Barcelona vs Bayern Munich, the winning opportunity may be 50:50. But considering the current performance of Barcelona, I am pessimistic that Barcelona can win this match, especially if Bayern Munich play with all their key players. The very possible result is a draw, I guess the final score maybe 2-2.
Not trying to portray Barcelona as a team to beat, but Bayern Munich this are utterly shit themselves, and their performance even in the Bundesliga is more than enough to buttress my point, so getting a win against Bayern for Barcelona shouldn't much of an uphill battle, because even despite losing the first leg, Barcelona were pretty much the better side, and Barcelona chances of qualifying doesn't solely depends on getting a win in their next two fixtures, but rather hoping Inter slips in both of their and that's also highly improbable.
Barcelona's chances are slim, they not only have to wipe out the remaining matches with a win, but also their rivals have to be unable to pick up points in their match. They also have to face an opponent who always makes it difficult for them every time they meet, Bayern Munich. I am pessimistic that Barcelona will be able to get away from this difficult period, and they must be willing to lose the Champions League this season.