What percentage of the element consists of this isotope?

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work

Element before carbon on the periodic table

2-bromo-2-methylbutane undergoes an e1 elimination reaction in the presence of ethanol. in the next reaction only one of the possible products is represented. although the product shown is not the major product of the reaction, notice that there is more than one way it can be produced. complete the mechanism and draw the missing substances.