Please help me, please

Why are the trends and exceptions to the trends in ionization energy observed?

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?