CONVERSIONS
What do you use when you convert moles to moles?
What is the Mole Ratio?
The chemical that is entirely used up in a chemical reaction?
What is Limiting Reactant?
How many grams are in 2 moles of Ca?
What is 80.16 g?
2 mol Ca x (40.08 g Ca/ 1 mol Ca) = 80.16 g Ca
What do you use when you convert moles to grams or grams to moles?
What is Molar Mass?
The relationship between the numbers of molecules in a chemical equation. This is found by looking at the coefficients.
What is the Mole Ratio?
Example: 2H2 + O2 --> 2H2O
The mole ratio between H2 and O2 is 2/1
How many grams does 8.70 moles of H2O weigh?
What is 157 grams?
Molar mass H2O: 2(1.008) + 15.998 = 18.02
8.7 mol H2O x (18.02 H2O/1 mol H2O) = 157 grams H2O
What are the given units in this problem?
How many moles of O2 are needed to react with 3 moles of H2?
2H2 + O2 --> 2H2O
What is Moles of H2?
The amount of product that is made in an experiment.
What is Actual Yield?
How many moles of CO are needed to react with 3 moles of Fe3O4?
Fe3O4 + 4CO --> 3Fe + 4CO2
What is 12 moles of CO?
3 mol Fe3O4 x (4 mol CO/1 mol Fe3O4) = 12 mol CO
What are the desired units in this problem?
How many moles of O2 are needed to react with 3 moles of H2?
2H2 + O2 --> 2H2O
What is Moles of O2?
The maximum amount of product that you predict can be made.
What is Theoretical Yield?
How many grams of NaCl will be produced from 1.25 mol of chlorine gas reacting with excess sodium?
2Na + Cl2 --> 2NaCl
What is 146 g NaCl?
1.25 x (2/1) = 2.5 moles of NaCl
2.5 x (58.44 g/mol) = 146 g NaCl
How many steps are in a grams to grams stoichiometry problem?
What is 3?
Grams of A --> moles of A
Moles of A --> moles of B
Moles of B --> grams of B
The reactant that is leftover after a chemical reaction.
What is Excess Reactant?
How many grams of nitrogen are produced from the decomposition of 13.0 grams of NH3?
2NH3 --> 3H2 + N2
What is 10.7 grams N2?
13 grams NH3 is 0.763 moles
0.763 moles x (1/2) = 0.382 moles N2
0.382 moles of N2 weighs 10.7 grams