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Calculate the partial pressures of O 2 and H 2 in a mixture of 3 moles of

O 2 and 1 mole of H 2 at S.T.P.

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O 2 and 1 mole of H 2 at S.T.P.

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PV = nRT

at S.T.P. V = 22.4 L

T = 273 K

R = 0.0821 L atm K^-1 mol^-1

P = 4* 273*0.0821/22.4

= 4.002375 atm

partial pressure of O2 = 3*4.002375 / 4

= 3.0018 atm

partial pressure of H2 = 1*4.002375 / 4

= 1.0006 atm