Vocabulary
Name the conversion factor relating amounts of moles between substances.
Mole ratio
CO2 + 2LiOH --> Li2CO3 + H2O How many moles of lithium hydroxide are required to react with 20 mol of CO2?
40 mol of LiOH are required.
Mg + 2HCl --> MgCl2 + H2
How many liters of hydrogen will be produced if we use 3 moles of HCL and excess Mg at STP?
33.6 L of hydrogen
Mg + 2HCl --> MgCl2 + H2
How many grams of H2 are produced from the reaction of 75 g HCl (MM=36.5 g/mol) and excess Mg?
2 grams of H2 are produced
N2 + 3H2 --> 2NH3
28 grams of nitrogen are reacted with an excess of hydrogen. The theoretical yield is 34 grams of 2NH3, but only 27 grams are produced. What is the student's percent yield?
The percent yield is 79.4%
What is molar mass?
Molar mass is the sum of the mass of a substance in grams.
6CO2 +6H2O --> C6H12O6 + 6O2 How many moles of carbon dioxide are needed to react with 3.25 mol of water in the reaction described above?
3.25 mol of CO2
Mg + 2HCl --> MgCl2 + H2
How much HCL (MM=36.5 g/mol) is needed to react with 2.50 moles of magnesium?
182.5 grams of HCl
2KClO3 --> 2KCl + 3O2
How many grams of KCl are produced if 5 grams of KClO3 are decomposed?
3 grams of KCL are produced
What is Avogadro's number?
Avogadro's number is 6.02 x 10^23?
What is the limiting reactant?
The limiting reactant is the reactant that determines how much product is produced.
2Mg +O2 --> 2MgO How many moles of magnesium oxide are produced from 1.2 moles of oxygen?
2.4 moles of magnesium oxide are produced
How many moles of Al are needed to combine with 1.5 mol of O2 to make Al2O3?
2 moles of Al
Determine the grams of NaCl that can be produced from 23 g of sodium and excess chlorine.
56 grams of NaCl can be produced
How many moles are present in 127.5 grams of NaNO3?
1.5 moles are present
What is percent yield?
Percent yield is the (actual yield divided by theoretical yield) times 100.
How many moles of ammonia (NH3) are produced when 6 mol of hydrogen gas completely reacts with nitrogen gas?
4 moles of NH3 are produced
How many moles of H2 are formed by the decomposition of 5 moles of NH3?
7.5 moles of H2
How many grams of Na2SO4 (MM=124 g/mol) will be produced from 200 g NaOH (MM=40 g/mol) and an excess of H2SO4?
2NaOH + H2SO4 -> 2H2O + Na2SO4 (Balanced)
355 grams of Na2SO4 will be produced
Cl2 + KBr -> KCl + Br2 (At STP, unbalanced)
How many liters of Br2 will be produced from 238 g of KBr with excess Cl2?
22.4 L of Br2 will be produced
What is the law of conservation of mass?
The law of conservation of mass states that mass is neither created or destroyed.
How many moles of oxygen are needed to produce 5.0 moles of water?
2.5 mol of oxygen are required
Determine the limiting reactant when 5 moles of Al2O3 reacts with 7 moles of Fe.
Al2O3 + Fe -> Fe3O4 + Al (Unbalanced)
Fe is the limiting reactant
15 g CuCl2 (MM=134.5 g/mol) reacts with 20 g NaNO3 (MM=85 g/mol). How any grams of NaCl (MM = 58.5 g/mol) are formed?
CuCl2 + 2NaNO3 -> Cu(NO3)2 + 2NaCl
13 g of NaCl are formed
What day is our final?