ideal equation of state

Question

Dinitrogen monoxide gas is collected at 32.0°C in an evacuated flask with a measured volume of 35.0L. When all the gas has been collected, the pressure in the flask is measured to be 0.340atm .

Answer 1

T = 32.0ºC + 273 = 305K

V = 35.0 L

P = 0.340 atm

n = ?

PV = nRT (ideal equation of state)

n = PV/RT

n = (0.340 atm)(35.0 L) / (0.0821 Latm/Kmol)(305K)

n = 0.475 moles