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

Step-by-step solution

For the completely neutralization reaction, Let the mass of ( CaO ) in mixture is ( x ~g ) and that of BaO is ( 10-x g ) Now, The sum of the gram equivalents of ( CaO ) and ( BaO ) [ array l = 100 2.5 1000 =0.2 x 28 + 10-x 76.5 =0.25 76.5 x+280-28 x 28 76.5 =0.25 48.5 x=(0.25 25 76.5)-280 x= 255.5 48.5 =5.26 array ] Percentage of ( CaO ) in mixture is ( = 5.26 10 100=52.6 % )