Alexis Sanchez opened the scoring in the 11th minute, racing clear after seizing on a Gary Cahill mistake.
Theo Walcott added a second just two and a half minutes later, converting from close range from Hector Bellerin’s ball across the box.
The two goals for Wenger’s side had come after six games without scoring against Chelsea in the Premier League.
The impressive Mesut Ozil added a third, five minutes from half-time, when he volleyed home from Sanchez’s ball across the box. (s:mirroruk sport)