Answer:
I think the correct answer is C.
1. molarity = (moles)/vol in litres
0.5=[(weight/40)*1000]/4
0.5 = weight/16
weight of NaOH = 8 grams
2. weight = 0.45*850*84/100 gms
molecular weight = 85m (not sure abt this)
They are all in forest climax means forest
I don't know how 5°C cooled to 85°C but the answer would be 12.878L