Molecular Formulae

• NH3

  ammonia
• HCl

  hydrochloric acid
• H2SO4

  sulfuric acid
• HNO3

  nitric acid
• H3PO4

  phosphoric acid
• Ag+


  silver (I)
• Zn 2+


  zinc (II)
• NH4 +


  ammonium
• H+


  hydrogen
• NO3 -

  nitrate
• SO4 2-

  sulfate
• CO3 2-

  carbonate
• HCO3 -

  hydrogencarbonate
• OH-

  hydroxide
• H-

  hydride
• PO4 3-

  phosphate
• what is relative atomic mass?

  weighted mean mass compared with 1/12th mass of Carbon-12
• relative isotopic mass

  mass compared with 1/12th mass of Carbon-12
• relative formula mass (relating to a molecule / relative molecular mass)


  average mass of a molecule of a substance raletive to 1/12th mass of a carbon-12 atom
• relative formula mass (general substance)

  sum of the relative atomic masses of all the atoms in the formula of the substance
• mole equation


  mol = mass/mr