HELLO
Consider the mass % of CaO is 55,1%,
Then mass os CaO = 5.51
and mass of BaO = 4.49
So,
Number of gram equivalent of CaO = 5.51/28
Number of gram equivalent of BaO = 4.49/76.5
So
The sum of gram equivalents should be equal to 100 X 2.5
-------------
1000
= 0.25
thank you