I don't think Napoli can get a win against Barcelona but I hope they can, the less Spanish in the Champions League the better it will be for Italy for the fifa ranking
It won't be easy match to play in Barcelona home but I think Napoli still has a chance to beat Barcelona. The draw got from the match against Torino can't determine the result of the match against Barcelona. Sometimes, it is totally different when a team plays in an international competition. Even if Napoli looks not very convincing in domestic league, I'm sure they may play better in UCL. So, I really expect them to give a surprise in UCL.
1-1 was the final score they got in the first leg, with a draw like that, Napoli still has a chance to get rid of Barcelona, even though it's not something easy for them to do, because at the same time Barcelona is also definitely doing their best. to enable them to qualify for the next round.
But we'll see later, whether they will play well or vice versa. Likewise with Barcelona, whether they will play well or not. Because that will really determine the final result they will get at the end of the match, both for Napoli and for Barcelona.