What is associated with: a is for this las vegas hotel where elvis priscilla were married on may 1 1967 not by a genie but by a judge?

Based on the clue 'a hydrate contains this compound weakly bound in i...', what is the answer? What is associated with: a hydroelectric power plant at this us landmark opened in 1881? Based on the clue 'a hymn of praise or loyalty perhaps a national one', what is the answer? Based on the clue 'a is for a capella from the italian for in this pl...', what is the answer? Based on the clue 'a is for this romeo juliet tradesman a druggist f...', what is the answer? Based on the clue 'a is words picture a poem without', what is the answer? Based on the clue 'a jack bauer is a doc who is still up working aft...', what is the answer? Based on the clue 'a jack in a deck of cards or part of a church', what is the answer?