Question

Compare the root-mean-square speeds at 85oC of (a) O2 and O3, (b) F2 and Cl2, and...

Compare the root-mean-square speeds at 85oC of (a) O2 and O3, (b) F2 and Cl2, and (c) CH4 and CCl4

(a) As should be the case, the heavier gas, O3, has a ______ (Smaller or Greater) average velocity than the lighter gas, O2

(b) The heavier gas, Cl2, has a _______ (Smaller or Greater) average velocity than the lighter gas, F2.

(c) The lighter gas, CH4, has a _______ (Smaller or Greater) average velocity than the heavier gas, CCl4 .

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Answer #1

The root-mean-square speeds (RMS ) = 3RT/M

the root-mean-square speeds ( RMS) is inversely proportional to the squar root of molar mass of the gas.The heavier gas has smaller RMS than lighter gas

a) As should be the case, the heavier gas, O3, has a Smaller average velocity than the lighter gas, O2

(b) The heavier gas, Cl2, has a Smaller average velocity than the lighter gas, F2.

(c) The lighter gas, CH4, has a Greater average velocity than the heavier gas, CCl4 .

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