H-h+cl+cl2h-cl... calculate the energy needed to break the bond​

Define dew point. i am writing this part to be able to ask the question

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

Answer asap need by wednesday morning calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 best answer will be brainliest