none is is UUll vessel constant.) E) Answer gas initially contain temperature re

Question

none is is UUll vessel constant.) E) Answer gas initially contain temperature remain 39) If the number of of a pressure and volume of the in liters? the B) 1.05 C) 4.20 D) 8.40 above in a E) none of the of 836 mm Hg at 25.0°C Answers C g sample has a pressure 40) What is the molecular weight of a gas if a 21.0 2.00 L flask? (R L atm/ mol K) A) 243 amu B) 1.89 amu C) 234 amu D) 11.1 amu E) none of the above Answer: C STP? 41) What is the volume of 28.0 g of nitrogen gas at A) 33.6 L B) 11.2 L C) 22.4 L D) 44.8 L Answer: E) none of the above

Explanation / Answer

40)

Given:

Mass = 21 g

Pressure P = 836 mmHg = 836 / 760 = 1.1 atm

Temperature T = 25 C = 298 K

Volume = 2 L

R = 0.0821 L.atm/mol.K

P.V = n.R.T

1.1 atm * 2 L = n * 0.0821 L.atm/mol.K * 298 K

n = 0.0899 moles

Molecular weight = mass / no. of moles = 21 g / 0.0899 moles = 234 g/mol Answer

41)

Given

Mass of Nitrogen = 28 g

Molecular weight of Nitrogen = 28 g/mol

No. of moles of Nitrogen = Mass /mol. wt. = 28 g / 28 g/mol = 1 mol

STP means standard temperature pressure at STP

Pressure P =1 atm

Temperature T = 273 K

R = 0.0821 L.atm/mol.K

P * V = n* R * T

1 atm * V = 1 mol * 0.0821 L.atm/mol.K * 273 K

V = 22.4 L Answer

39th question is not properly visible if you can upload proper image of that we can answer that also

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