The temperature of low pressure hydrogen is reduced from 100°C to 20°C.The rms speed of its molecules decreases by approximately:
A)89%
B)79%
C)46%
D)21%
E)11%

Question

Quizplus · Accepted Answer

The root mean square (rms) speed of gas molecules is proportional to the square root of the temperature in Kelvin. Converting the temperatures from Fahrenheit to Kelvin and calculating the change in rms speed shows a decrease of approximately 11%.

The Temperature of Low Pressure Hydrogen Is Reduced from 100°C