Solve - 16g of oxygen gas is enclosed in aa 1 dm3 flask at 25 degree celsius . Calculate the pressure exerted by the gas if the molecular mass of any gas occupies 22.4 litres at STP.

Dear Student,

Please find below the solution to the asked query:

Given mass of oxygen = 16g
Molar mass of Oxygen gas = 32g/mol
No.of moles of Oxygen = 16/32
                                   n    = 0.5mol

Given Volume = 1dm³ = 1L = 1 $\times$10^-3m^3
​       Gas constant , R = 8.314JK^-1mol^-1
                               T = 298K

​Substituting the values in the equation:
                          P = $\frac{nRT}{V}$
We get,             P =  $\frac{0.5\times 8.314\times 298}{1\times {10}^{-3}}$
                          = 1238 $\times$ 10³Pa
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