nitric acid avery important industrial chemical.,is made by dissolving the gas NOx,in water. calculate the formula of gas,if at 1.24 atm and 50C density of gas is 2.15g/L.

We know,
 PV = nRTPV = wMRT             ( w is mass of gas, M is molar mass of gas)PM = wVRTPM = d x RT            ( d is density of gas)M = d x RTP    =2.15 x 0.08206 x 323  1.24         ( 50 degree C = 323 K)     = 46 g/mol

Now,
mass of N + x x mass of O = 46
  14 + 16 x = 46
                      x =   2

So, formula of gas = NO2

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