What is the molarity of 2.5 moles of NaOH in a 2.6L solution​

Nonmetal halogen family atmoic mass 35

|using the periodic tablewarm-upuse the periodic table in the tools bar to answer the following questions.what elemental classification does oxygen belongto? done

Aconcentrated solution of ammonia is 14.8m and has a density of 0.899g/l. what is the concentration of ammonia in this solution in weight percent (%w/w)?