What is the molar concentration?

What is the molar concentration of the ammonia with following info:?

• Ammonia has the formula NH3. Household ammonia is a dilute aqueous solution of NH3. Aqueous ammonia is a base that can neutralize acids. If 18.0 mL of 0.800 M HCl solution are needed to neutralize 5.00 mL of a household ammonia solution, what is the molar concentration of the ammonia?

• Answer:

  Write a balanced equation HCl + NH3 -------> NH4Cl(aq) 1 mole of HCl is required to neutralise 1 mole of NH3 So the nuber of moles of HCl in 18.0 ml of 0.800 M HCl = moles of NH3 in 5.00 ml ammonia solution Molarity = moles / L Therefore moles = Molarity x L moles HCl = 0.800 M x 0.0180 L moles HCl = 0.0144 moles Therefore there are 0.0144 moles of NH3 in the 5.00 ml of solution Molarity = moles / L = 0.0144 moles / 0.00500 L = 2.88 M NH3