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

Question

Part A Calculate the density of oxygen, O2 , under each of the following conditions: ? STP ? 1.00 atm and 30.0 degree 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 30.0 degree C = Part B To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 2.0-L bulb, then filled it with the gas at 1.00atm and 30.0 degree C and weighed it again. The difference in mass was 2.3g . Identify the gas. Express your answer as a chemical formula.

Explanation / Answer

PM= dRT

d= PM/RT

   = 1*32/0.0821*303 = 1.28g/.lit

PV=WRT/M

M= WRT/PV

   =2.3*0.0821*303/1*2 =28

molecular mass = 28 gas is N2 or CO

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