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25mg/.75ml=1/30 mg/ml=33.3mg/ml=30*33.3mg/30ml=999mg/30ml=appx 1 gram in a 30ml bottle.
So, now the 1000 grams...that is a lot of stuff to put in a 30 ml bottle. That would be three times as dense as Hg. So I assume your 1000 is mg, if so, your answer is correct.