A mole of gas is equal to 6.02 x 1023 gas molecules.
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A mole of gas is a standard unit used in chemistry to represent a large number of particles of a gas, approximately 6.022 x 10^23 particles. It is equivalent to the number of carbon atoms in 12 grams of carbon-12. This number is known as Avogadro's number.
Hydrogen gas has the lowest mass per mole, with a molar mass of approximately 2 grams per mole.
The weight of a mole of an ideal gas depends on the specific gas being considered. The weight is given by the molar mass of the gas, which is typically expressed in grams per mole.
One mole of magnesium will react with two moles of hydrochloric acid to produce one mole of hydrogen gas. At standard temperature and pressure (STP), one mole of any gas occupies approximately 22.4 liters. Therefore, one mole of magnesium will produce 22.4 liters of hydrogen gas at STP.
A mole of anything has the same number of molecules as a mole of anything else. The why comes from the fact that this is the standard definition as agreed by scientists. We have to have standards for things to work. A mole of anything contains an Avagadro number of particles. That number is 6.022 x 1023
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