It's a little hard to know but I assume you're talking about HNO3 which is nitric acid. What's the density of the acid? What's the molarity of the acid?
If you assume HNO3 solution is 100% HNO3 (and it isn't--at most it can be about 70%-- then 6.0 g HNO3 will be mols = g/molar mass = 6.0/63 = ? and that many moles will be present no matter how many cc you have. I suspect this isn't the real problem but has been posted through a misunderstanding.
Calculate the moles of trioxonitrate (v) acid containing 6.og of acid in 250CM3
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