How many protein is in 100gm of protein?

If the given 100 gm sample is of a pure protein, it will contain 100 gm protein. If your intention was to ask for the amount of protein in some food source, then it will depend on the different samples, such as 100 gm Soy bean will have approx 40 gm protein, Almonds will have 22-24 gm protein and like wise.