What volume, in mL, of 4.1 mol/L sulfuric acid is required to completely react with 30.5 mL of a 4.25 mol/L ammonia solution?

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What volume, in mL, of 4.1 mol/L sulfuric acid is required to completely react with 30.5 mL of a 4.25 mol/L ammonia solution? H2SO4 +2NH3 –> (NH4)2 SO4

Calculate the concentration of a phosphoric acid solution if 42.0 mL of H3PO4(aq) requires 0.513 mol of NaOH(aq), for complete neutralization. H3PO4 +3NaOH –> Na3PO4 + 3H2O/ How many moles of aluminium are required to react with 459 mL of 2.1 mol/L hydrochloric acid?