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Questions and Answers
What is the first step in converting grams of a compound to molecules?
What is the first step in converting grams of a compound to molecules?
What is used to convert moles to molecules?
What is used to convert moles to molecules?
What is the molar mass of a substance?
What is the molar mass of a substance?
What is the molar mass of CO2?
What is the molar mass of CO2?
What conversion factor is used to convert from moles to molecules?
What conversion factor is used to convert from moles to molecules?
What is the first step in converting molecules of a compound to grams?
What is the first step in converting molecules of a compound to grams?
How is the molar mass used when converting moles to grams?
How is the molar mass used when converting moles to grams?
Which of the following is equal to one mole of a substance?
Which of the following is equal to one mole of a substance?
What do you need to calculate to convert grams of a substance to moles?
What do you need to calculate to convert grams of a substance to moles?
If you have 2 moles of CO2, how many grams do you have?
If you have 2 moles of CO2, how many grams do you have?
If you have 12.044 x 10^23 molecules of water, how many moles do you have?
If you have 12.044 x 10^23 molecules of water, how many moles do you have?
Which of the following represents Avogadro's number?
Which of the following represents Avogadro's number?
What is the chemical formula for dinitrogen trioxide?
What is the chemical formula for dinitrogen trioxide?
What is the chemical formula for iodine heptafluoride?
What is the chemical formula for iodine heptafluoride?
Which element has an atomic mass of approximately 16?
Which element has an atomic mass of approximately 16?
How many oxygen atoms are in one molecule of CO2?
How many oxygen atoms are in one molecule of CO2?
How many nitrogen atoms are in one molecule of N2O3?
How many nitrogen atoms are in one molecule of N2O3?
How many fluorine atoms are in one molecule of IF7?
How many fluorine atoms are in one molecule of IF7?
What is the chemical symbol for the element carbon?
What is the chemical symbol for the element carbon?
What is the chemical symbol for the element nitrogen?
What is the chemical symbol for the element nitrogen?
What is the chemical symbol for the element fluorine?
What is the chemical symbol for the element fluorine?
What is the chemical symbol for the element sulfur?
What is the chemical symbol for the element sulfur?
Which conversion involves using Avogadro's number?
Which conversion involves using Avogadro's number?
What is the value of Avogadro's number?
What is the value of Avogadro's number?
What is the purpose of calculating molar mass?
What is the purpose of calculating molar mass?
When converting molecules to grams, what is the second step after converting molecules to moles?
When converting molecules to grams, what is the second step after converting molecules to moles?
Which of the following is a necessary conversion factor when converting between grams and molecules?
Which of the following is a necessary conversion factor when converting between grams and molecules?
If you know the number of moles of a substance, what do you need to determine the mass in grams?
If you know the number of moles of a substance, what do you need to determine the mass in grams?
What unit is atomic mass measured in?
What unit is atomic mass measured in?
Where can you find the molar mass of an element?
Where can you find the molar mass of an element?
How do you calculate the molar mass of a compound?
How do you calculate the molar mass of a compound?
What is the molar mass of oxygen in carbon dioxide (CO2)?
What is the molar mass of oxygen in carbon dioxide (CO2)?
What are the units of molar mass when used as a conversion factor?
What are the units of molar mass when used as a conversion factor?
When converting from grams to moles, what should you do with the molar mass?
When converting from grams to moles, what should you do with the molar mass?
When converting from moles to grams, what do you do with the molar mass?
When converting from moles to grams, what do you do with the molar mass?
What is the first step when converting grams of a substance to moles?
What is the first step when converting grams of a substance to moles?
What conversion factor is used to convert grams to moles?
What conversion factor is used to convert grams to moles?
What value is required to convert moles of a substance to grams?
What value is required to convert moles of a substance to grams?
Which of the following is equal to the molar mass of a substance?
Which of the following is equal to the molar mass of a substance?
When converting grams to moles, what mathematical operation is required?
When converting grams to moles, what mathematical operation is required?
When calculating the molar mass of a compound, what do you need to know for each element?
When calculating the molar mass of a compound, what do you need to know for each element?
What is the purpose of using molar mass in calculations?
What is the purpose of using molar mass in calculations?
