What is the ratio of the average speed of He molecules to that of CH₄ molecules at 298 K? A)1:1 B)11:7 C)2:3 D)3:2 E)2:1

Question

Quizplus · Accepted Answer

The average speed of gas molecules at a given temperature is inversely proportional to the square root of their molar mass (Graham's law of effusion). The molar mass of He is approximately 4 g/mol, and the molar mass of CH4 (assuming "CH₄" is a typographical error for CH4) is approximately 16 g/mol. Therefore, the ratio of their speeds is the square root of (16/4) = 2, making the ratio of the speed of He to CH4 2:1.

What Is the Ratio of the Average Speed of He