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Avogadro's Law states that equal volumes of gases at the same temperature and pressure contain equal numbers of particles.

To use Avogadro's Law in problems involving gases, we can use the formula V1/n1 = V2/n2, where V1 and V2 are the initial and final volumes of the gas, and n1 and n2 are the initial and final number of particles. This formula can be used to find the final volume or number of particles when given the initial volume or number of particles, or vice versa.

For example, if we have a gas with an initial volume of 2.5 L and 3.5 moles of particles, and we want to find the final volume when the number of particles is increased to 5.0 moles, we can use Avogadro's Law. Rearranging the formula to solve for V2, we get V2 = (n2/n1) x V1 = (5.0/3.5) x 2.5 = 3.57 L.

Avogadro's Law is also useful in determining the molar mass of a gas. By measuring the mass of a gas and its volume, we can calculate the number of moles of particles using the ideal gas law, PV = nRT. Then, by dividing the mass of the gas by the number of moles, we can find the molar mass of the gas.

In summary, Avogadro's Law is a useful tool in solving problems involving gases, particularly in determining the relationship between volume and number of particles.

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