Its a real to grow 25-35 grams on plant in 5,7 lit...

Yes. Depending on light, nutrients and how well you do as the grower it is very realistic to pull an ounce (28g) from 1.5 gal (5.7l)

it's possible with optimal growing condition: growing in SOG you can reach 400-500 gr/m² with 1m² tent, 16x6 l pots wich give 25 to 31,25gr per plant. From my experience growing with 8 x 6 l pots in 0,5m² with a 250W hps i reach 15-25 gr per plant depending strains and phenotypes. .

I think you are asking if you can. Your substrate will dictate that but if in coco perlite. I get about 2 ounces off clones in a 2.37 liter potter.