Final answer:
The nurse will give 1.25 ml of the reconstituted solution.
Step-by-step explanation:
To determine how many ml the nurse will give, we need to use the concentration of the reconstituted solution. The concentration is given as 400 mg/2ml, which means there are 400 mg of streptomycin in every 2 ml of the solution. The nurse needs to administer 0.25 g of streptomycin, which is equivalent to 250 mg. We can use a proportion to find the volume of the solution needed:
(400 mg) / (2 ml) = (250 mg) / (x ml)
Cross multiplying,
400x = 500
x = 500 / 400
x = 1.25 ml
Therefore, the nurse will give 1.25 ml of the reconstituted solution.