Espanyol is a very weak team this season and if Espanyol were to play Barcelona in the near future, I think everyone would know which team would win the match. Because that match is a very easy match for Barcelona and will be used as an opportunity for Barcelona to get full points. This season Barcelona will win the La Liga title because Barcelona still looks very focused on this season, especially in the remaining matches that are still there.
Barcelona will ensure the title this season when they face Espanyol. If they win the match then Barcelona has locked the title in the match. Indeed, Espanyol performance in their season was quite bad, they even found it difficult to provide good resistance against their opponents. Therefore I'm pretty sure Barcelona will win the game maybe even by a big score.
Espanyol are in 19th place in the standings, they are fighting to get out of the relegation zone but this week's opponent is Barcelona and it is difficult for them to beat barcelona.