10 g of a mixture of BaO and CaO requires 100cm^(3)of 2.5 M HCl to react completely. The percentageof calcium oxide in the mixture is approximately (Given : molar mass of BaO= 153)

10 g of a mixture of BaO and CaO requires 100cm^(3)of 2.5 M HCl to rea

1.	10 g of a mixture of BaO and CaO requires 100cm^(3)of 2.5 M HCl to react completely. The percentageof calcium oxide in the mixture is approximately (Given : molar mass of BaO= 153)
Answer» 52.6 55.1 44.9 47.4 Solution :`BaO+2HCl rarr BaCl_(2)+H_(2)O` `CaO+2HCl rarr CaCl_(2)+H_(2)O` REACTIONS show that 2 moles of MIX. of BaOand CaO requires 4 moles of HCl to react completely. HENCE, no. of moles of HCl `=(2.5xx100)/(1000)=0.25` moles `{:("Now,",HCl,BaO+CaO,),("Initial","4 moles","2 moles",),("Final","0.25 moles",""?,):}` No. of moles of MIXTURE of BaO and CaO `=(0.25xx2)/(4)=0.125` moles Let the mass of CaO be `x` G and BaO is `(10-x)` g Then, `(x)/(56)+(10-x)/(153)=0.125` [ Mol. mass f CaO `=56, BaO=153`] `153x+56(10-x)=0.125xx56xx153` `153x+560-56x=0.125xx56xx153` `97x=1071-560` `97x=511` `x=5.268` `:.%` of `CaO=(5.268)/(10)xx100=52.68%`