What must you do to convert from grams to moles?
What must you do to convert from grams to moles?
When converting moles to grams, what is the correct operation?
When converting moles to grams, what is the correct operation?
If you have a certain number of grams of a substance, what information do you need to find the number of moles?
If you have a certain number of grams of a substance, what information do you need to find the number of moles?
What is the relationship between atomic mass and molar mass?
What is the relationship between atomic mass and molar mass?
Which value must be calculated to convert a given mass of a compound to moles?
Which value must be calculated to convert a given mass of a compound to moles?
Which of these relationships is correct?
Which of these relationships is correct?
Which of the following is a conversion factor that relates mass and number of moles?
Which of the following is a conversion factor that relates mass and number of moles?
What is the atomic mass of an element?
What is the atomic mass of an element?
What does molar mass allow you to calculate?
What does molar mass allow you to calculate?
What is the first step when converting a quantity of grams to moles?
What is the first step when converting a quantity of grams to moles?
What number is used in the conversion between grams and moles?
What number is used in the conversion between grams and moles?
If you are given the number of moles of a substance, what must you determine to calculate the mass in grams?
If you are given the number of moles of a substance, what must you determine to calculate the mass in grams?
Which of these is necessary to convert between mass and amount of substance?
Which of these is necessary to convert between mass and amount of substance?
What value is equal to the molar mass of a compound?
What value is equal to the molar mass of a compound?
When converting between grams and moles, what serves as the conversion factor?
When converting between grams and moles, what serves as the conversion factor?
Which of these conversion factors is used to change grams to moles?
Which of these conversion factors is used to change grams to moles?
Which data point allows a chemist to change grams to moles?
Which data point allows a chemist to change grams to moles?
What tool facilitates the conversion between grams and moles of a substance?
What tool facilitates the conversion between grams and moles of a substance?
What is the value you must calculate to convert a weighed quantity to moles?
What is the value you must calculate to convert a weighed quantity to moles?
When converting from grams to moles, what must first be determined about the substance?
When converting from grams to moles, what must first be determined about the substance?
To convert a quantity from grams to moles, what piece of information is needed?
To convert a quantity from grams to moles, what piece of information is needed?
When beginning a calculation to convert a quantity in grams to a number of moles, what should a chemist first discover or calculate?
When beginning a calculation to convert a quantity in grams to a number of moles, what should a chemist first discover or calculate?
Flashcards
Grams to Molecules Conversion
Grams to Molecules Conversion
Molar Mass
Molar Mass
Avogadro's Number
Avogadro's Number
Molecules to Grams Conversion
Molecules to Grams Conversion
Molar Mass of CO2
Molar Mass of CO2
Molar Mass of SO3
Molar Mass of SO3
Molar Mass of N2O3
Molar Mass of N2O3
Molar Mass of IF7
Molar Mass of IF7
What is Molar Mass?
What is Molar Mass?
What is Atomic Mass?
What is Atomic Mass?
How to calculate molar mass of a compound?
How to calculate molar mass of a compound?
How to convert grams to moles?
How to convert grams to moles?
How to convert moles to grams?
How to convert moles to grams?
Molar Mass as Conversion Factor
Molar Mass as Conversion Factor
Study Notes
Converting Grams to Molecules
- Grams are converted to moles, then moles to molecules.
- Molar mass converts grams to moles.
- Avogadro's number (6.022 x 10^23) converts moles to molecules.
Example 1: CO2
- Problem: Determine the number of molecules in 55.1 grams of CO2.
- Molar mass of CO2: 1 carbon atom (12.01) + 2 oxygen atoms (2 x 16) = 44.01 grams/mole.
- Convert 55.1 grams of CO2 to moles, then to molecules using Avogadro's number: 1 mole of CO2 = 6.022 x 10^23 molecules of CO2.
- Calculation: (55.1 / 44.01) x (6.022 x 10^23) = 7.54 x 10^23 molecules of CO2.
Example 2: SO3
- Problem: Determine the number of molecules in 20.3 grams of SO3.
- Molar mass of SO3: 1 sulfur atom (32.07) + 3 oxygen atoms (3 x 16) = 80.07 grams/mole.
