How much of a 24-gram sample of Radium-226 will remain unchanged at the end of three half-life periods?

The right answer is "3 g".

Explanation:

Given:

Initial mass substance,

By using the relation between half lives and amount of substances will be:

⇒

Thus, the above is the correct answer.

one state would change   like louisiana to texas. thats a change

explanation:

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml