Question #ad42b Chemistry Gases Molar Volume of a Gas 1 Answer P dilip_k Nov 21, 2016 Volume of oxygen at STP present in 2L air is #=2Lxx21%=0.42L# Number of moles of #O_2# present in # 0.42L# oxygen at STP will be #="volume of oxygen"/"molar volume of the gas"# #=(0.42L)/(22.4L/"mol")=18.75xx10^-3mol# Answer link Related questions How do stoichiometric ratios relate to molar volume of a gas? How do you calculate molar volume of a gas at STP? How do you find the molar volume of hydrogen gas? How do you calculate molar volume of oxygen gas? What is molar gas volume? What is the volume at 0 °C and 1 atm of a mixture that contains 4.0 g of methane and 2.0 g of helium? What is the difference between STP and NTP? What is the volume of .25 moles of oxygen (O2) Gas? Why would knowing the molar volume of a gas be important? Why is 22.4 liters called the molar volume of a gas? See all questions in Molar Volume of a Gas Impact of this question 1449 views around the world You can reuse this answer Creative Commons License