Use the atomic weight in the periodic table to determine the equivalent weight of magnesium.

The atomic weight of Magnesium (Mg) is about 24.305 g / mol.

Magnesium when forms an ion can donate two electrons hence forming Mg2+. Since it can donate two electrons, therefore it has an equivalence of 2 equivalence per mole, therefore:

equivalent weight = (24.305 g / mol) * (1 mol / 2 equivalence)

equivalent weight = 12.1525 g / equivalence

the answer would be c

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.