Textbook Question
A solution is prepared with 70.0 g of HNO3 and 130.0 g of H2O. The HNO3 solution has a density of 1.21 g/mL.
b. What is the total volume, in milliliters, of the solution?
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Multiple Choice
The pain reliever ibuprofen is sold as an oral suspension for children 2-11 years of age. How many milligrams would you obtain in a 2.7 tsp dose if it contains 100 mg per 5 mL? (1 tsp = 5 mL)
A
1.0×102 mg
B
67 mg
C
2.7×102 mg
D
54 mg
Verified step by step guidance1
First, understand the conversion factor given: 1 teaspoon (tsp) is equivalent to 5 milliliters (mL).
Next, convert the dose from teaspoons to milliliters. Since the dose is 2.7 tsp, multiply 2.7 by the conversion factor (5 mL/tsp) to find the volume in milliliters.
Now, use the concentration of ibuprofen provided: 100 mg per 5 mL. This means for every 5 mL of the suspension, there are 100 mg of ibuprofen.
Set up a proportion to find out how many milligrams of ibuprofen are in the volume you calculated in step 2. Use the ratio 100 mg/5 mL = x mg/volume in mL.
Solve the proportion for x to find the number of milligrams of ibuprofen in the 2.7 tsp dose.
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