Key Terms
what is Avogadro’s number?
6.022 x 1023 atoms
From the equation N2 + 3H2 → 2HN3, how many moles of N2 are there?
1 mole
Is this true? You must convert grams to moles to do stoichiometry.
True
What is the molar mass of CO2?
44.01 g/mol
1.Is this true about stoichiometry? Stoichiometry is used to determine the quality of products and reactants that are needed or produced in a reaction?
False
What does percent composition solve for?
The percentage of each element in a compound, based on their masses.
From the equation N2 + 3H2 → 2HN3, how many moles of hydrogen are needed to react with 1 mole of nitrogen?
3 moles
What type of conversion is this?
How many moles of KClO3 must decompose to make 9 moles of gaseous oxygen?
Type 1: mol to mol
What is the molar mass of Calcium chloride(CaCl2)?
110.98 g/mol
Which of these measurements are used in stoichiometry?
-Moles
-Mass
-Volume
-All of the above
All of the above
Which one correctly defines stoichiometry?
A). A section of chemistry related to stocks
B). A section of chemistry that involves reactants and/or products in a chemical reaction to determine its quantitative data.
C). A section of chemistry that studies the chemistry of molecular subunits
B). A section of chemistry that involves reactants and/or products in a chemical reaction to determine its quantitative data.
CO2 + 2LiOH → Li2CO3 + H2O
What is the mole ratio between CO2 and H2O ?
1 mole to 1 mole
What type of conversion is this?
How many grams of lithium nitrate will be needed to react with lead(IV) sulfate to produce 250 grams of lithium sulfate?
Type 4: grams to grams
What is the molar mass of Mg(OH)2?
58.3 g/mol
Is this true? Mole ratios are found from the balanced equation of a reaction.
True
Which one correctly defines mole ratio?
A). The ratio between the amount of moles that two compounds have in a reaction
B). The ratio between the distance of moles of an element from its surroundings
C). The ratio between the mass of moles that two compounds have in a reaction
A). The ratio between the amount of moles that two compounds have in a reaction
CH₄ + 2O₂ → CO₂ + 2H₂O
What is the mole ration between CH4 and H2O?
1 mole to 2 moles
What type of conversion is this?
How many moles of solid aluminum are required to produce 4.5 grams of aluminum oxide?
Type 2: mol to grams
What is the formula mass of CO2?
44.01 amu
When in doubt, always change to ___
moles
What does Ms. Dwyer say about Molecular formula.... think M and M
She says we are solving for the _____ ______
the multiplying factor
Convert 2.2 moles of CH₄ to moles of CO₂
CH₄ + 2O₂ → CO₂ + 2H₂O
2.2 moles of CO₂
What type of conversion is this?
What mass of carbon dioxide is produced if you start with 2.25 mol of lithium carbonate?
Type 3: grams to moles
What's the molar mass and formula mass of 2LiOH?
47.90 (rounded)
47.90 g/mol
47.90 amu
Which of these products is NOT a product of stoichiometry?
-Soap
-Chocolate bars
-Gasoline
-None of the above
None of the above