Helium does not usually react with other substances. does this mean that helium has no chemical properties? explain.

Which statement is true about ionic compounds?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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?