Determine Molar Mass of Gas from Ideal Gas Graph
We are required to calculate the relative molecular mass or molar mass of the gas using its graph of P against 1/V.
Let's take a look at the Ideal Gas Equation:
P is pressure in Pa,
V is volume in m3,
n is moles of gas,
R is gas constant 8.31 J K-1 mol-1, and
T is temperature in K.
We need to rearrange this equation in terms of P as the y-coordinate and 1/V as the x-coordinate.
Therefore nRT will be the gradient of this graph.
We can then calculate the gradient from data given in the question.
Next we can equate nRT to this gradient and solve for molar mass M.
Therefore the answer to this question is option B.
Topic: Gaseous State, Physical Chemistry, A Level Chemistry, Singapore
Back to other previous Physical Chemistry Video Lessons.
Found this A Level Chemistry video useful?
Please LIKE this video and SHARE it with your friends!
Join my 10,000+ subscribers on my YouTube Channel for new A Level Chemistry video lessons every week.
Check out other A Level Chemistry Video Lessons here!
Need an experienced tutor to make Chemistry simpler for you?
Do consider signing up for my JC Chemistry Tuition classes at Bishan, weekly LIVE webinars or on-demand video lessons!