I agree with you that Barcelona will win against Napoli in the second leg of the UEFA Champions League Round of 16 matches. Napoli's performance against Barcelona was poor. Napoli just managed to have one shot on target against Barcelona, which led to a goal that earned them a draw. With Napoli's present form, it will be hard for them to beat Barcelona at Camp Nou.
Barcelona and Napoli have met at least 9 times, including the first Champions League match yesterday and of these many meetings, Napoli has only beaten Barcelona once, while Barcelona won 5 times and the rest ended in a draw, so it is very possible that in the second match, Barcelona will actually win the match because apart from Napoli not being very good in European competition except last season, they are also not in good condition this season, also the change of coach may not be able to bring this team from Serie A to perform better, while Barcelona is a team that is not really taken into account in the champions league but against Napoli, they have better strength than their opponents, and winning by just 1 goal is enough to take Barcelona to the Champions League quarter-finals, but if the match had to be decided by a penalty shootout the result could be the opposite.