Energy cannot be created nor destroyed, but it can be transformed between a syst
ID: 495122 • Letter: E
Question
Energy cannot be created nor destroyed, but it can be transformed between a system and its surroundings. The change in internal energy. Delta E, is positive if the system absorbs energy and it is negative if the system released energy. (Figure 1). The total change in internal energy is the sum of the heat, q, and work, w: Delta E = q + w. The change in internal energy Delta E is a state function because it depends only on the initial and final states of the system, and not on the path of change in contrast q and w are path functions because they depend on the path of change and not just the initial and final states of the system. An ideal gas (with is is a hypothetical gas that conforms to the laws governing gas behavior) confined to a container with a massless piston at the top. (Figure 1) A massless wire is attached to the piston. When an external pressure of 2.00 atm is applied to the gas compresses from 6.60 to 3.30 L. When the external pressure is increased to 2.50 atm, the gas further compresses from 3.30 to 2.64 L In a separate exponent with the same initial conditions, a pressure of 2.50 atm is applied to the wire, the compresses from 6.60 to 3.30 L. When the external pressure is increased to 2.50 atm, the gas further compresses from 3.30 to 2.64 L In a separate experiment with the same initial conditions, a pressure of 2.50 atm was applied to the ideal gas, decreasing its volume from 6.60 to 2.64 L in one step. In a separate experimentation with the same for both processes, what is the difference between q for the two step process and q for one step process in joules?Explanation / Answer
work done in two step process :
q1 = W1 + W2
= - Pext (V2 - V1 ) + (-Pext) (V3 - V2)
= - 2 x (3.30 - 6.60) + - 2.50 (2.64 - 3.30)
= 6.60 + 1.65
= 8.25 l.atm
= 836 J
work done in 1 step process
q2 = - Pext (V2 - V2)
= - 2.50 x (2.64 - 6.60)
= 9.90 L.atm
= 1003 J
difference :
q1 - q2 = 836 - 1003
= - 167 J
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.