A piece of plastic has a mass of 6.9 kg and a volume of 722 cm3. What is its density in g/cm3?

9.55 g/cm3

Explanation:

mass= 6900 g

volume= 722cm3

density= mass/ volume

density = 6900/722

density= 9.55 g/cm3

if you're asking what comes out, it's steam.

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