Complete the chemical formula of the following compounds: a) NH4OH: Ammonium hydroxide b) Na2SO3: Sodium sulfite c) Rhodium (III) oxide: Rh2O3 d) BF3: Boron trifluoride e) Hydrosulfuric acid: H2S f) Sulfurous acid: H2SO3 g) HCN (aq): Hydrocyanic acid h) MnO2: Manganese dioxide