How many tbsp in a 120 gram?

The only way to answer this is to know what substance you are measuring. Tablespoon is a measurement of volume (15 ml) and gram is a measurement of weight. 120 grams of water would fill a volume of 120 ml or 8 tablespoons whereas 120 grams of salt (which is about 2.1 times denser than water) would only fill about 3.8 tablespoons.