Question

78. The partial pressure of oxygen in air is 22 kPa.
What is the oxygen content in percent volume?
(1) 42%
(2) 21.7%
(3) 11%
(4) 5.5%​

Answer 1

Answer:

11%

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Answer 2

The percentage of oxygen content is (2) 21.7 %.

Given: The partial pressure of oxygen in the air is 22 kPa.

To Find: The percentage of oxygen content.

Solution:

• Partial pressure is the pressure exerted by a (specified) component in a mixture of gases.
• Partial pressure is the component of total pressure associated with a specific gas species, while the total pressure is the sum of partial pressures for all gas species contributing to a particular location where the pressure is measured.

We know that,

      Pressure P (total) = 1 atm = 10^5 / 0.987 pascal ( Pa )

                                      = 101.317 kPa

Now, we are given that Pressure P (oxygen) = 22 kPa

So, Percent volume of oxygen =  (P (oxygen) / P (total)) × 100

                                                   =  ( 22 / 101.317 ) × 100

                                                   = 21.7 %

Hence, the percentage of oxygen content is (2) 21.7 %.

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