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September 11, 2020

attachment 1. (a) How does a chemical reaction vary with a c

attachment 1. (a) How does a chemical reaction vary with a chemical equation? Illustrate with a suitable example. (2 marks)(b) What are the information conveyed by a chemical equation? (1 mark)(c) How many grams of oxygen (O2) are required to completely react with 0.5g of nitrogen (N2) to yield NO2? (2 marks)2a. An alkane has molecular mass 72.What is the molecular formula of the alkane? Write down all possible isomers with structures for this molecular formula? (6 marks) b. Give three differences between saturated and unsaturated hydrocarbons. (3 marks)S. N.Saturated HydrocarbonsUnsaturated Hydrocarbons123Give the structure of a 5 carbon alkane with hydroxyl group in position 2 and bromo group in position 4. (1 mark)3a. A chemistry professor asked to his two students to make the standard solution separately. First student was asked to prepare 2Molar solution whereas second student has to prepare 2 molal solution. Which method is more precise or accurate and mention the reason. (1mark) List any points of differences between Molarity and molality. (2 marks)S. N.MolarityMolalityc. An organic compound containing carbon, hydrogen and oxygen gave the following percentage composition. C= 40.68%; H = 5.085% and O = 54.228. The molecular mass of the compound is 118. Calculate the empirical and molecular formula. (7 marks)

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