Which of the following gases has the highest average speed at 400K?

Question

Which of the following gases has the highest average speed at 400K?

$A . N O_{2}$ $A. NO_2$
$B . O_{2}$ $B. O_2$
$C . F_{2}$ $C. F_2$
$D . C l_{2}$ $D. Cl_2$
According to my answer sheet, the correct answer is $A$ $A$ , but I don't understand why. From my understanding, shouldn't the gas with the lowest molar mass have the highest speed?

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Answer 1 · 2017-12-17T23:54:49

$B . O_{2}$ $B. O_2$ should be the correct answer for the reasoning given.

Explanation:

Just as you stated, the gas with the lowest molar mass should have the highest speed, and $O_{2}$ $O_2$ has the lowest molar mass. This relationship is true since $K E = \frac{1}{2} m v^{2}$ $KE = 1/2mv^2$ , so if the temperature, also known as the average kinetic energy, is constant, mass is inversely related to velocity.

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Which of the following gases has the highest average speed at 400K?

$A . N O_{2}$ $A. NO_2$
$B . O_{2}$ $B. O_2$
$C . F_{2}$ $C. F_2$
$D . C l_{2}$ $D. Cl_2$
According to my answer sheet, the correct answer is $A$ $A$ , but I don't understand why. From my understanding, shouldn't the gas with the lowest molar mass have the highest speed?

1 Answer

Explanation:

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Science

Math

Humanities

... and beyond

Which of the following gases has the highest average speed at 400K?

A. NO_2A.NO2A. NO_2 B. O_2B.O2B. O_2 C. F_2C.F2C. F_2 D. Cl_2D.Cl2D. Cl_2 According to my answer sheet, the correct answer is AAA, but I don't understand why. From my understanding, shouldn't the gas with the lowest molar mass have the highest speed?

1 Answer

Explanation:

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$A . N O_{2}$ $A. NO_2$
$B . O_{2}$ $B. O_2$
$C . F_{2}$ $C. F_2$
$D . C l_{2}$ $D. Cl_2$
According to my answer sheet, the correct answer is $A$ $A$ , but I don't understand why. From my understanding, shouldn't the gas with the lowest molar mass have the highest speed?