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Question

Find the mass of oxygen contained in 1 kg of Potassium nitrate (KNO3)


A
475.5 g
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B
485.5 g
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C
475.2 g
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D
485.2 g
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Solution

The correct option is C 475.2 g

Molar mass of KNO3 = 39+14+48=101

% of O in KNO3 = 48101×100

so, mass of Oxygen in 1000 g

= 0.4752 x 100 = 475.2 g


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