How many moles of He (g) are in a 5 L storage tank filled with He at 10.5 atm pressure and 30°C?

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How many moles of He (g) are in a 5 L storage tank filled with He at 10.5 atm pressure and 30°C?

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Answer 1 · 2016-12-28T20:58:26

Approx. $2 \cdot m o l$ $2*mol$

Explanation:

$n = \frac{P V}{R T} = \frac{10.5 \cdot a t m \times 5 \cdot L}{0.0821 \cdot L \cdot a t m \cdot K^{- 1} \cdot m o l^{- 1} \times 303 \cdot K}$ $n=(PV)/(RT)=(10.5*atmxx5*L)/(0.0821*L*atm*K^-1*mol^-1xx303*K)$

$= ? ? m o l$ $=??mol$

The only difficulty with these sorts of problems is selecting the right gas constant $R$ $R$ .

Chemists tend to use $R = 0.0821 \cdot L \cdot a t m \cdot K^{- 1} \cdot m o l^{- 1}$ $R=0.0821*L*atm*K^-1*mol^-1$ , because the units of $litres$ $"litres"$ and $atmospheres$ $"atmospheres"$ are convenient. Note that you really don't have to remember them because they should be provided to you in an exam.

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How many moles of He (g) are in a 5 L storage tank filled with He at 10.5 atm pressure and 30°C?

1 Answer

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