Molecules seldom have names they are usually refered to by their chemical formula.
Two molecules of water.
molecules
The small space between two neurons where neurotransmitter molecules are released is called the synapse.
sucrose
disaccharide
Two molecules of Carbon monoxide. I think not two molecules but two moles of carbon monoxide .i,e 2CO.
autoionization
Two ATP molecules Two ATP molecules
The two molecules that alternate to form the backbone of a DNA molecule are deoxyribose sugar and phosphate groups. These molecules form a repeating pattern along the length of the DNA strand, with the nitrogenous bases (adenine, thymine, cytosine, and guanine) attached to the deoxyribose sugar molecules.
compounds are 2 or more elements bound together, a mixture is 2 or more elements and/or compounds physically mingled together
Ethane does not have any molecule of carbon dioxide. However when ethane undergoes combustion then two molecules of carbon dioxide are formed (as ethane contains two carbon atoms).
The 2 molecules produced after inhaling and exhaling oxygen is two carbon dioxide molecules I believe