Question

10gm of mno2 on reaction witb hcl forms 2.24 litres of cl2 at ntp,the % impurity of mno2 is

Answer 1

mno2 + 4jcl ---->mncl2 +2H2O

A/Q

moles of cl2 = 2.24 / 22.4 = 0.1 moles

now

A/ equation

1 mole cl2 react with 1 moles mno2
mole of mno2 =0.1
wt. of mno2=0.1*55=5.5g
impurity =10g-5.5g= 4.5g
%=4.4/10*100=45%.