Answer:
The correct option is;
D.) The molecular masses of the gases, because the gas molecules have the same average kinetic energy and mass can be calculated using the equation,
Explanation:
The graph shows the proportion of the atoms of each gas have a given velocity
The given parameters of the graphs are;
The dependent variable of the graph = The number of molecules
The independent variable = The molecular speed (m/s)
The temperature of the gases = The same temperature
Therefore, from the above equation, at constant temperature, the root mean square velocity varies inversely as the molecular weight
Similarly from the kinetic energy equation, we have;
Whereby, the energy contained in each of the four gas are the same, we have;
For increasing molecular mass by a factor of 2, the velocity decreases by a factor of 4.