what yarn oz do i use when not specified

the pattern im going to do says to use 100% superwash merino 100g,210yards, but doesnt say what oz of yarn to use…what to do!!!

You can convert the grams to ounces. 100 grams = about 3.5 oz.
Google will do these conversions or you can figure one gram is 0.035 oz.

thank you so much!!

Does it say what weight of yarn? Like DK or worsted? What pattern are you doing?