I'm sure Arsenal in the Europa League will handle their opponents well.
Only if Arsenal won't get distracted by Premier League. I believe they prioritize Premier League more than Europa League. They must fight to get a position high enough (in top 4) to be in Champions League next season. They will prioritize it rather than try to bet all resources to win Europa League. There are two gates to be eligible for Champions League but get it from Premier League is a safer option.
but for the next 2 games in the Premier League, it's quite difficult for Arsenal. Tottenham and Liverpool are not easy opponents for Arsenal. although Liverpool is not in good form. but at any time I think Liverpool can solve their problems.
Tottenham may give Arsenal a test. the difference in points is only 1, even Tottenham is also unbeaten in 7 matches. it will be quite tough for Arsenal.
Two big matches for Arsenal and these matches will give us a better view on chance of Arsenal to get in top four and further, the Premier League trophy. Liverpool are in a crisis but they are strong in theory and can bring troubles to Arsenal.
Tottenham are not an easy team for Arsenal to beat. They are very dangerous with counter attacking and their players are not only too high but also too fast. I believe Arsenal will lose points in these matches.