WHAT MY CHEM fIRENDS THNK i say its 2 and 3?

2021-03-10 2:17 pm
Which of the following concerning the ideal gas law is/are true?
  1. Pressure is directly proportional to volume when temperature and moles of gas are held constant.
  2. Pressure is directly proportional to moles of gas when temperature and volume are held constant.
  3. Volume is inversely proportional to temperature when the pressure and moles of gas are held constant.

1 only
2 only
3 only
1 and 2 only
2 and 3 only

回答 (1)

2021-03-10 2:39 pm
✔ 最佳答案
You are correct.

1. False
Gas law: PV = nRT, and thus  P = nRT/V  where R is a constant
Then T (temperature) and n (moles) are kept constant, P = constant/V
Hence, P (pressure) is INVERSELY proportional to V (volume)

2. True
Gas law: PV = nRT, and thus  P = (RT/V)n  where R is a constant
When T (temperature) and V (volume) are kept constant . P = constant × n
Hence, P (pressure) is directly proportional to n (moles of the gas).

3. True
Gas law: PV = nRT, and thus  V = (nR/P)T  where R is a constant
When P (pressure) and moles (n) are kept constant, V = constant × T
Hence, V (volume) is directly proportional to T (temperature).

The answer:  2 and 3 only


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