Can someone please help

Calculate the mass percent of hydrogen in methyl acetate

Which of the dna typing techniques do you think you would choose if you had to analyze a dna sample? why?

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present