Open 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. (9.4)b. What is the total volume, in milliliters, of the solution?
9. Solutions
Percent Concentrations
Struggling with GOB Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple 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.
0:52mWatch next
Master Percent Concentrations Concept 1 with a bite sized video explanation from Jules
Start learningRelated Videos
Related Practice
Percent Concentrations practice set
Problem sets built by lead tutorsExpert video explanations