start with an ionic equation
Al(NO3)3 ->
which will show you how many moles of nitrate ions are formed from 1 mole of Al(NO3)3. Then use proportion to find the concentration from 0.70 M.
Consider a 0.70 M solution of Al(NO3)3 in water. What is the nitrate ion concentration in this solution, in units of moles/L?
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