Calculate the mass of Na2O needed to release 105 kJ of heat energy according to the following reaction: Na2O (s) + 2HI (g) → 2NaI (s) + H2O (l) ΔH = -502 kJ

13.0 g
155 g
97.4 g
24.8 g

Find the number of moles of argon in 364g of argon.

One nanometer is equal to how many meters?

28. which is not a reason that water is used to store spent fuel rods from nuclear power plants? water increases the speed of the chain reaction in the fuel rods. water protects nuclear power plant workers from the high temperature and radiation of the fuel rods. water acts as a radiation shield to reduce the radiation levels. water cools the spent rods. salts action