- Conversion factors: 1 mole of SO3 = 80.07 grams of SO3 and 1 mole of SO3 = 6.022 x 10^23 molecules of SO3.
- Calculation: (20.3 / 80.07) x (6.022 x 10^23) = 1.53 x 10^23 molecules of SO3.
Converting Molecules to Grams
- Molecules are converted to moles, then moles to grams.
- Molar mass of the compound is needed.
- Avogadro's number converts molecules to moles.
Example 3: N2O3
- Problem: Determine the number of grams in 4.5 x 10^24 molecules of dinitrogen trioxide (N2O3).
- Molar mass of N2O3: 2 nitrogen atoms (2 x 14.01) + 3 oxygen atoms (3 x 16) = 76.02 grams/mole.
- Avogadro's number converts molecules to moles: 1 mole of N2O3 = 6.022 x 10^23 molecules.
- Molar mass converts moles to mass: 1 mole of N2O3 = 76.02 grams.
- Calculation: (4.5 x 10^24 / 6.022 x 10^23) x 76.02 = 568.1 grams of N2O3.
Example 4: IF7
- Problem: Find the mass in grams of 7.3 x 10^23 molecules of iodine heptafluoride (IF7).
- Molar mass of IF7: 1 iodine atom (126.9) + 7 fluorine atoms (7 x 19) = 259.9 grams/mole.
- Convert molecules to moles: 1 mole of IF7 = 6.022 x 10^23 molecules of IF7.
- Convert moles to mass: 1 mole of IF7 = 259.9 grams.
- Calculation: (7.3 x 10^23 / 6.022 x 10^23) x 259.9 = 315.06 grams of IF7.
Atomic Mass vs. Molar Mass
- Atomic mass and molar mass both refer to the mass of an element but use different units.
- Atomic mass is measured in atomic mass units (amu).
- Molar mass is measured in grams per mole (g/mol).
Calculating Molar Mass of an Element
- To find the molar mass of an individual element, refer to the periodic table.
- Carbon (C) has a molar mass of 12.011 g/mol.
Calculating Molar Mass of a Compound
- To calculate the molar mass of a compound, add up the molar masses of each individual element in the compound.
- For carbon dioxide (CO2), the molar mass calculation is as follows:
- Carbon: 12.011 g/mol
- Oxygen: 2 * 16 g/mol = 32 g/mol
- Total: 12.011 + 32 = 44.011 g/mol
Molar Mass as a Conversion Factor
- Molar mass is a conversion factor with units of grams per mole.
- Molar mass is used to convert between grams and moles.
- Molar mass is used as a conversion factor when converting from grams to moles or vice versa.
Grams to Moles Conversion
- To convert grams to moles, divide the given mass (in grams) by the molar mass (in grams per mole).
- Example: Determine how many moles are in 5.3 grams of iron chloride (FeCl2).
- Given: 5.3 grams of FeCl2
- Find: Moles of FeCl2
- Plan: Use molar mass to convert grams to moles
- Molar mass of FeCl2:
- Iron (Fe): 55.85 g/mol
- Chlorine (Cl): 2 * 35.45 g/mol = 70.90 g/mol
- Total: 55.85 + 70.90 = 126.75 g/mol
- Calculation: (5.3 grams FeCl2) / (126.75 grams/mole) = 0.042 moles of FeCl2
Moles to Grams Conversion
- To convert moles to grams, multiply the given amount (in moles) by the molar mass (in grams per mole).
- Example: What is the mass of 0.30 moles of magnesium nitrate (Mg(NO3)2)?
- Given: 0.30 moles of Mg(NO3)2
- Find: Grams of Mg(NO3)2
- Plan: Use molar mass to convert moles to grams
- Molar mass of Mg(NO3)2:
- Magnesium (Mg): 24.31 g/mol
- Nitrogen (N): 2 * 14.01 g/mol = 28.02 g/mol
- Oxygen (O): 6 * 16.00 g/mol = 96.00 g/mol
- Total: 24.31 + 28.02 + 96.00 = 148.33 g/mol
- Calculation: (0.30 moles Mg(NO3)2) * (148.33 grams/mole) = 44.499 grams ≈ 44 grams of Mg(NO3)2 (2 significant figures)
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