If 20g of He gas has a volume of 0.4L and a pressure of 6 atm, what is the Kelvin temp?

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If 20g of He gas has a volume of 0.4L and a pressure of 6 atm, what is the Kelvin temp?

2006-12-22 05:54:22 · 2 answers · asked by janeeyre444 1 in Science & Mathematics ➔ Chemistry

2 answers

From the universal gas law PV = nRT

moles (n) = 20/4 = 5 mol of Helium
All other is given. Gas constant = 0.08205 (approx)
T = pV/(nR) = 6 x 0.4 /(5 x0.08295) = 5.85K

2006-12-22 06:02:59 · answer #1 · answered by docrider28 4 · 0⤊ 0⤋

Use the Ideal Gas Law: PV = nRT

where:
P = pressure (6 atm)
V = volume in liters (0.4L)
n = moles of He (change grams to moles by dividing by the atomic mass of He)
R = 0.0821 (since the pressure is in atm)
T = your unknown temp. (the answer will be Kelvin).

2006-12-22 16:15:20 · answer #2 · answered by The Old Professor 5 · 0⤊ 0⤋