A candle is burnt in a beaker until it extinguishes itself- A sample of gaseous mixture in the beaker contains 6-08- 1020 molecules of N2- 0-76- 1020 molecules of O2- and 0-50- 1020 molecules of CO2- The total pressure is 734 mm of Hg- The partial pressure of O2 would be-

A sample of $O_{2}$ gas is collected over water at $23^{\circ}$ C at a barometric pressure of 751 mm Hg (vapour pressure of water at $23^{\circ}$ C is 21 mm Hg). The partial pressure of $O_{2}$ gas in the sample collected is ......

Q. A cylinder contains 0.3 mole

N_{2}

, 0.1 mole

O_{2}

and 0.1 mole

H e

. If the total pressure of gas mixture is 1 atmosphere, the partial pressure of

O_{2}

m m

H g

is:

Q. Assertion :Partial pressure of

O_{2}

in the alveoli is 104 mm Hg. Reason: Partial pressure of

O_{2}

is dependent upon concentration of

C O_{2}

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A candle is burnt in a beaker until it extinguishes itself. A sample of gaseous mixture in the beaker contains 6.08×1020 molecules of N2,0.76×1020 molecules of O2, and 0.50×1020 molecules of CO2. The total pressure is 734 mm of Hg. The partial pressure of O2 would be:

The correct option is C 76.0 mm of HgpO2=PTotal×χO2 (mole fraction of O2)χO2=nO2nO2+nN2+nCO2χO2=0.76×1020(0.76+0.50+6.08)×1020=0.767.34pO2=PTotal×χO2=734×0.767.34=76.0 mm of Hg.