## College Physics (4th Edition)

The chemical formula for this acid is $HNO_3$
A hydrogen atom has 1 proton and a mass of 1 u. We can find the number of hydrogen atoms in this molecule: $(0.016)(63~u) = 1.0~u$ The molecule has one hydrogen atom. A nitrogen atom has 7 protons and 7 neutrons. It has a mass of 14 u. We can find the number of nitrogen atoms in this molecule: $(0.222)(63~u) = 14.0~u$ The molecule has one nitrogen atom. An oxygen atom has 8 protons and 8 neutrons. It has a mass of 16 u. We can find the number of oxygen atoms in this molecule: $(0.762)(63~u) = 48.0~u$ The molecule has three oxygen atoms. The chemical formula for this acid is $HNO_3$