Answer:
22.3 mol
Explanation:
He is in STP conditions
This means that it is in standard conditions of temperature and pressure, under these conditions the pressure has a value of 1 atm and the temperature has a value of 273 K
To calculate the number of moles in 500L of He gas we use the ideal gas equation
[tex]P.V=n.r.T\\r(constant of ideal gases)= 0.082\frac{atm.L}{K.mol}[/tex]
We cleared the moles (n)
[tex]P.V=nr.T\\\frac{P.V}{r.T}=n\\\frac{1atm.500L}{0.082atm.L/K.mol.273K}=n\\\\22.3 mol=n[/tex]
The number of moles in 500 L of He gas at STP 22.3 mol
