Calculate the amount of magnesium in a 6 gram sample of this metal.

Given:
m (Mg) = 6 g

To find:
n (Mg) -?

1) Calculate the molar mass of Mg:
M (Mg) = Ar (Mg) = 24 g / mol;
2) Calculate the amount of Mg substance:
n (Mg) = m (Mg) / M (Mg) = 6/24 = 0.25 mol.

Answer: The amount of Mg substance is 0.25 mol.



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