Thallium consists of 29.5%ti-203 and 70.5%ti-205. what is the relative atomic mass of thallium?

Thallium atomic mass is 204.41.

Explanation:

TI-203 and TI-205 are isotopes of Thallium, it means elements that differs in the number of neutrons they have. To estimate the atomic mass of Thallium, you have to sum the mass of each isotope (203 or 205), multiplied by its abundance percentage and divided by 100&.

Thallium Atomic mass = [(203 x 29.5 %)/ 100%] + [(205 x 70.5 %)/100%]

⇒Thallium Atomic mass = 204.41.

Summarizing, Thallium atomic mass is 204.41.

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

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