contestada

A chemical reaction occurs in a flask with an attached syringe the reaction absorbs 150 J of energy and as 25J of work on the syringe. Calculate the change in energy in joules of the system. Write the missing numbers in the boxes to complete the equation Q+W=

Respuesta :

Answer: 175 J

Explanation:

According to first law of thermodynamics:

[tex]\Delta E=Q+W[/tex]

[tex]\Delta E[/tex]=Change in internal energy

Q = heat absorbed or released

W = work done or by the system

W = work done on the system=[tex]-P\Delta V[/tex]  {Work done on the system is positive as the final volume is lesser than initial volume}

w = + 25 J

q = + 150 J   {Heat absorbed by the system is positive}

[tex]\Delta E=+25J+(+150)J=+175J[/tex]

Thus Q+W= +175 J

Otras preguntas