Chemistry Chegg Worksheet

1. A large family of boron-hydrogen compounds has the general formula BxHy. One member of this family contains 88.5% B; the remainder is hydrogen. What is its empirical formula?

2. Mandelic acid is an organic acid composed of carbon (63.15%), hydrogen (5.30%), and oxygen (31.55%). Its molar mass is 152.14 g/mol. Determine the empirical and molecular formulas of the acid.

3. Determine the simplest formulas of the following compounds.

a. the food enhancer monosodium glutamate (MSG), which has the composition 35.51% C, 4.77% H, 37.85% O, 8.29% N, and 13.60% Na

b. zircon, a diamond-like mineral, which has the composition 34.91% O, 15.32% Si, and 49.76% Zr

c. nicotine, which has the composition 74.0% C, 8.65% H, and 17.4% N

4. Calculate the molarity of each of the following solutions.

a. 1.45 mol HCl in 250. mL of solution

b. 14.3 mol NaOH in 3.4 L of solution

c. 0.341 mol KCl in 100.0 mL of solution

d. 250 mol NaNO3 in 350 L of solution

5. What is the molarity of each ion present in aqueous solutions prepared by dissolving 20.00 g of the following compounds in water to make 4.50 L of solution?

a. cobalt(III) chloride

b. nickel(III) sulfate

c. sodium permanganate

d. iron(II) bromide

6. How many moles of solute are present in each of these solutions?

a. 48.0 mL 0f 3.4 M H2SO4

b. 1.43 mL of 5.8 M KNO3

c. 3.21 L of 0.034 M NH3

d. 1.9×103 L of 1.4×10-5 M NaF

7. How many grams of solute are present in each of these solutions?

a. 37.2 mL of 0.471 M HBr

b. 113.0 L of 1.43 M Na2CO3

c. 21.2 mL of 6.8 M CH3COOH

d. 1.3×10-4 L of 1.03 M H2SO3

8. Determine the final molarity for the following dilutions.

a. 24.5 mL of 3.0 M solution diluted to 100.0 mL

b. 15.3 mL of 4.22 M solution diluted to 1.00 L

c. 1.45 mL of 0.034 M solution diluted to 10.0 mL

d. 2.35 L of 12.5 M solution diluted to 100.0 L

9. Determine the initial volume (in mL) needed to generate each of the following desired solutions by dilution.

a. 10.0 L of 0.45 M solution from 3.0 M solution

b. 1.50 L of 1.00 M solution from 11.7 M solution

c. 100.0 mL of 0.025 M solution from 1.15 M solution

d. 50.0 mL of 3.3×10-4 M solution from 0.25 M solution

10. Commercially available concentrated sulfuric acid is 18.0 M H2SO4. Calculate the volume of concentrated sulfuric acid required to prepare 2.50 L of 1.50 M H2SO4 solution.