Q.Give the Mathematical expression that relates gas volume and moles.

Avogadro's Law gives the mathematical relation between gas volume and moles: at constant temperature and pressure, the volume of a gas is directly proportional to the number of moles present, V ∝ n, i.e. V/n = constant.

Avogadro's Law (Avogadro's hypothesis) states that equal volumes of all gases, at the same temperature and pressure, contain equal numbers of moles (or molecules). This means volume and moles vary in direct proportion when T and P are held fixed:

V ∝ n (at constant T and P)

which can be written as:

V / n = constant

or, comparing two states of the same gas (or different gases) at the same T and P:

V1 / n1 = V2 / n2

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