A tank at is filled with of sulfur tetrafluoride gas and of sulfur hexafluoride gas. You can assume both gases behave as ideal gases under t

Question

A tank at is filled with of sulfur tetrafluoride gas and of sulfur hexafluoride gas. You can assume both gases behave as ideal gases under these conditions. Calculate the mole fraction of each gas. Round each of your answers to significant digits.

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RuslanHeatt 4 years 2021-07-19T06:58:34+00:00 1 Answers 5 views 0

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  1. thanhcong
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    2021-07-19T06:59:56+00:00
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    The question is incomplete, the complete question is:

    A 7.00 L tank at 21.4^oC is filled with 5.43 g of sulfur hexafluoride gas and 14.2 g of sulfur tetrafluoride gas. You can assume both gases behave as ideal gases under these conditions. Calculate the mole fraction and partial pressure of each gas. Round each of your answers to significant digits.

    Answer: The mole fraction of sulfur hexafluoride is 0.221 and that of sulfur tetrafluoride is 0.779

    Explanation:

    The number of moles is defined as the ratio of the mass of a substance to its molar mass.  The equation used is:

    \text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}} ……(1)

    • For sulfur hexafluoride:

    Given mass of sulfur hexafluoride = 5.43 g

    Molar mass of sulfur hexafluoride = 146.06 g/mol

    Putting values in equation 1, we get:

    \text{Moles of sulfur hexafluoride}=\frac{5.43g}{146.06g/mol}=0.0372mol

    • For sulfur tetrafluoride:

    Given mass of sulfur tetrafluoride = 14.2 g

    Molar mass of sulfur tetrafluoride = 108.07 g/mol

    Putting values in equation 1, we get:

    \text{Moles of sulfur tetrafluoride }=\frac{14.2g}{108.07g/mol}=0.1314mol

    Total moles of gas in the tank = [0.0372+ 0.1314] mol = 0.1686 mol

    Mole fraction is defined as the moles of a component present in the total moles of a solution. It is given by the equation:

    \chi_A=\frac{n_A}{n_A+n_B} …..(2)

    where n is the number of moles

    Putting values in equation 2, we get:

    \chi_{SF_6}=\frac{0.0372}{0.1686}=0.221

    \chi_{SF_4}=\frac{0.1314}{0.1686}=0.779

    Hence, the mole fraction of sulfur hexafluoride is 0.221 and that of sulfur tetrafluoride is 0.779

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