8.1
2 H₂ + O₂ → 2 H₂O
How many moles of water can you make from 14.4 moles of oxygen?
28.8 mol H2O
Define limiting and excess reactants.
The limiting reactant is the reactant that runs out, it determines the theoretical yield. The excess reactant is the reactant you have more of after the reaction is complete.
Define percent yield. Include the formula.
Percent yield compares the amount of product collected to what was supposed to be collected, measuring the efficiency of the reaction. The formula is actual yield divided by theoretical yield multiplied by 100.
What is molarity? Draw a model to support your answer.
The amount of moles of a solute per liters of a solution. It measures concentration. (Models will vary)
What is the purpose of a titration?
To find an unknown concentration of a solution (analyte).
Zn + 2 HCl → ZnCl₂ + H₂
You begin with 5.5 moles of hydrochloric acid. How many grams of zinc chloride could you make?
370 grams ZnCl2
2 H₂ + O₂ → 2 H₂O
If you have 18 moles of hydrogen and 14 moles of oxygen, which reactant is limiting?
Hydrogen
If the theoretical yield of a reaction is 53 grams, and the reaction yielded 39 grams, what is the percent yield?
74%
Calculate the molarity of an NaOH solution that has 2.4 mol in 3.1 L of solution.
0.77 M
Name the three solutions involved in a titration and their purpose.
Analyte- solution with unknown concentration
Titrant- solution with known concentration that we are slowly adding in to determine analyte concentration
Indicator- changes color at the conclusion of the titration
4 Fe + 3 O₂ → 2 Fe₂O₃
You created 45.9 grams of iron (III) oxide. How many liters of oxygen did you start with?
9.66 L O2
AgNO₃ + NaCl → AgCl + NaNO₃
If you react 70 grams of silver nitrate with 23 grams of sodium chloride, which is the limiting reactant?
Sodium chloride
A reaction was calculated to yield 70.4 grams of carbon dioxide, but only yielded 1.2 moles of carbon dioxide. What is the percent yield?
75%
How many moles are in 200 mL of a 4.7 M solution?
0.9 moles
You titrate 61 mL of an HCl solution with 94 mL of 0.11 M NaOH. What is the concentration of the HCl solution?
0.17 M HCl
You burn 6.5 grams of propane (C3H8) in a combustion reaction. How many liters of carbon dioxide did you create?
9.9 L CO2
If you react 47 grams of barium chloride with 18 grams of sodium sulfate, what is the theoretical yield of sodium chloride in grams?
15 grams
The percent yield of a reaction was calculated to be 44.3%. If the theoretical yield was 95.4 grams, what was the actual yield?
42.3 grams
187.5 mL (190 mL)
A 35.0 mL sample of 0.40 M lead (II) nitrate reacts with excess potassium iodide. What is the mass of precipitate formed?
6.5 grams PbI2
You react 14.9 grams of sodium phosphate with excess magnesium chloride. How many molecules of sodium chloride can you make?
1.64 x 1023 molecules NaCl
If you react 14.5 grams of aluminum with 84.3 grams of copper (II) chloride, what is the theoretical yield of copper, in grams?
39.8 grams Cu
Cite three laboratory errors that could cause the percent yield to not be 100%. Explain how they are errors.
Answers will vary
A student is trying to create a 3.0 M hydrochloric acid solution. They need 100 mL of the solution. How many grams of hydrochloric acid do they need?
10.9 grams (10 g)
75 mL of sulfuric acid is titrated with 56 mL of 0.2 M NaOH. What is the concentration of sulfuric acid?
0.07 M H2SO4