Percent Yield
What is the formula for determining percent yield?
(Actual yield / Theoretical yield) x 100%
What is a mole? Where can you find an atom's molar mass?
A mole is the number of grams of an atom there are in one mole of that atom (6.022x1023 atoms)
It is on the periodic table
acid + base = ?
A salt and water
What is the equation used to determine molality?
molality (m) = mol of solute / kg of solvent
What occurs during oxidation? Reduction?
Oxidation = loss of electrons to increase oxidation number
Reduction = gain of electrons to decrease its oxidation number
When reacting Na with Cl2, we calculated that the theoretical yield should be 12.5 grams. Our actual yield was 13.0 grams. What is the percent yield?
percent yield = 104%
Calculate the molar mass of Zn(C2H3O2)2.
183.5 g/mol
What is the endpoint of a titration?
Where the amount of acid and base are balanced
What is the molality of a solution containing 3.5 moles of LiO in 400 kg of water?
m= 8.75 mol/kg
What is the oxidation number of Sulfur in Na2SO4?
+6
Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.
percent yield = 85%
Balance this reaction: ____ RbNO3 + ____ BeF2 ----> ____ Be(NO3)2 + ____ RbF
2, 1, 1, 2
Identify the products of the chemical equation
3 LiOH + H3PO4 = ?
Li3PO4 + 3H2O
If a solution has a molality of 3.4 and 690 grams of water, how many moles of CaCl2 are present in the solution?
2.346 moles
What is the oxidation number of carbon in CaCO3?
+4
A reaction was predicted to produce 32.4 grams of a compound. When the product was measured, there were only 26.1 grams made. What is the percent yield?
percent yield = 80.6%
B2H6 + 3 O2 → 2 HBO2 + 2 H2O
What mass of O2 will be needed to burn 36.1 g of B2H6?
124g O2
I am titrating 1M HCl with 1M NaOH. I have 25mL of HCl. How much NaOH will I need?
25mL
If a solution contains 23.6 moles of AgS with a molality of 2.1, how many kilograms of the solution are present?
11.24 kg of solution
What is the oxidation number of both oxygen and Hydrogen in H2O2?
O = -1 (-2)
H = +1 (+2)
TiS + H2O → H2S + TiO
b. What is my percent yield of titanium(II) oxide if my actual yield is 22 grams and I started with 20 grams of titanium (II) sulfide?
percent yield = 137.5%
When 12 moles of O2 reacts with 1.1 mole of C10H8 what is the limiting reactant? C10H8 + 12 O2 → 10 CO2 + 4 H2O
Limiting reactant = Oxygen
I have 25mL of 1M HCl which neutralises 20mL of NaOH. What is the concentration of the NaOH?
What is the molality of a solution containing 28.4 grams of NaCl in 1600 grams of water?
m = 0.304 mol/kg
Identify the element being oxidized in the following reaction.
FeCl3 + 3Ag(s) = 3AgCl + Fe(s)
Oxidized element = Ag
Reduced element = Fe