Agas is compressed from an initial volume of 5.40 l to a final volume of 1.20 l by an external pressure of 1.00 atm. during the compression the gas releases 128 j of heat. part a what is the change in internal energy of the gas?

296.2J

Explanation:

From the first law, you should know that the change in internal energy of a system is given by:

ΔE = q + w

where q is the heat added to the system (q is negative if heat is released from the system)

and w is the work done on the system by the surroundings.

We are told that q = -128 J.

Because the volume of the system decreases, the surroundings are doing work on the system, so w will be positive. If the compression is done "quasistatically", so that the internal pressure of the system is always infinitesimally close to the external pressure, then the work done is w = p*ΔV

1 atm = 1.01*10^5 Pa, and 1 liter = 10^-3 m^3, so:

w = (1.01^10^5 N/m^2)*(5.40 - 1.20)*10^-3 m^3

w = 424.2 J

The change internal energy is then:

ΔE = -128 J + 424.2J = + 296.2 J

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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it was given as a lesson and guide for prayer.