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That is %purity of 10 g pyrolusite (mno2) went it react with hcl and liberat 0.1 equivalent cl2. .then that is %purity of mno2?? Plzz...... Ans me.. As soon as possible sir.

That is %purity of 10 g pyrolusite (mno2) went it react with hcl and liberat 0.1 equivalent cl2. .then that is %purity of mno2?? Plzz...... Ans me.. As soon as possible sir.

Grade:12th pass

1 Answers

Arun
25750 Points
5 years ago
According to the equation 1 mole of Cl2 is formed ffrom 1 mole of MnO2 
ie 22.4 L of Cl2 is formed from 87 g of MnO2 
 hence 2.24 L will be formed from 8.7 g of MnO2 
hence impurity in MnO2 is = 10 - 8.7 g =  1.3 g 
hence % impurity = 1.3  / 10  x 100 = 13%
note : in the question it is given the % impurity of manganese chloride which is not correct because it is 10 g of MnO2 not MnCl2 .
Regards
Arun (askIITians forum expert)

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