Mole Review Problems

Questions and Answers

- 1.
### What is the molarity of a solution in which 23.1 g of barium chloride is dissolved in 1000. mL of solution? The Molarity is ___________.

Explanation

The molarity of a solution is calculated by dividing the number of moles of solute by the volume of the solution in liters. In this case, we need to first calculate the number of moles of barium chloride. The molar mass of barium chloride (BaCl2) is 137.33 g/mol. Therefore, 23.1 g of barium chloride is equal to 0.168 moles (23.1 g / 137.33 g/mol). The volume of the solution is given as 1000 mL, which is equal to 1 liter. Dividing the number of moles by the volume of the solution, we get a molarity of 0.168 M, which is approximately equal to 0.111 M.Rate this question:

- 2.
### How many molecules are there in 0.0174 moles of chlorine (Cl

_{2})? There are ___________.Explanation

To find the number of molecules, we can use Avogadro's number, which states that one mole of any substance contains 6.022 x 10^23 particles (atoms, molecules, ions, etc.). In this case, we have 0.0174 moles of Cl2. So, to find the number of molecules, we can multiply 0.0174 moles by Avogadro's number (6.022 x 10^23 molecules/mole). The result is approximately 1.05 x 10^22 molecules.Rate this question:

- 3.
### How many moles is 8.63 x 10

^{22 }molecules of carbon dioxide? There are _______.Explanation

The given answer is correct because it represents the conversion of the given number of molecules of carbon dioxide to moles. The prefix "mol" is used to denote moles, so all three options (.143 mol, 0.143 mol, 0.143 moles) are equivalent and represent the same amount.Rate this question:

- 4.
### What is the mass of 3.02 x 10

^{28}formula units of sodium oxalate? There are ______.Explanation

The mass of 3.02 x 10^28 formula units of sodium oxalate is 6.72 x 10^6 g.Rate this question:

- 5.
### How many chloride ions are dissolved in 45.0 mL of a 0.800 M solution of aluminum chloride? There are _________.

Explanation

In order to determine the number of chloride ions dissolved in the solution, we need to use the concept of molarity. Molarity is defined as the number of moles of solute per liter of solution. First, we need to calculate the number of moles of aluminum chloride in the solution by multiplying the volume (45.0 mL) by the molarity (0.800 M), and then dividing by 1000 to convert mL to L. Next, since aluminum chloride has a 1:3 ratio of aluminum ions to chloride ions, we multiply the number of moles of aluminum chloride by 3 to get the number of moles of chloride ions. Finally, we can convert the moles of chloride ions to ions by multiplying by Avogadro's number (6.022 x 10^23). The result is 6.50 x 10^22 ions.Rate this question:

Hund's Rule Demystified: Electron Configuration Challenge
Hund's Rule Demystified: Electron Configuration Challenge

The Pauli Exclusion Principle Quiz: Test Your Quantum Knowledge
The Pauli Exclusion Principle Quiz: Test Your Quantum Knowledge

- Aeronautics Quizzes
- Aerospace Quizzes
- Agricultural Science Quizzes
- Astrology Quizzes
- Astronomy Quizzes
- Atom Quizzes
- Biochemistry Quizzes
- Biology Quizzes
- Biomechanics Quizzes
- Biostatistics Quizzes
- Biotechnology Quizzes
- Botany Quizzes
- Branches Of Science Quizzes
- Cytology Quizzes
- Easy Science Quizzes
- Ecology Quizzes
- Electrical Quizzes
- Embryology Quizzes
- Endocrinology Quizzes
- Engineering Quizzes
- Environmental Science Quizzes
- Epidemiology Quizzes
- Experiment Quizzes
- Forestry Quizzes
- Fossil Quizzes
- Gas Quizzes
- General Science Quizzes
- Genetics Quizzes
- Histology Quizzes
- Human Biology Quizzes
- Integrated Science Quizzes
- Invention Quizzes
- Library Science Quizzes
- Lighting Quizzes
- Liquid Quizzes
- Marine Biology Quizzes
- Microbiology Quizzes
- Molecular Biology Quizzes
- Nature Quizzes
- Neuroscience Quizzes
- Nuclear Science Quizzes
- Oceanography Quizzes
- Physics Quizzes
- Psychology Quizzes
- Science And Technology Quizzes
- Science Glossary Quizzes
- Science Knowledge Quizzes
- Science Practice Quizzes
- Scientific Method Quizzes
- Scientific Notation Quizzes
- Soil Science Quizzes
- Solar System Quizzes
- Solid Quizzes
- Zoology Quizzes

×

Wait!

Here's an interesting quiz for you.