Q. 65.0( 1 Vote )

Figure shows graphs of pressure vs density for an ideal gas at two temperatures T1 and T2.



A. T1 > T2

B. T1 = T2

C. T1 < T2

D. Any of three is possible

Answer :

From the graph, we can see that slope of straight line with temperature


T1 is greater than slope of straight line with temperature T2.


Slope of straight line is given as:


Slope =


In our graph, slope is


where P=pressure


= density of gas


So, ratio for T1 is more than T2.


Rms speed of gas is given as



where R=gas constant whose value is 8.31 J/mol K.


T=temperature of gas.


M= molar mass of molecule of gas


We also know that ideal gas equation is


PV=nRT


Where V= volume of gas


R=gas constant


T=temperature


N=number of moles of gas


So, we can write .


Putting the value of RT in equation (i),we get



nM= total mass of gas ‘m’


and density =


Putting the value of density in equation (ii), we get



Since ratio for T1 is more than T2 therefore rms speed for ideal gas at temperature T1 is more than temperature T2. And if rms speed is more for temperature T1 then T1 > T2 from formula


vrms =

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