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# Chapter: Atoms, Molecules and stoichiometry Part-1

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This PPT will cover main 4 points, Relative Atomic mass, Relative Isotopic Mass, Relative Molecular Mass and Relative Formula Mass.

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### Chapter: Atoms, Molecules and stoichiometry Part-1

1. 1. TO BE COVERED • Relative atomic mass • Relative isotopic mass • Relative molecular mass • Relative formula mass
2. 2. Relative atomic mass The mass of an atom of an Element compared to the mass of 1/12 of the mass of an atom in carbon-12.
3. 3. Relative Atomic Mass
4. 4. Relative Atomic Mass
5. 5. Relative Atomic Mass
6. 6. Relative Atomic Mass Formula:
7. 7. Relative Atomic Mass Examples:
8. 8. Relative Isotopic Mass The mass of an atom of an isotope compared to the mass of 1/12 of the mass of an atom in carbon-12. Formula:
9. 9. Relative Isotopic Mass Examples:
10. 10. Relative Molecular Mass The ratio of the average mass of one molecule of an element or compound to one twelfth of the mass of an atom of carbon-12. Formula:
11. 11. Relative Molecular Mass Examples:
12. 12. Relative Formula Mass The relative formula mass of an ionic molecule is the ratio of sum of the atomic weights of the atoms in the formula of the ionic compound and 1/12th of the mass of one atom of C-12. Formula:
13. 13. Formula Mass Examples:
14. 14. Summery • We did Atomic, Isotopic, Molecular and Formula masses. • Which are relative to s standard “ 1/12th of mass of one atom of C-12”.
15. 15. Try it out • Calculate the molecular masses of : HNO3, H2SO4, AgNO3. • List out the atomic masses of: Zn, V , Mn , Fe. • Give three examples of elements having isotopes. Mention them with their isotopic masses.
16. 16. Thank You