How many grams are in 1 ounce? Hi Kathy, It depends! 1 ounce, avoirdupois = 28.350 grams (approx.) -- this is the ounce used commonly in the US. (There are 16 ounces in an avoirdupois pound.) 1 ounce, troy = 31.103 grams (approx.) -- this is used for precious stones and metals in the US; perhaps it is still used by druggists. 1 oz = 30 g x / 4 oz = 30 g/1 oz x = 120 g 2% means 2 g/100 g x / 120 g = 2 g/100 g x = 2.4 g = quantity: What volume of a 2% erythromycin solution can be made from 15 gm of erythromycin powder? -----2% erythromycin solution means 2 g/100 mL x / 15g = 100 mL/2 g x = 750 mL = volume: How many 25 mg tablets would be needed to make 50 mL of a 10% solution?

Jan 31, 2018 · That makes it easy to solve, how many grams in an ounce? If an ounce is eight eighths, that’s 3.5 grams x 8, or 28 grams in an ounce, for all intents and purposes.

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