Final answer:
The question is about calculating the mass of lorazepam present in 0.5 mL of solution, and the volume needed to obtain a 10 mg dose, both reliant on knowing the medication's concentration. Without the concentration value, we cannot provide an exact mass or volume calculation.
Step-by-step explanation:
The subject question pertains to the calculation of the mass of a solute in a specified volume of solution, a common task in the field of chemistry, and an example of a practical application of concentration calculations.
To find the mass of lorazepam in 0.5 mL of medication, one would normally use the concentration provided (in mg/mL) by either a formula or a direct statement. As no concentration is provided in the question, we cannot proceed with an exact answer. However, if a concentration were given, for instance, 'X mg/mL', the calculation would be as simple as multiplying the concentration by the volume of the solution, yielding the mass of lorazepam in milligrams.
For the second part regarding the doctor's order of 10 mg of lorazepam, once the concentration is known, the volume required to obtain 10 mg of lorazepam could be calculated by dividing the desired mass (10 mg) by the concentration (mg/mL). This would give us the volume in milliliters needed to provide the prescribed dose.