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astraxan [27]
3 years ago
5

Five hundred joules of heat are added to a closed system. The initial internal energy of the system is 87 J, and the final inter

nal energy is 134 J. How much work is being done by the system?
A) 221 J
B) 279 J
C) 366 J
D) 453 J
Physics
2 answers:
mina [271]3 years ago
8 0
The answer is D. i got all the other ones wrong ._.

timurjin [86]3 years ago
6 0
<h3><u>Answer;</u></h3>

453 Joules

<h3><u>Explanation;</u></h3>
  • The change in internal energy = Final energy -initial energy

       = 134 J - 87 J

          = 47 Joules

  • Energy added to the closed system is 500 joules
  • Work done = energy added to the system -Change in internal energy

                  = 500 Joules - 47 Joules

                   = 453 joules

The work done is therefore,<em><u> 453 joules.</u></em>


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Givens
=====
V = 4.00 L
T = 273oK We're assuming the temperature does not change, just the pressure.
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Formula
======
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P = 490 kpa


You have to add 1.6 – 0.864 = 0.736 moles of gas.


We have to assume that the temperature and pressure remain the same when we add the 0.736 moles of gas. We are now looking for the volume.


PV = n*R*T

<span> V = 0.736 * 8.314 * 273 / 490</span>

V = 3.41 L Remember this is at about 4 atmospheres so we have to convert to Standard Pressure.

Total Volume = 3.41 + 4.00 = 4.41


V1 * P1 = V2 * P2

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P2 = 101 kPa

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