Problem:  The graph shown displays the effect of two different temperatures on the distribution of kinetic energies of molecules in a sample. One temperature is named "Lower T" and is graphed in blue. The other temperature is named "Higher T" and is graphed in red.If there was a third, new temperature that would be graphed in green and would display the effect of a greater, even higher temperature than "Higher T" on the distribution of kinetic energies of molecules in a sample, describe the shape and relative height of this new green curve as it relates to the existing red "Higher T" curve in the graph.

FREE Expert Solution

We’re being asked which gas has the largest molar mass at 25 ˚C.


In the graph, the y-axis is the fraction of molecules while the x-axis is the kinetic energy. According to the kinetic molecular theory of gases, the average kinetic energy of a gas is directly proportional to the temperature of the gas: a higher temperature results in a higher average kinetic energy.



Checking the graph:

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Problem Details


A graph has kinetic energy on the x-axis and fraction of molecules on the y-axis. Both axes are unscaled. Two hump-shaped curves are plotted; one for lower temperature and one for higher temperature. A vertical dotted line at the midway point of the x-axis is the minimum energy needed for the reaction, Ea. Both temperature curves peak to the left of the minimum energy needed, with only their right tails crossing this line. The lower temperature peak is higher and to the left of the higher temperature peak, but the tail of the higher temperature peak crosses the minimum energy line higher than the tail of the lower temperature peak, meaning that at higher temperatures a larger fraction of molecules react.


 The graph shown displays the effect of two different temperatures on the distribution of kinetic energies of molecules in a sample. One temperature is named "Lower T" and is graphed in blue. The other temperature is named "Higher T" and is graphed in red.


If there was a third, new temperature that would be graphed in green and would display the effect of a greater, even higher temperature than "Higher T" on the distribution of kinetic energies of molecules in a sample, describe the shape and relative height of this new green curve as it relates to the existing red "Higher T" curve in the graph.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Kinetic Molecular Theory concept. You can view video lessons to learn Kinetic Molecular Theory. Or if you need more Kinetic Molecular Theory practice, you can also practice Kinetic Molecular Theory practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Bartoszek Loza's class at OSU.