A nurse is preparing to administer aripiprazole 160 mg IM to a client. Available is aripiprazole 400 mg/2 mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Rationale: Step by step calculation: Determine the dosage required: 160 mg Determine the concentration available: 400 mg/2 mL Simplify the concentration: 400 mg/2 mL=200 mg/mL Use the formula: Volume (mL)=Required dose (mg)/Concentration (mg/mL) Volume (mL)=160 mg/200 mg/mL Calculate the volume: Volume (mL)=0.8