What do you know about a chemical compound by looking at its chemical
formula?
a the number and kinds of atoms in the compound
b how many molecules are in a sample
20%
c the properties of the molecules in the compound
60%
d how the compound reacts with other compounds

the answer is aExplanation:compound is a substance made up of a definite proportion of two or more elements. A chemical formula tells us the number of atoms of each element in a compound. ... Let's take a look at the chemical formula of glucose: there are 12 carbon (C) atoms, 22 hydrogen (H) atoms and 11 oxygen (O) atoms