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

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

Explanation:

According to ideal gas equation:

P = pressure of gas = 1 atm (STP)

V = Volume of gas = 40.0  L

n = number of moles = ?

R = gas constant =

T =temperature =   (STP)

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

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