxygen (O).
A crystal is defined in science as the product of two or more elements which combine in a chemical reaction to form a solid compound. Sugar is composed of 3 elements: Carbon, Hydrogen and Oxygen. Then chemical formula is C6H12O6 (6parts Carbon, 12 parts Hydrogen, 6 parts Oxygen) So yes, Sugar is a crystal. Salt is also a crystal.
A carbon atom is made up of six neutrons and six electrons.