An ideal gas at pressure, volume, and temperature, P0, V0, and ...

[melina_rosy]

An ideal gas at pressure, volume, and temperature, P₀, V₀, and T₀, respectively, is heated to point A, allowed to expand to point B also at As temperature 2T₀, and then returned to the original condition. The internal energy increases by 3P₀V₀/2 going from point T₀ to point A. How much heat entered the gas from point T₀ to point A?
 
   
   
  a.
  0
  b.
  P₀V₀/2
   
  c.
  3P₀V₀/2
  d.
  5P₀V₀/2

Question 2

As the ideal gas expands from pressure P₁ and volume V₁ to pressure P₂ and volume V₂ along the indicated straight line, it is possible that:
 
   
   
  a.
  the temperature stays constant.
   
  b.
  the internal energy decreases.
   
  c.
  the gas is changing state.
   
  d.
  all of the above are impossible for this particular graph.

[jesse.fleming]

Answer to Question 1

c

Answer to Question 2

d