Someone pls help me I will make you brain

What is the number of moles in 15.0 g ash3?

What is the formula that this ionic compounds could form sr2+p3-o2-

Which of the following statements about acidic water is true? a. acid has no effect on the h,o molecules. b. the solution contains a larger number of oh ions than h,o ions. c. the solution contains a larger number of h,o ions than qh ions. d. the solution contains an equal number of h,o ions and oh ions. none of the above e.