1) list the number of protons, neutrons, and electrons in carbon-13. 2) a fictitious element x is composed of 10.0 percent of the isotope x-55, 20.0 percent of the isotope x-56, and 70.0 percent of the isotope x-57. calculate the weighted atomic mass of element x to the nearest tenth. with both questions and show all work!

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?