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uiz: dosage calculation (21 questions, weight 15%)
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the order is for 9 mg. in stock is 20 mg/2ml. how many millilitres do you give?
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question 2
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the patient is to receive 2 grams of an antibiotic. tablets available are 500 milligrams. how many tablets should the pat
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the doctor orders 3 grams of a drug. the stock reads 250 mg per 5 ml. how many ml do you give?
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Explanation:

Question 1

Step1: Find the concentration per mL

The stock is $20\space mg/2\space mL$, so the concentration is $\frac{20\space mg}{2\space mL}=10\space mg/mL$.

Step2: Calculate the volume for 9 mg

We use the formula $Volume = \frac{Dose}{Concentration}$. So, $Volume=\frac{9\space mg}{10\space mg/mL}=0.9\space mL$.

Step1: Convert grams to milligrams

Since $1\space gram = 1000\space milligrams$, then $2\space grams = 2\times1000 = 2000\space milligrams$.

Step2: Calculate the number of tablets

We use the formula $Number\space of\space tablets=\frac{Total\space dose}{Dose\space per\space tablet}$. So, $Number\space of\space tablets=\frac{2000\space mg}{500\space mg}=4$.

Step1: Convert grams to milligrams

Since $1\space gram = 1000\space milligrams$, then $3\space grams = 3\times1000 = 3000\space milligrams$.

Step2: Find the concentration per mL

The stock is $250\space mg/5\space mL$, so the concentration is $\frac{250\space mg}{5\space mL}=50\space mg/mL$.

Step3: Calculate the volume

We use the formula $Volume = \frac{Dose}{Concentration}$. So, $Volume=\frac{3000\space mg}{50\space mg/mL}=60\space mL$.

Answer:

$0.9$

Question 2