Anew element -- quickly named swiforskium by the scientific community -- is discovered. this element is found to have two isotopes. 86.4% of all swidorskium atoms are swidorskium-428 and 13.6% are swidorskium-433. what is the atomic mass of this element? show your work.

The average  atomic mass of this element is 428.68 .

Explanation:

Average atomic mass =

Atomic mass of Swidorskium-428 = 428

Abundance of Swidorskium-428 = 86.4%=0.864

Atomic mass of Swidorskium-433. = 433

Abundance of Swidorskium-433 = 13.6= 0.136

The atomic mass of the element is

= (atomic mass of Swidorskium-428 )(abundance) + (atomic mass of Swidorskium-433)(abundance)

The atomic mass of Swidorskium = (428)(0.864)+(433)(0.136) = 428.68

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

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.