What is the density of oxygen gas, in g per liter, at 25 degree C A) 0.750 B) 0.

Question

What is the density of oxygen gas, in g per liter, at 25 degree C A) 0.750 B) 0.556 C) 1.33 D) 1.11 E) 0.901 At if given temperature and pressure, a sample of Gas A sample of a different gas, B. Based on this: A) The molar mass of A is 0.707 times that of B B) The molar mass of A is one half that of B C) The molar mass of A is one fourth that of B D) The molar mass of A is 1.414 times that of B E) The molar mass of A is four times that of B Which of the following frequencies corresponds to light A) 3.00 times 10^11 s^-1 B) 9.12 times 10^12 s^-1 C) 4.12 times 10^3 s^-1 D) 3.20 times 10^4 s^-1 E) 8.50 times 10^20 s^-1 An excess of sodium hydroxide is treated with 21.9 L of STP. What is the mass of sodium chloride formed? A) 0.114 kg B) 57.1 g C) 2.05 g D) 1.28 kg E) 10.9 g

Explanation / Answer

Answer 1)

On assuming O2 as an Ideal gas we have Ideal gas equation as,

PV = nRT.

n/V = P / RT

D = P/RT (as, n/V = D = molar density for O2)

With STP condition, P = 1 atm, R = 0.082 L.atm/mole.K. T = 25 oC = 298 K.

Using these values in above

D = 1 / (0.082 x 298) = 0.0409 moles/L

On multiplyin Molar density by Molar mass of O2 we get density of O2 gas as,

d = D x M

d = 0.0409 x 32

d = 1.31 g/L

Density of O2 gas at 25 oC is 1.31 g/L.

Answer option (C).

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