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junior college 1 | H2 Maths
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Anyone out there knows how to solve this physics Ideal gases question?
Date Posted: 3 years ago
Views: 297
P1V1 / T1 = P2V2 / T2
Thxs for the solution! I would hv been stuck for hrs instead
You can also use the ideal gas law PV = nRT like the person who answered your question.
But then you'll realise that the R and n will eventually cancel out, which returns you to the combined gas law.
But then you'll realise that the R and n will eventually cancel out, which returns you to the combined gas law.
P1V1/T1 = P2V2/T2
You must ensure the temperature is in Kelvin.
As for pressure, it is okay to leave it in terms of atm here (but not for the ideal gas law, where it must be in Pascals (Pa)
Also remember that at sea level, pressure is 1 atm (sometimes questions might assume 1 bar)
(1)V1/293 = 0.68V2/278
278V1/(293 × 0.68) = V2
1.395 V1 ≈ V2
V2 = 1.40 V1 (3s.f)
Note that since we are comparing to sea level, we should be expressing V2 in terms of V1 and not V1 in terms of V2 (which is what Chee Wan did)
V1 is the reference here.
You must ensure the temperature is in Kelvin.
As for pressure, it is okay to leave it in terms of atm here (but not for the ideal gas law, where it must be in Pascals (Pa)
Also remember that at sea level, pressure is 1 atm (sometimes questions might assume 1 bar)
(1)V1/293 = 0.68V2/278
278V1/(293 × 0.68) = V2
1.395 V1 ≈ V2
V2 = 1.40 V1 (3s.f)
Note that since we are comparing to sea level, we should be expressing V2 in terms of V1 and not V1 in terms of V2 (which is what Chee Wan did)
V1 is the reference here.
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