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Question

1.42 g of sodium sulphate dissolved in water was treated with excess of BaCl2 solution and 1.167 g of BaSO4 was obtained. Calculate the percentage yield of the reaction.
Molar mass of sodium sulphate and barium sulphate is 142 g/mol and 233.4 g/mole respectively.

A
100%
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B
50%
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C
75%
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D
90%
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Solution

The correct option is B 50%
Given
Na2SO4+BaCl22NaCl+BaSO4
Mass of sodium sulphate = 1.42 g
Moles of sodium sulphate =1.42142=0.01
Theoretical yield of barium sulphate = 0.01
Mass of barium sulphate obtained = 1.167 g
Moles of barium sulphate = 1.167233.4=0.005
Percentage yield = experimental yieldtheoretical yield×100=0.0050.01×100=50%

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