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Oxygen (O2) is produced through various chemical reactions and photosynthesis

A unit of measurement representing a specific number of molecules; equal to 6.022 x 10^23 molecules of oxygen.

The mass of 6 moles of oxygen gas, 192 grams.

The amount of oxygen in moles, equivalent to 2 moles.

Number of oxygen molecules in 9.6 kg, which is 4.2 * 10^25.

The mass of 3 * 10^22 oxygen molecules, which is 1.6 grams.

The volume occupied by 4.5 moles of oxygen gas at standard temperature and pressure (STP), 100.8 liters.

The volume occupied by 80 grams of oxygen at standard temperature and pressure (STP), in liters.

The number of oxygen molecules present in 1 liter of oxygen gas, in standard conditions, which is 2.5 * 10^23.

Density of oxygen gas in grams per litre at standard temperature and pressure (STP).

The chemical formula of iron(III) oxide, which contains oxygen.

Potassium permanganate is used to produce oxygen in a chemical reaction.

The electrolysis of 6 moles of water produces 67.2 liters of oxygen at STP (standard temperature and pressure).

If 16 liters of ozone are formed, then 24 liters of oxygen are used in the ozone production at STP.

Reacting 2 grams of hydrogen and 20 grams of oxygen will produce 18 grams of water.

Oxygen (O2) is a diatomic element, while ozone (O3) is a triatomic molecule, and hence they have different physical and chemical properties, like different molecular structures.

There are 12.04 x 10^23 molecules in 2 moles of water.

48 grams of oxygen will produce 96 grams of ozone .

Oxygen in the air is primarily produced from the process of photosynthesis.

If a gas has a relative density of 1.5 with respect to air, its relative molecular mass is 42.

Hydrogen (H)

Hydrogen exists as isotopes with masses 1 and 2.

A reaction that does not produce hydrogen gas.

Mixture of hydrogen and oxygen, 2 volumes of H2 and 1 volume of O2

A reaction that will not or should not produce hydrogen gas.

Water (H₂O) has the highest percentage of hydrogen.

Methane (CH₄).

Zinc (Zn) and Magnesium (Mg).

Electrolysis of water (H₂O) is a common industrial method.

Number of Neutrons in the nucleus.

Hydrogen is a colorless, odorless gas that is not a good electrical conductor and is poorly soluble in water.

The primary industrial method for producing hydrogen is by extracting it from natural gas.

A method unsuitable for laboratory hydrogen production involves using copper and a specific acid.

Hydrogen is significantly lighter than air, with a density substantially less than that of air.

There are three types of hydrogen isotopes: protium (¹H), deuterium (²H), and tritium (³H).

1 mole of sodium reacts with water to produce 0.5 moles of hydrogen gas.

CaH₂ (calcium hydride) is an example of a binary compound containing hydrogen.

Two moles of zinc reacting with hydrochloric acid will produce 1 mole of hydrogen gas.

For every 2 moles of aluminum reacting with hydrochloric acid, 3 moles of hydrogen gas are produced.

11.2 liters of hydrogen gas at standard temperature and pressure (STP) is equivalent to 1 mole.

The total number of coefficients in a chemical reaction equation.

The mass of water produced from 1 gram of hydrogen.

The molar relationship between 1 gram of hydrogen and the equivalent quantity of another element or compound.

A substance that does not react with hydrogen.

Hydrogen's lightness compared to air, expressed as a multiple.

Compounds composed of metal atoms and acidic radicals.

Compounds formed by hydrogen and acidic radicals.

Hydrogen gas is colorless.

Hydrogen is primarily found in compounds like water, not as a free element.

The scientist who first isolated hydrogen gas.

Hydrogen is a gas at room temperature.

Hydrogen is significantly lighter than many other gases.

Hydrogen reacts with some metals to form metal hydrides.

Hydrogen can be produced using the Kipp's apparatus.

Hydrogen is used to reduce metal oxides to their elemental form.

Hydrogen's density at room temperature is approximately 0.09 g/mL.

Hydrogen is considered a clean-burning fuel in many contexts.

Hydrogen does not directly react with acids in all cases.

Hydrogen gas is the lightest gas at equal volumes (50 liters).

Alkaline earth metal hydrides have a general formula of MeH₂.