Final answer:
The final volume of the prescription mouthwash is calculated by adding the volumes of each component, resulting in 160 mL.
Step-by-step explanation:
The question asks about calculating the final volume of a mouthwash mixture when given the volumes of individual components. To find the final volume in mL, you would simply add up the volumes of viscous lidocaine 2% (30 mL), Maslow (an assumed typo, likely another liquid ingredient, 60 mL), Diphenhydramine elixir (to deliver 75 mg, based on a concentration of 12.5 mg/5 mL, we would need 30 mL), and carafate (40 mL, based on the provided concentration). Therefore, the final volume of the mouthwash would be 30 mL + 60 mL + 30 mL + 40 mL = 160 mL.