What is the number of atoms per element with cr(nh3)6(no3)3

How many ions that have a +1 charge will bond with an ion that has a -2 charge

Calcium carbonate decomposes at high temperatures to give calcium oxide and carbon dioxide as shown below. caco3(s) cao(s) + co2(g) the kp for this reaction is 1.16 at 800°c. a 5.00 l vessel containing 10.0 g of caco3(s) was evacuated to remove the air, sealed, and then heated to 800°c. ignoring the volume occupied by the solid, what will be the mass of the solid in the vessel once equilibrium is reached?

Which of the following substances is the most soluble in water? a. sodium chloride b. methane c. bromine d. carbon