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Questions and Answers
What are the steps to convert moles to grams?
What are the steps to convert moles to grams?
How do you convert grams to moles?
How do you convert grams to moles?
Divide the number of grams by the molar mass.
1 mole = ______ atoms, molecules, protons, etc.
1 mole = ______ atoms, molecules, protons, etc.
6.02 x 10^{23}
When converting from moles to molecules, you divide by 6.02 x 10^{23}.
When converting from moles to molecules, you divide by 6.02 x 10^{23}.
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What is the first step in converting grams to molecules?
What is the first step in converting grams to molecules?
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What is Avogadro's number?
What is Avogadro's number?
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How do you calculate the molar mass of a compound?
How do you calculate the molar mass of a compound?
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The molar mass is expressed in ______.
The molar mass is expressed in ______.
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What is the process to find the percent composition?
What is the process to find the percent composition?
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What is an empirical formula?
What is an empirical formula?
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An atomic mass is unitless.
An atomic mass is unitless.
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Study Notes
Converting Moles to Grams
- Convert moles of a substance to grams by determining the number of moles, calculating the molar mass, and multiplying the two values.
Converting Grams to Moles
- To find moles from grams, divide the mass of the substance by its molar mass.
- Example: For 2 g of water (H2O), with a molar mass of 18 g/mol, divide 2 g by 18 g/mol to get the amount in moles.
Converting Moles to Molecules
- Utilize Avogadro's number (6.02 x 10²³) for conversions: 1 mole equals 6.02 x 10²³ particles (atoms or molecules).
- To convert moles to atoms or molecules, multiply the number of moles by Avogadro's number; for reverse, divide by Avogadro's number.
Converting Molecules to Moles
- One mole corresponds to 6.02 x 10²³ particles.
- Convert moles to molecules by multiplying by Avogadro's number, and convert molecules to moles by dividing by it.
Converting Grams to Molecules
- First, find moles by dividing the number of molecules by Avogadro's number (6.022 x 10²³).
- Then, calculate grams by multiplying the number of moles by the compound's molar mass.
Converting Molecules to Grams
- Start by converting the number of molecules to moles using Avogadro's number.
- Multiply the resulting moles by the molar mass to find the mass in grams.
Calculating Molar Mass of an Element
- Find the average atomic mass (atomic weight) of each element from the periodic table.
- Multiply each atomic mass by the number of atoms in the formula and sum the results for total molar mass.
Calculating Molar Mass of a Compound
- For compounds, add the atomic masses of all constituent atoms.
- Example: The molar mass of NaCl is calculated by summing the atomic mass of sodium (22.99 g/mol) and chlorine (35.45 g/mol).
Calculating Percent Composition
- To find percent composition by mass, calculate the mass of the element and the molar mass of the entire compound.
- Use the formula: (mass of element / molar mass of compound) x 100%.
Calculating an Empirical Formula
- Assume an unknown compound has a mass of 100 g.
- Convert the mass of each element to moles, identify the smallest mole value, and divide all mole values by this number.
- If ratios are not whole numbers, multiply to achieve whole-number ratios, then write the empirical formula.
Setting Up and Solving Bridge Format with Significant Figures
- Not specified in the provided content.
Differences Between Mass & Molar Mass
- Molar mass indicates the mass of one mole of a substance, measured in grams per mole (g/mol).
- Atomic mass is dimensionless and defined as 1/12 the mass of a carbon-12 atom.
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Description
This quiz focuses on essential conversions in chemistry, specifically converting moles to grams and grams to moles. It provides step-by-step methods to help you understand and perform these calculations effectively.
