Roma, who have 67 points, moved nine clear of third-placed Napoli who visit Catania on Wednesday. Runaway leaders Juventus (78 points) host Parma, also on Wednesday.
Roma went ahead four minutes before half-time when Gervinho slipped the ball through the Torino backline and Mattia Destro stretched to prod home his ninth goal of the season.
Immobile, emerging as a late candidate for a place in Italy's World Cup squad, replied with a superb effort in the 52nd minute, meeting a long ball forward with a first-time volley into the far corner.
Immobile took his tally for the season to 17, making him the league's top scorer.
Torino looked set to take a point until they lost possession in midfield, Gervinho threaded another ball through the defence and Florenzi, who had only been on the field for eight minutes, placed his shot wide of Daniele Padelli.
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- Mattia Destro