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A disposable tank of helium can be purchased to fill up balloons. Such tanks hold about 422 liters of helium compressed to 17.7 atm at room temperature (or 393K), and cost about $50. Use the ideal gas law (PV = nRT) to calculate the number of moles of Helium gas in the tank. For these units of pressure and volume, R = 0.0821 atm L/mol K.

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Answer:

231 moles

Explanation:

From the question, Given:

P = 17.7atm , V = 422litres , T = 393K , n = ? , R = 0.0821 atm L/mol K

We can rewrite the ideal gas equation making n the subject.

This is obtained as follows:

From PV = nRT, n = PV/RT

n = (17.7 × 422) ÷ ( 0.0821 × 393)

n = 231 moles

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