Chapter 1 2020/2021
Chapter 1 2020/2021
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a) Sodium metasilicate, Na2SiO3, is used in the production of silica gel.
i. Write the isotopic notation for silicon atom.
[1 Mark]
ii. Calculate the number of Si atoms in 50 g of Na2SiO3 .
[2 Marks]
b) The following reaction takes place in an acidic conditions
MnO4- + Fe2+ → Mn2+ + Fe3+
Balance the redox reaction.
[3 Marks]
c) Compound X has a molar mass of 294.20 gmol-1. Analysis of X shows that it contains 26.58 g of potassium, 35.35 g of chromium and 38.07 g of oxygen. Determine the molecular formula and name X.
[6 Marks]
d) The reaction between nitrogen dioxide, NO2, with water produces nitric acid, HNO3 and nitrogen monoxide, NO. In a reaction between 100.0 g of NO2 and 50.0 g of water, 80.0 g of HNO3 is produced
i. Determine the limiting reactant for this reaction.
[6 Marks]
ii. Determine the percentage yield of this reaction.
[3 Marks]
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