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Question

At STP, determine the amount of oxygen in liters that can be prepared from the decomposition of 212 grams of sodium chlorate(1 mol=106g).
  1. 11.2
  2. 22.4
  3. 67.2
  4. 44.8
  5. 78.4

A
11.2
B
44.8
C
22.4
D
67.2
E
78.4
Solution
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The molar mass of sodium chlorate is 106 g/mol.
Number of moles of sodium chlorate =212g106g/mol=2 mol
The decomposition reaction of sodium chlorate is as shown.
2NaClO32NaCl+3O2
The decomposition of 2 moles of sodium chlorate gives 3 moles of oxygen.
1 mole of oxygen at STP occupies a volume of 22.4 L.
3 moles of oxygen at STP will occupy a volume of 3×22.4=67.2 L.

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