Which is the density of oxygen and air

Oxygen, because the main component of air is nitrogen, the density of air is closer to that of nitrogen. The mole mass of oxygen is 32, and the mole mass of nitrogen is 28, so the density of air is less than that of oxygen (about 29 for air)

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1. Under standard conditions, the density of oxygen is 1.429 g / L and that of air is 1.293 g / L Find (1) what is the mass fraction of oxygen in the air (2) mass ratio of oxygen to nitrogen in air (take integer ratio)
2. It is known that the density of oxygen is 1.429g/l and that of air is 1.293g/l. The mass fraction of oxygen in air (density = mass / volume) is calculated
3. The volume ratio of nitrogen to oxygen in air is about 1:4. It is known that under the standard condition, the density of nitrogen is 1.250 g / L-1, and that of oxygen is 1.429 g / - 1, Calculate the mass ratio of nitrogen and oxygen in air
4. How many grams of oxygen can be produced by heating 15.8 grams of potassium permanganate to decompose it completely? What is the volume of oxygen under standard conditions (density is 1.429 g / L)?
5. The oxygen contained in a steel cylinder is 8kg / m3. If a quarter of it is used in one welding, what is the density of the remaining oxygen in the cylinder Kilogram per cubic meter? Isn't density a property of matter? Why not 8?
6. If a certain amount of oxygen is contained in a steel cylinder, and 1 / 3 of it is used in one welding, the mass of the remaining oxygen in the cylinder is the same as the original______ Times the original density______ Times
7. There is a steel cylinder with oxygen of mass m and density ρ. When oxygen of mass m / 4 is used, the remaining gas density in the cylinder is 0
8. When v = 10m3, ρ = 1.43kg/m3, then the functional relationship between ρ and V is______ ．
9. For a certain mass of gas, its density p is the inverse proportional function of its volume V. When v = 10 cubic meters, P = 1.291 1. Finding the functional relationship between P and V 2. If v = 6.45M & # 179, the density of the gas can be obtained
10. The density of oxygen contained in a steel cylinder is 8 kg / m3. If one quarter of the oxygen is used for one welding, the density of the remaining oxygen in the cylinder is 0
11. The air density is 1.293g/l and the oxygen density is 1.429g/l. According to the volume fraction of oxygen in the air, what is the mass fraction of oxygen in the air?
12. How many kilograms of ozone can one kilogram of oxygen produce? How much air can one kilogram of oxygen be produced?
13. What are the combustion phenomena of carbon in air and oxygen?
14. The volume ratio of oxygen and nitrogen in the air is 21:78. How many cubic meters of oxygen and nitrogen are there in 660 cubic meters of air?
15. The volume ratio of oxygen and nitrogen in the air is 21:78.660 cubic meters. How many cubic meters of oxygen and nitrogen are there in the air?
16. The volume ratio of oxygen and other gases in the air is 21:79.1320 cubic meters. How many cubic meters of oxygen are there in the air?
17. How many cubic meters is one oxygen bottle
18. How many liters is a cubic meter
19. One ton of liquid oxygen and how many cubic meters of oxygen
20. The cube of x equals x, what is x equal to? Just the right answer