Using the graph below. determine the gas that has the lowest density at stp.

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Question 12

Using the graph below, determine the gas that has the lowest
density at STP.

500 1000 1500 2000 2500 Molecular Speed

D
C
All of the gases have the same density at STP
B
A

Answer

Answer – We are given the graph between
molecular speed versus relative number of particles.

We know lower molecular weight gas has high molecular speed,
mean lower mass of gas travelling faster than others. The gas with
high molecular mass have lower speed than lower mass of gas.

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We are also known as the molecular mass of gas is lower its
density also lower and higher molecular mass has a higher density.
From the graph we are getting that gas A has higher molecular
speed, thus gas A is with lower mass and lower density.

So, at STP condition gas A has lowest
density
.


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