Which statement about gas effusion is true?

a. lighter gases effuse faster than heavier gases.

b. lighter gases effuse slower than heavier gases.

c. effusion is not related to the molar mass of gases.

d. light and heavy gases effuse at the same rate.

The correct answer is

A-  Lighter gases effuse faster than heavier gases

:)

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer