Respuesta :

AStudentJustLikeYou
Well, O2 consists of 32 grams...
CH4 consists of 16 grams 
CO2 is 44 grams...
CI2 is 71 grams.

So, CH4 is the fastest. Hope this helped :) 
Dejanras

Answer is: CH₄ (methane).

The lighter (smaller) particles move more quickly than heavier (larger) ones at the same temperature.

Methane has smallest molecular mass in this example.

M(CH₄) = 16 g/mol; molecular mass of methane.

M(O₂) = 32 g/mol; molecular mass of oxygen gas.

M(CO₂) = 44 g/mol; molecular mass of carbon(IV) oxide.

M(Cl₂) = 71 g/mol, molecular mass of chlorine gas.

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