Answer:
1mL should be administered to provide a 25-mg dose of aminophylline.
Explanation:
The problem states that one 20-mL ampul contains 0.5 g of aminophylline, and asks how many milliliters should be administered to provide a 25-mg dose of aminophylline.
The first step is converting 0.5g to mg.
Each g has 1000mg, so:
1g - 1000mg
0.5g - xmg
x = 1000*0.5
x = 500mg.
Now we have that one 20-mL ampul contains 500mg of aminophylline. How many milliliters should be administered to provide a 25-mg dose of aminophylline?
As the dose increases, so does the quantity of aminophylline. It means that we have a direct rule of a three, there is a cross multiplication. So:
20mL - 500mg
x mL - 25mg
500x = 500
x = 1 mL
1mL should be administered to provide a 25-mg dose of aminophylline.