Chemistry Practice Problems Effusion Practice Problems Solution: A mixture of gaseous disulfur difluoride, dinitrog...

Solution: A mixture of gaseous disulfur difluoride, dinitrogen tetrafluoride, and sulfur tetrafluoride is placed in an effusion apparatus.(a) Rank the gases in order of increasing effusion rate.

Problem

A mixture of gaseous disulfur difluoride, dinitrogen tetrafluoride, and sulfur tetrafluoride is placed in an effusion apparatus.

(a) Rank the gases in order of increasing effusion rate.

Solution

Effusion is a process where a gas escapes from a container through a very tiny hole.

The rate of effusion of a gas decreases as its molar mass increases.


This is represented by the following relation:


<math xmlns="http://www.w3.org/1998/Math/MathML"><menclose mathcolor="#0000FF" notation="box"><mi>r</mi><mi>a</mi><mi>t</mi><mi>e</mi><mo>&#xA0;</mo><mi>o</mi><mi>f</mi><mo>&#xA0;</mo><mi>e</mi><mi>f</mi><mi>f</mi><mi>u</mi><mi>s</mi><mi>i</mi><mi>o</mi><mi>n</mi><mo>&#xA0;</mo><mo>=</mo><mo>&#xA0;</mo><msqrt><mfrac><mn>1</mn><msub><mi>M</mi><mrow><mi>g</mi><mi>a</mi><mi>s</mi></mrow></msub></mfrac></msqrt></menclose></math>


This means:

  • Higher the molar mass of a gas, lower the rate of effusion.


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