Which equation represents a chemical equilibrium?
1)N2(l)<-->N2(g)
2)2NO2(g)<--->N2O4(g)
3)CO2(s)<-->CO2(g)
4)NH3(l)<--NH3(g)

2

Explanation:

the answer is number 2, 2NO2(g)<--->N2O4(g) is the same equation written twice

the answer is a. co2, this would be colder than the : )

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