Calculate the atomic mass of an element X if it has 3 naturally occurring isotopes: X-20 with an abundance of 90.51% and a mass of 19.992, X-21 with an abundance of 0.27% and a mass of 20.994, and X-22 with an abundance of 9.22% and a mass of 21.991. Using the calculated mass, which element is this likely to be? this is the last question so plz help me

Achemist is studying the following equilibirum, which has the given equilibrium constant at a certain temperature: 2 no(g) + cl2(g) < => 2 nocl(g) kp = 2 x 10^(-6)he fills a reaction vessel at this temperature with 13. atm of nitrogen monoxide gas and 12. atm of chlorine gas. use this data to answer the questions: a. can you predict the equilibrium pressure of noci, using only the tools available to you within aleks? y/nb. if you said yes, then enter the equilibrium pressure of nocl at right. round your answer to 1 significant digit.