Help me on these 2 science questions for brainliest please...

What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

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.

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !