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<u>Answer:</u> The partial pressure of helium gas is 0.80 atm
<u>Explanation:</u>
Dalton's law of partial pressure states that the total pressure of the system is equal to the sum of partial pressure of each component present in it.
To calculate the partial pressure of helium gas, we use the law given by Dalton, which is:
We are given:
Total pressure of the cylinder, = 1.00 atm
Vapor pressure of oxygen gas, = 0.20 atm
Putting values in above equation, we get:
Hence, the partial pressure of helium gas is 0.80 atm