Question

When 1mol of a gas burns at constant pressure, it produces 2430 j of heat and does 5 kj of work?

Answer 1

Convert  2430j  to  Kj  that  is  divide  by  1000 
2430/1000=2.430
delta  E  =Q+W
q is  the  heat  done  
w is  the  work done and  since  is work  is  done is by  the  system therefore  it  is  negative
w  is  therefore -5kj
q=-2.430
delta E =-2.430 + -5= -7.43kj/mol