Of these gases, which has the fastest-moving molecules (on average) at a given temperature?

Question

Chemistry

Makayla Greene

27 October, 21:58

Of these gases, which has the fastest-moving molecules (on average) at a given temperature?

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Answers (1)

Know the Answer?

Theresa Charles · Answer 1

I believe we are choosing between HBr, NO2, and C2H6.

The molar masses of these compound are:

Molar mass of HBr = 80.9119

Molar mass of NO2 = 46.005

Molar mass of C2H6 = 30.0694

The speed of the molecule actually is inversely proportional to its molar mass. Hence, the lighter the molecule, the faster it moves.

Answer:

C2H6 (ethane)