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What is the number of moles in 40.0 L of He gas at STP?

Sagot :

Answer: There are 1.78 moles in 40.0 L of He gas at STP

Explanation:

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = 1 atm (STP)

V = Volume of gas = 40.0  L

n = number of moles = ?

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]273K[/tex]   (STP)

[tex]n=\frac{PV}{RT}[/tex]

[tex]n=\frac{1atm\times 40.0L}{0.0821Latm/K mol\times 273K}=1.78moles[/tex]

Thus there are 1.78 moles in 40.0 L of He gas at STP

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