1. What is the percentage of chlorine present in ?
2. What is the volume in of of oil if its density is ?
3. Find the error(s) and rewrite the text in the correct form.
“According to the Dalton model for the atomic structure, the atomic structure is composed of a nucleus in the center and electrons orbiting around it. The Nucleus has always the same number of protons and neutrons and they are located in the Nucleus. The nucleus carries almost the whole of the mass of the atom. The nucleus is positively charged and the electron is negatively charged. Anions are obtained when electrons are lost. Anions and Cations form salts via ionic bonding. Salts are always soluble in water. All Covalent compounds (molecules) are not soluble in water”.
4. What is the oxidation number of the Sulphur atom in ?
5. The following equation describes the burning of hexane in oxygen: How many moles of water would be produced if of hexane was burnt in excess oxygen?
