Acylinder and piston assembly is warmed by an external flame. as a result, the system absorbs 559 j of heat. the contents of the cylinder expand and perform 488 j of work during the expansion. what is the change in internal energy of the system?

U = 71 J

Explanation:

given,                                      

system absorb heat = 559 J                              

Work done during expansion =  488 J                

First law of thermodynamics state that energy can neither be created nor be destroyed.                                                          

Apply First law of thermodynamics:  

       Q - H = U

where                            

        Q = +559 J            

          W = 488 J        

          U = Q - H            

          U = 559 - 488

          U = 71 J                    

The change in internal energy is equal to   U = 71 J

a.   mass number from atomic number