What is the mass of a piece of pier magnesium if 1 mol magnesium over one mold H2
It is not possible to determine the mass of a piece of pier magnesium without specific measurements or additional information. The chemical equation provided only states the molar ratio of magnesium to hydrogen gas (H2), but does not give a specific mass.
To calculate the mass of magnesium, you would need to know the molar mass of magnesium (about 24.3 g/mol) and the number of moles present in the sample. From there, you can calculate the mass using the equation:
mass = number of moles x molar mass
Without more information, it is not possible to provide a specific mass for the piece of magnesium.