Rules and Laws
what does the law of conservation of mass state?
Matter can never be created or destroyed
2 KClO3 -->2 KCl + 3O2
How many moles of O2 will be formed from 1.65 moles of KClO3?
2.48 Mol O2
4 Fe + 3 O2 --> 2 Fe2O3
How many moles of Fe2O3 are produced when 0.275 moles of Fe are reacted?
0.138 moles Fe2O3
Al + HCl --> AlCl3 + H2
2Al + 6HCl --> 2AlCl3 + 3H2
If the mass of my reactants weigh 217 grams, how much should the mass of my products weigh and why?
217 grams b/c law of conservation of mass
What is the setup for all grams to grams problems
molar mass to mole ratio to molar mass
C2H6O + 3O2 --> 2 CO2 + 3H2O
What is the mole ratio of H2O/C2H6O?
3:1
C2H6O + 3O2 --> 2 CO2 + 3H2O
How many grams of CO2 will be produced from 17 moles of O2?
498.67 grams of CO2
Balance the following chemical equation:
CH4 + O2 --> H2O + CO2
CH4 + 2O2 --> 2H2O + CO2
C2H6O + 3O2 --> 2 CO2 + 3H2O
determine the mole ratio of CO2 /O2
2:3
when solving a mole to mole problem you should always use what conversion factor?
mole ratio
C2H6O + 3O2 --> 2 CO2 + 3H2O
How many grams of O2 is needed to produce 126 grams of H2O?
223.75 grams of O2
2 H2O --> 2 H2 + O2
How many grams of H2O are needed to create 18 moles of H2?
324.36 grams of H2O
Balance the following chemical equation:
V2O5 + HCl --> VOCl3 + H2O
V2O5 + 6HCl --> 2VOCl3 + 3H2O
What is a mole & why do we use it?
A mole is a numerical value of 6.022 X 1022. We use it because when dealing with atoms and molecules the numbers would be so large that it would be very hard to comprehend with out using a unit of measurment.
What is the rule for writing scientific notation? How would you write this number in scientific notation?
2,253,460
Using a decimil point make the given number between 1.0-9.999 then multiply it by the proper power of 10.
2.253460 X 106
4 Fe + 3 O2 -->2 Fe2O3
How many grams of O2 are needed to react with 125 grams of Fe?
53.7 grams O2
4 Fe + 3 O2 -->2 Fe2O3
How many grams of Fe2O3 are produced when 42.7 grams of Fe is reacted?
61 grams Fe2O3
Balance the following chemical equation:
H3PO4 + HCl --> PCl5 + H2O
H3PO4 + 5HCl --> PCl5 + 4H2O
What is this number in scientific notation
0.00000067432
6.7432 X 10-7
How do you determine which conversion unit to use first in a 2 step problem?
if you are given grams use molar mass. if you are given moles use mole ratio
2 C4H10 + 13 O2 --> 8 CO2 + 10 H2O
How many grams of CO2 are produced from the combustion of 100 grams of C4H10?
303 grams CO2
2 C4H10 + 13 O2 --> 8 CO2 + 10 H2O
How many grams of H2O are produced when 5.38g of O2 is reacted?
2.33 grams H2O
Balance the following chemical equation:
CO + H2 --> C8H18 + H2O
8CO + 17H2 --> 1C8H18 + 8H2O
How does the law of conservation of mass relate to the theoretical yield of a chemical equation?