0.250 L 0.980 L 136.8 kPa expand work (J)
A fuel is burned in a cylinder equipped with a piston.
The initial volume of the cylinder is 0.250 L,
and the final volume is 0.980 L.
If the piston expands against a constant pressure of 136.8 kPa,
how much work (in J) is done?
---------------------------------------------------
w = –PΔV
( 참고 https://ywpop.tistory.com/6336 )
= –(136800 Pa) (0.980 – 0.250 L)
= –99864 Pa•L
1 m3 = 1000 L 이므로,
(–99864 Pa•L) (1 m3 / 1000 L)
= –99.864 Pa•m3
1 Pa•m3 = 1 J 이므로,
–99.864 Pa•m3 = –99.864 J
또는
1 atm = 101325 Pa 이므로,
(136800 Pa) (1 atm / 101325 Pa)
= 1.350 atm
w = –PΔV
= –(1.350 atm) (0.980 – 0.250 L)
= –0.9855 atm•L
1 atm•L = 101.325 J 이므로,
(–0.9855 atm•L) (101.325 J / 1 atm•L)
= –99.856 J
답: –99.9 J
0.250 L 0.980 L 1.35 atm expand work (J)
A fuel is burned in a cylinder equipped with a piston.
The initial volume of the cylinder is 0.250 L,
and the final volume is 0.980 L.
If the piston expands against a constant pressure of 1.35 atm,
how much work (in J) is done?
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