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E x (a course Home y: Module 9x Central Bucks School District C Secure https://session 87067861 and Solds Problem 8.17-Enhanced -with Feedback Problem 8.17 -Enhanced-with Feedback n. 860 mol A helium gas cylinder of the sort used to fil baloons has a volume of 140 L and a pressure of 2200 psi (150 atm) at 25 C My Answers Give Up Correct You may want to reference LDpages 236-238) Secion 8.10 while completing this The ideal gas law oquation, PV=nRT, alows you to calculate the moles of heim whe known variables, P. V. and T.First, rearrange the ideal gas law equation to isolate the u The temperature 25 C must be converted into kolvins using the expression T- 25 C can be caloulated by subettuting V- 140 L P-150 atm, T 298 K, and R- 0.C equation: (140 l)(150 0298 x) 860 m Part B How many grams of heium are in to ark? Express your answer using two significant figures Submit My Answers Give Up

Explanation / Answer

Gas law equation can be used to calculate the no of moles of helium gas.

The gas law eqaution can be written as PV=nRT

P= pressrue in atm = 150 atm V= volume of gas in L =140 L, T= temperature in K=25+273= 298K, R = gas constant =0.0821 L.atm/mole.K

n= PV/RT= 150*140/(0.0821*298)= 858.341 moles

moles of helium = mass of helium/ molar mass of helium

mass of helium= molar mass of helium* moles of heliun= 858.341*4 = 3433.364 gm =3.433 Kg

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