Total valence electrons of F2

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

If you add 5.00 ml of 0.100 m sodium hydroxide to 50.0 ml of acetate buffer that is 0.100 m in both acetic acid and sodium acetate, what is the ph of the resulting solution? acetic acid: ka = 1.8. x 10-5

Is 9 correct? and can someone me with 10? it’s due tomorrow, you