Element X has three naturally occurring isotopes. The mass (amu) and % abundance of the isotopes are 37.919 amu (5.07%), 39.017 amu (15.35%), and 42.111 amu (79.58%). ... The isotopic masses and abundances are: 159.37 amu (30.60%), 162.79 amu (15. 79%), and 163.92 amu (53.61%).

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?