Does it take more energy to heat the water to 100°C or to boil it?

Which substance can be broken down by chemical means

You dissolve 8.65 grams of lead(l) nitrate in water and then you add 2 50 grams of aluminum. this reaction occurs 2ai(s)+ 3pb(no3)2(aq) -3pb(s)+ 2aino3la(aq) the theoretical yield of solid lead?

Why sncl2 is solid while sncl4 is liquid at room temprature explain it in easy way