# Answer to Question #22401 in Inorganic Chemistry for Talia jackson

Question #22401

What is the number of moles in 500 L of He gas at STP?

Expert's answer

If you are given STP, you need to use temp and pressure in the calculation

PV = nRT

P = 1.00 atm

V = ????

n = 1 mol

R = 8.206 x 10^-2 L atm/mol K

T = 273.15 K

rearrange for V

V = nRT/P

plug in the above and you will get 22.4 L

If1 mole occupies --------------22.4 liters at STP

X mol will occupy 500 L atSTP

X =500L*1mole/22.4L = 22.3 mol

PV = nRT

P = 1.00 atm

V = ????

n = 1 mol

R = 8.206 x 10^-2 L atm/mol K

T = 273.15 K

rearrange for V

V = nRT/P

plug in the above and you will get 22.4 L

If1 mole occupies --------------22.4 liters at STP

X mol will occupy 500 L atSTP

X =500L*1mole/22.4L = 22.3 mol

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