Naturally occurring strontium consists of four isotopes, Sr-84, Sr-86, Sr-87 and Sr-88. Below the data concerning strontium:
Sr-84 83.913 amu ,0.56%
Sr-86 85.909amu ,9.86%
Sr-87 86.909amu ,7.00%
Sr-88 ? ?

Based on the above information and the average atomic mass of Strontium, what is the mass a percent abundance of Strontium-88?

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?