3. How do we get mass from moles? A. multiply by Avogadro's number
B. multiply by molar mass
C. divide by Avogadro's number
D. divide by molar mass

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

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