Chemical formula that compound will be made up of the same elements in the same proportion or ratio. For example, any water molecule is always made up of two hydrogen atoms and one oxygen atom in a 2:1 ratio. If we look at the relative masses of oxygen and hydrogen in a water molecule, we see that 94% of the mass of a water molecule is accounted for by oxygen and the remaining 6% is the mass of hydrogen. This mass proportion will be the same for any water molecule. The alkene called but-2-ene has two isomers, which the chemical formula CHCH=CHCH
Bretherick's Handbook of Reactive Chemical Hazards earlier. Realising that there was no central source of literature on dangerous chemical reactions, he set out to create one, combing through the literature in his spare time. In 1971 his employers (BP) allowed him to do this in half his work time and a book was published in 1975 entitled "Handbook of Reactive Chemical Hazards". The work involved creating what was effectively a database on paper of substances and literature references, arranged by empirical formula, and converting this into a book. This was well received as “an invaluable reference work” One reviewer wrote ““Bretherick” (the name under which this