Posted by diana on Monday, December 5, 2011 at 3:02pm.
The sample has a mass of 116.9g. If it is 70% HNO3 (by mass but the post doesn't say that), then the mass of HNO3 is that 116.9 g is 116.9*0.70 = ? grams HNO3.
Then moles HNO3 = grams HNO3/molar mass HNO3.
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