Part A Calculate the density of oxygen, O2, under each of the following conditio

Question

Part A Calculate the density of oxygen, O2, under each of the following conditions:•STP •1.00 atm and 10.0 C Express your answers numerically in grams per liter.

Enter the density at STP first and separate your answers by a comma. density at STP,

density at 1 atm and 10.0 C =

Part B To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 7.5-L bulb, then filled it with the gas at 1.10 atm and 22.0 C and weighed it again. The difference in mass was 9.5 g . Identify the gas.

Express your answer as a chemical formula.

Explanation / Answer

part-A

   PM = dRT

   P   = 1atm

T    = 10C0 = 10+273 = 283K

M   = 32g/mole

PM = dRT

d   = PM/RT

      = 1*32/0.0821*283   = 1.377g/L

part-B

     Pv =nRT

    n   = W/M

   PV = WRT/M

   M    = WRT/PV

         = 9.5*0.0821*295/1.1*7.5   = 28g/mole >>>> N2

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