Explain how you would use Avogadro’s law given the grams of known compound and volume.

Answer 1

Two ways to express Avogadro's Law are:

Equal volumes of gases have the same number of molecules (moles) @ the same temperature and pressure.

Equal moles of gases @ the same temperature and pressure have the same volume.

Now, without knowing your exact question, it's difficult to answer you precisely. If you know the mass and volume of a known gas, then you can relate these variables to an unknown gas as long as the temperature and pressure are the same.

Answer 2

Avogadro's law states that for a gas at constant temperature and pressure, the volume is directly proportional to the number of moles. A common place where that would come up in the situation you are describing is where you have a comparative scenario with two different substances. In that context you could use V1/n1 = V2/n2 in order to solve for a missing value.