Those figures are all per gallon, so:
In the case of BIAB, which is what I do, assuming you are full volume mashing
9 gal total water volume
Gypsum = .9 grams x9 = 8.1g
CaCl = .4 grams x9 = 3.6g
Epsom = .1 gram x9 = .9g
Canning Salt = .05 grams x9 = .45g
I don't use a sparge, but I believe it...