At `27""^(@)`C 100mL of 0.1 M radium chloride is `10""^(-3)` Curies active. The activity of 500mL of 0.2 M radium phosphate solution at `77""^(@)`C is `"x"xx10""^(-2)` Curie then 'x' is

Answer

3

Explanation

m moles of radium in `RaCl""_(2)` is 10 and its activity is `10""^(-3)` Curie.
m mole of radium in `Ra""_(3)(PO""_(4))""_(2)` is
`500xx0.2xx3=300` So its activity is `3xx10""^(-2)`Curie.