A vial contains 1 g of capreomycin in a 10-mL vial for reconstitution prior to injection. According to the package insert, when 2.15 mL of diluent is added, 2.85 mL of injection is prepared and when 3.3 mL of diluent is added, 4 mL of injection is prepared. How many milliliters of diluent should be added to prepare an injection containing capreomycin, 300 mg/mL?

2.63 ml of diluent should be added to prepare an injection containing capreomycin, 300 mg/mL

Explanation:

300 mg/ml is 0.3 g/ml

1g of capreomycin  was contained

volume of solution = mass of capreomycin / ( concentration of capreomycin solution)

= ( 1g) / ( 0.3g/ml) = 3.33 ml

Now when 2.15 ml diluent added we got solution volume as 2.85 ml

Therefore, volume by capreomycin = 2.85 - 2.15 = 0.7 ml

1g capreomycin occupies 0.7 ml

volume of dilent needed = injection volume - volume occupied by capreomycin

volume of dilent needed = 3.33ml - 0.7ml

volume of dilent needed = 2.63 ml

yes

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08: 21

read the excerpt from "the tell-tale heart.”

object there was none. passion there was none. i loved the old man. he had never wronged me. he had never given me insult. for his gold i had no desire. i think it was his eye! yes, it was this! he had the eye of a vulture—a pale blue eye, with a film over it. whenever it fell upon me, my blood ran cold; and so by degrees—very gradually—i made up my mind to take the life of the old man, and thus rid myself of the eye forever.  

read the excerpt from "the black cat.”

beneath the pressure of torments such as these, the feeble remnant of the good within me succumbed. evil thoughts became my sole intimates—the darkest and most evil of thoughts. the moodiness of my usual temper increased to hatred of all things and of all mankind; while, from the sudden, frequent, and ungovernable outbursts of a fury to which i now blindly abandoned myself, my uncomplaining wife, alas! was the most usual and the most patient of sufferers.

by revealing the narrator’s deepest thoughts, the author