Please answer all parts and please answer them if you are sure. Thank you Part A

Question

Please answer all parts and please answer them if you are sure. Thank you

Part A Calculate the density of oxygen, 02, under each of the following conditions: STP 1.00 atm and 30.0 °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 30.0C = 1.43,1.29 g/L Submit Hints My Answers Give Up Review Part Correct When temperature increases, a gas expands and its densit y decreases. Part B To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 4.7-L bulb, then filled it with the gas at 1.80 atm and 30.0 °C and weighed it again. The difference in mass was 9.5 g . Identify the gas. Express your answer as a chemical formula. Submit Hints My Answers Give Up Review Part

Explanation / Answer

Part B:

We know that from ideal gas equation

PV = nRT

P = Pressure = 1.8 atm

V = volume = 4.7L

n = moles = mass / molecular weight = 9.5 g / mol wt

R = gas constant = 0.0821

T = temperature = 300C = 303 K

1.8 X 4.7 = 9.5 X 0.0821 X 303 / Mol wt

Mol weight = 27.9 = or 28 approx

the gas should be nitrogen with molecular formula N2

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