Consider the graph below comparing the velocity distribution of the same molecule at three different temperatures (25°C, 50°C and 75°C). Identify which curve represents the gas at 50°C.

Identify which molecule has the higher molar mass and which has the higher rate of effusion based on the molecular velocity distribution shown below.

Legend:

Molecule X → blue

Molecule Y → yellow

Which of the following statements is/are TRUE based on the figure below? Assume at a constant temperature.

I) Gas D has the largest molar mass.

II) Gas B has a larger molar mass than gas C.

III) Every molecule of gas A is slower than every molecule of gas D.