Asystem uses 49 j of energy to do work, and the change in internal energy is 58 j. how much heat was added to the system?
9 j

97 j

107 j

117 j

- 107 J

Solution:- The work done by the system is given as 49 J and the internal energy change is 58 J. It asks to calculate the heat added to the system.

It is based on first law of thermodynamics and the equation used is:

where w is the work done by the system or on the system. q is the heat energy added to the system or released by the system and is the internal energy change.

Since the work is done by the system, the sign of w is negative.

So, w = -49 J

= 58 J

q = ?

Let's plug in the values in the equation:

58 J = q - 49 J

on rearranging this:

q = 58 J + 49 J

q = 107 J

Hence, 107 J of heat is added to the system. Option three is correct.

chemists can use the electron cloud model to assign electrons to different atomic orbitals. atomic orbitals also explain the patterns in the periodic table

explanation:

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)