The partial pressure is the pressure exerted by individual gas in the mixture. The total pressure of the tank is 5.95 atm.
According to the Dalton's law of vapor pressure, the total pressure of the gas is the sum of the partial pressure of individual gas in the mixture.
The tank has mixture of nitrogen and oxygen gas. The partial pressure of nitrogen gas ([tex]P_{N_2}[/tex]) is 1.61 atm, and the partial pressure of oxygen ([tex]P_{O_2}[/tex]) is 4.34 atm.
The total pressure of tank ([tex]P[/tex]) according to Dalton's law can be given as:
[tex]P=P_{N_2}+P_{O_2}\\P=1.61+4.34\;\rm atm\\\textit P=5.95\;atm[/tex]
The total pressure of the tank is 5.95 atm.
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