Please show all work and explain it.

The answer is -278.9kJ. Thank you

4. One mole of gaseous A is injected at 25C into a rigid reactor having a total constant volume of V=1L, and initially containing 2 moles of liquid B. The reactor is sealed and the following chemical reaction proceeds to completion (i.e. all A and B converts into C and D ), with the release of 285kJ of heat A(g)+2B()3C(s)+2D(g) At the completion of the reaction the temperature in the reactor is 500K. The molar volumes of liquid B at 25C and of solid C at 500K are 24mL and 14.2mL, respectively. What is H for this process? The vapor pressures of liquid B and solid C may be assumed to be negligible (i.e. the only role of liquid and solid is to occupy part of the reactor's volume)