Select the gas with the largest root-mean-square molecular speed at 25°C. A)NH ₃ B)CO C)H ₂ D)SF ₆ E)All the gases have the same root-mean-square molecular speed at 25°C.

Question

Quizplus · Accepted Answer

The root-mean-square speed of a gas molecule is inversely proportional to the square root of its molar mass. Hydrogen (H₂) has the lowest molar mass among the options, thus it has the highest root-mean-square speed at a given temperature.

Select the Gas with the Largest Root-Mean-Square Molecular Speed at 25°C