Question

A is a solution prepared by disolving 1.575g of trioxonitrate(v) acid in 250cm of distiled water. Calculate the number of mole of A in 1dm of solution
how many moles in that mass?
multiply the by 4 (since you only have 1/4 of a liter)

by the way, volumes are in cm^3 or dm^3.

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