Gas properties experiment At constant temperature, if n represents the moles of
ID: 489044 • Letter: G
Question
Gas properties experiment At constant temperature, if n represents the moles of gas present, what would be the expected relationship between pressure (P) and the number of moles of gas (n). Based on the relationship between P, T, n and V, state a combined gas law connecting all the four variables using a new proportionality constant, K. Justify your answer. From your plot of pressure vs. temperature, why is the unit of temperature in the gas equation reported in Kelvin? What would happen if degrees Celsius were used? Identify the three gas laws covered in this experiment. Describe the relationship observed in each law. Then, describe the relationship observed in the experiment. Do your findings support the gas laws? If not, explain why. In Part III, as you placed the apparatus in the warm water bath, you should have noticed the volume of air in the syringe increased. Explain what has happened to the gas. What variable should have remained constant?
Explanation / Answer
According to ideal gas equation -
PV = nRT
P = pressure of gas
V = volume of gas
n = number of moles of gas
T = temperature of gas
Let there be a gas at pressure P1 , volume V1 , moles n and temperature T.
P1V1 = nRT
Let the pressure change to P2 , volume to V2 but moles are constant to n and temperature to T.
P2V2 = nRT
From the above two equations we get the required relation-
P1V1 = P2V2
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