Question

question 3 (2.5 points)
what solution is created if 180 ml of hydrogen peroxide is mixed with 60 ml of
normal saline?
○ 240 ml ¼ strength
○ 240 ml 1/3 strength
○ 240 ml ½ strength
○ 240 ml ¾ strength
question 4 (2.5 points)
a vial of penicillin g procaine contains 600,00 0 units/ml. what is the concentration
of the medication if the patient is to receive 4 ml of the medication?
○ 1,200,000 units
○ 1,600,000 units
○ 2,400,000 units
○ 2,800,000 units
question 5 (2.5 points)
a multidose vial of solu - medrol 500 mg is reconstituted with 8 ml of bacteriostatic
water to yield 125 mg/2ml. how many ml of the medication should be given if a
patient is to receive 75 mg?
○ 1 ml

Explanation:

Question 3

Step1: Find total volume

Total volume = 180 mL + 60 mL = 240 mL.

Step2: Calculate strength fraction

Strength fraction = $\frac{\text{Volume of hydrogen peroxide}}{\text{Total volume}}$ = $\frac{180}{240}$ = $\frac{3}{4}$.

Step1: Use concentration formula

Total units = Concentration (units/mL) × Volume (mL).

Step2: Substitute values

Concentration = 600,000 units/mL, Volume = 4 mL. So total units = 600,000 × 4 = 2,400,000 units.

Step1: Find mg per mL

From 125 mg/2 mL, mg per mL = $\frac{125}{2}$ = 62.5 mg/mL.

Step2: Calculate volume for 75 mg

Volume = $\frac{\text{Desired mg}}{\text{mg per mL}}$ = $\frac{75}{62.5}$ = 1.2 mL? Wait, wait, let's check again. Wait, the reconstitution is 125 mg/2 mL. So set up proportion: $\frac{125\ \text{mg}}{2\ \text{mL}} = \frac{75\ \text{mg}}{x\ \text{mL}}$. Cross - multiply: 125x = 75×2 → 125x = 150 → x = $\frac{150}{125}$ = 1.2 mL? But maybe I misread. Wait, the problem says "yield 125 mg/2 mL". So for 75 mg, let's do it again. Let x be the volume. $\frac{125\ \text{mg}}{2\ \text{mL}}=\frac{75\ \text{mg}}{x\ \text{mL}}$. So x = $\frac{75\times2}{125}$ = 1.2 mL. Wait, but maybe the options have 1.2 mL? Wait, the original problem's options (the visible one is 1 mL, maybe a typo, but following calculation:

Wait, 125 mg in 2 mL, so per mL is 62.5 mg. 75 mg / 62.5 mg per mL = 1.2 mL. But maybe the correct way: Let's check the proportion again. 125 mg is in 2 mL, so for 75 mg, x mL. So 125/2 = 75/x → 125x = 150 → x = 1.2 mL. But if the options have 1.2 mL (maybe the user's image cut off, but based on calculation, it's 1.2 mL. But let's do it step by step.

Step1: Set up proportion

$\frac{125\ \text{mg}}{2\ \text{mL}}=\frac{75\ \text{mg}}{x\ \text{mL}}$

Step2: Solve for x

Cross - multiply: 125x = 75×2
125x = 150
x = $\frac{150}{125}$ = 1.2 mL

Answer:

240 mL ¾ strength

Question 4