Chapter 1 2023/2024
Chapter 1 2023/2024
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a) Naturally occurring chlorine has two isotopes. The relative isotopic masses and their abundance are determined using a mass spectrometer. Based on the data in TABLE 1, calculate the relative atomic mass of chlorine.
[3 Marks]
b) Barium oxide, BaO reacts with water to produce barium hydroxide, Ba(OH)2 solution. Calculate the mass of BaO needed to prepare 2.50 L of 0.0600 M Ba(OH)2 solution.
[3 Marks]
c) An organic compound contains carbon, hydrogen, and oxygen. An amount of 141.72 g of this compound is completely burned in excess oxygen to produce 207.8 g of CO2 and 85.04 g of H2O. If the molecular weight of this compound is 120 g mol-1, determine the empirical formula and molecular formula.
[10 Marks]
d) A solution containing iron (II) ion, Fe2+ is titrated with potassium dichromate, K2Cr2O7 solution .
i. Fe2+ is oxidised to Fe3+ whereas Cr2O72- is reduced to Cr3+. Write an overall redox equation in an acidic medium.
[3 Marks]
ii. When 25.0 mL of 0.050 M iron (II) solution is titrated with 0.0069 M dichromate solution, calculate the volume of dichromate solution needed .
[2 Marks]
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