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Stoichiometry
Limiting Reagent
% Yield
Potpourri
100
________ and _________ are conserved in every chemical reaction.
Mass and atoms
100
The reagent that is not completely used up in a reaction is called the _________________.
excess reagent
100
The maximum amount of product that could be formed from given amounts of reactants is the _____________________.
theoretical yield
100
A _________________ is a conversion factor derived from the coefficients of a balanced chemical equation.
mole ratio
200
How many moles of CaC2 are needed to react completely with 49.0 g H2O? CaC2 + 2H2O --> C2H2 + Ca(OH)2
1.36 mol CaC2
200
The reagent that determines the amount of product in a reaction is called the _________________.
Limiting reagent
200
The amount of product that forms in the lab is referred to as the ___________________ yield.
actual yield
200
How many moles of Al2O3 are formed when 0.78 mol O2 reacts with aluminum? 4Al + 3 O2 --> 2Al2O3
0.52 mol
300
How many liters of oxygen are required to burn 3.86 L of carbon monoxide? 2CO + O2 --> 2CO2
1.93 L O2
300

             N2H4 + O2 --> N2 + 2H2O

Before     4g        2g       0g     0g

After        0.01g   0g       1.2     3.4g

What is the limiting reactant?

O2
300

During photosynthesis, 16 grams of water reacts with excess carbon dioxide should make make 27.5 grams. What is the % yield if 19.4 grams of glucose is produced in the lab?

70.5%

300
How many liters of phoshine are formed when 0.42 L of hydrogen reacts with phosphorus? P4 + 6H2 --> 4PH3 (phosphine)
0.28 L PH3
400
How many grams of nitrogen dioxide must react with water to produce 5.00 x 10^22 molecules of nitrogen monoxide? 3NO2 + H2O --> 2HNO3 + NO
11.5 g NO2
400

Identify the limiting reagent if 1.90 mol C2H4 reacts with 5.30 mol of O2. You were left with leftover C2H4 and.      C2H4 + 3O2 --> 2CO2 + 2H2O

O2

400

If nitrogen reacts with oxygen should produce 16.2 grams, but in lab, the students only measured 6.2 grams. What is the % yield of this reaction?

38.3%

400
How many grams of NaCl are needed to make a 250 ml sample of a 2.2 Molar solution?
32.2 g
500
Calculate the Liters of Oxygen produced when 24 grams of KClO3 decomposes. 2KClO3 --> 2KCl + 3O2
6.58 L O2
500

In the reaction, 2Al + 3Cl2 --> 2 AlCl3, the student mixes 2 grams of Al with 3 grams of Cl2. After the reaction stops, there no more Al, give the correct statement to describe why the reaction stopped.

Al was the limiting reactant because it ran out stopping the reaction

500
The theoretical yeild of a reaction was 6.60 grams of product. If the % yield was 70.5%, what was the actual yield of product formed?
4.65 g
500
How many grams of glucose (C6H12O6) are needed to make a 150 ml sample of a 1.5 Molar solution.
40.5 g