How is h fusion used to calculate the mass of solid that 1 kj of energy will melt?

Answer : If in any reaction ΔH(fusion) is given we can consider its units;

ΔH(transition) has units (KJ/mol) and mass and molecular mass of that compound has unit mol/g and g respectively.

When we solved this, we get the units as KJ/mol which satifies the equation value for q.

So, q=n X ΔH (transition);

Hence, to find the mass of solid we can use the above equation.

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