A 0.80 L sample of gas has a temperature of 27°C and a pressure of 0.925 atm. How many moles of gas are present?

n = 0.03 moles

Explanation:

Using the ideal gas law:

PV=nRT

nRT=PV

n = PV/RT

n: moles

P: pressure in atm

V = volume in L

R = Avogadro's constant = 0.0821

T = Temperature in K = > ºC+273.15

n = (0.925 atm) (0.80 L) / (0.0821) (300.15 K)

n = 0.03 moles