Element Z has two naturally occurring isotopes. The isotope with a mass of 10.012 amu ( 10_(Z) ) has a relative abundance of 19.91%. The isotope with a mass of 11.009 amu ( 11_ (Z) ) has a relative abundance of 80.09%. Calculate the average atomic mass of element Z. Be sure to type your work and round your answer to the correct number of significant figures.​

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation:

How many moles of no2 will form when 3.3 moles of cu are reacted with excess hno3?