Answer:

Explanation:
1 mol of Pb(MnO₄)₂contains 1 mol of Pb atoms.
1. Moles of Pb

2. Atoms of Pb

Answer: maybe 1.4 degrees higher than initial?
Not sure if all the needed info is here, I’m a bit rusty but I just tried to plug it into my calculator and got stuck. Anyway, the equation needed is Q=mcT, Q being energy, m mass, c spec. heat capacity and T as the change in temperature
I believe it the answer is 3412