Final answer:
The flow rate needed to administer the required dose is 0.2 mL/hr.
Step-by-step explanation:
To calculate the flow rate needed to administer the required dose, we can use the concentration and volume of the available solution.
The available solution is 25 g of 50% magnesium sulfate in 300 mL. Since the required dose is 2 g/hr, we can set up a proportion:
(25 g / 300 mL) = (2 g / x mL)
Cross-multiplying and solving for x, we find that the flow rate in mL/hr would be 0.2 mL.