LECTURE 2 CHAPTER 1 Introduction to Fundamental Concepts of Chemistry

EQUPMENTS REQUIRED BEFORE START OF LECTURE BOOK (WITH THE PARTICULAR CHAPTER OPENED) ROUGH REGISTER PEN & CALCULATOR

TOPICS TO BE COVERED Stoichiometry Element, Atom, Molecule, Compound Atomic Mass (Numerical) Molecular Mass (Numerical) Formula Mass (Numerical) Empirical Formula (Numerical) Molecular Formula (Numerical) Mole (Numerical) Avogadro’s Law (Numerical) Stoichiometry Mass-Mass Relationship (Numerical) Mass-Volume Relationship (Numerical) Volume-Volume Relationship (Numerical)

Stoichiometry: The study of the relationships between the amounts of reactants and products in the chemical equation is known as stoichiometry. There are 3 types of relation ship.

Mass-Mass Relationship Calculate the weight (mass) of CO2 that can be obtained by heating 25gm of CaCO3(Lime stone) and also calculate the mass of CaO. CaCO3CO2 + CaO

Mass-Volume Relationship Calculate the volume of CO2 produced at Standard Temperature Pressure (STP) by combustion of 20gm of methane. CH4 + O2  CO2 + H2O Calculate the volume of oxygen gas at STP for the complete combustion of 2 moles of carbon di sulphide (CS2). Calculate the volume of CO2 and SO2 produced. CS2 + O2 CO2 + SO2

Volume-Volume Relationship What volume of O2 is required to burn 500dm3 of ethyne gas. Also find the volume of carbon dioxide formed. C2H4 + O2  CO2 + H2O What volume of O2 at STP is required to burn 900dm3 of H2S and produce SO2 and H2O assuming all are perfect gases at STP. H2S + O2  H2O + SO2

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