What is the enthalpy change for this reaction

CH4 + 4Br2 -> CBr4 + 4HBr

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.

that's what i got you can count the number of atoms