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Questions and Answers
What is the mass of 1 mole of HCl?
What is the mass of 1 mole of HCl?
How many representative particles are in one mole?
How many representative particles are in one mole?
What is the first step in calculating the number of moles in 2.85 g of CaC2?
What is the first step in calculating the number of moles in 2.85 g of CaC2?
What does the term molar mass refer to?
What does the term molar mass refer to?
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If 1 mole of Boron has a mass of 10.8 g, how many grams would 3 moles of Boron weigh?
If 1 mole of Boron has a mass of 10.8 g, how many grams would 3 moles of Boron weigh?
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How can you determine the number of atoms in 2.50 mol of Al?
How can you determine the number of atoms in 2.50 mol of Al?
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What is the molar mass of KOH?
What is the molar mass of KOH?
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If 1 mole of a substance equals its molar mass in grams, how many grams are in 0.5 moles of a substance with a molar mass of 64.10 g?
If 1 mole of a substance equals its molar mass in grams, how many grams are in 0.5 moles of a substance with a molar mass of 64.10 g?
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Flashcards
Moles of Al atoms in 2.50 moles
Moles of Al atoms in 2.50 moles
To find the number of atoms in 2.50 moles of aluminum (Al), multiply 2.50 moles by Avogadro's number (6.02 x 10^23 atoms/mole).
Moles of ZnCl2
Moles of ZnCl2
To find the number of moles in a given number of formula units of a compound, divide the number of formula units by Avogadro's number (6.02 x 10^23 formula units/mol).
Molar Mass
Molar Mass
The mass in grams of one mole of a substance. It's the sum of the atomic masses of all atoms in a substance or formula unit.
Molar Mass of KOH
Molar Mass of KOH
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Moles from mass of CaC2
Moles from mass of CaC2
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Mass of Ca from moles
Mass of Ca from moles
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Moles Definition
Moles Definition
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Molar Mass Units
Molar Mass Units
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Study Notes
Dimensional Analysis, Moles, and Mass
- Dimensional analysis is used to convert between different units in calculations.
- Showing how units cancel is crucial in dimensional analysis.
- Moles are a unit that relates the number of particles (atoms or molecules) to mass.
- Avogadro's number (6.02 x 1023) links the number of moles to the number of particles.
- The molar mass of a substance is the mass in grams of one mole of that substance. It equals the substance's atomic mass in grams.
Mole Practice Problems
- Example problems include calculating the number of atoms in a given number of moles of aluminum (Al).
- Another example is calculating the number of moles containing a certain number of formula units of zinc chloride (ZnCl₂).
Lab Tie-In
- A mole of an element has a mass equal to its atomic mass in grams.
- A mole of a compound has a mass equal to the sum of the atomic masses of its constituent elements.
- The molar mass of a substance is crucial for converting between mass and moles or particles in a calculation.
Why Does This Work?
- Atomic mass units (amu) are based on the number of protons and neutrons in an atom.
- The periodic table's average atomic mass is based on the abundance of different isotopes of an element.
- Atomic mass is not always a whole number due to the presence of different isotopes for each element.
Moles are Based on Carbon-12
- Moles are based on the number of atoms present in 12 grams of carbon-12.
- Calculating the number of atoms in 12 grams of carbon-12 led to Avogadro's number.
So What's the Point?
- Convert between mass, moles, and particles.
- Conversion factors using moles and molar mass help solve problems involving these quantities.
Let's Practice (Example Problems)
- Example 1: Calculating the molar mass of potassium hydroxide (KOH). The calculation involved adding the atomic masses of K, O, and H to determine the molar mass.
- Example 2: Determining the number of moles in 2.85 grams of calcium carbide (CaC₂). Using dimensional analysis, this problem gives the answer of 0.0445 moles.
- Example 3: Determining the mass of 1.32 moles of calcium (Ca). Using the conversion factor of molar mass (40.08g/mol), the answer is 52.9 grams.
- Example 4: Calculating the number of atoms in 4.6 grams of silver (Ag). This involved a two-step calculation to determine the number of atoms.
Mole Practice
- Example: Calculating the mass of 1.60 x 1024 atoms of manganese (Mn). The calculated answer is 146 grams. Note all conversion problems are solved using dimensional analysis.
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Description
This quiz covers the concepts of dimensional analysis, moles, and mass in chemistry. You'll explore the relationships between particles, moles, and molar mass, along with practical problems related to these concepts. Test your understanding with sample calculations and applications in a lab context.
