Balancing Equations
Moles vs Moles
Getting Some Moles
This Many Molecules
Let's Find Grams
100
By definition, the Law of Conservation of Mass states that matter (mass) may not be __________ nor _________ .
created / destroyed
100
What is the mole ratio of hydrogen to water in 2H2+O2-->2H2O ?
2 moles of hydrogen: 2 mole of water (or 2:2)
100
How many moles are in 12 grams of carbon?
1 mole of carbon
100

How many atoms are in 4.4 moles of silver?

2.65 x 10^24 atoms of Ag

100
How many grams are there in 8 moles of water?
144 grams of H2O
200
This is found on the left side of the yields sign. In other words, what goes in to the reaction.
Reactants
200
Given N2 + 3 H2 ---> 2 NH3, what is the mole ratio of NH3 to H2?
2 moles of NH3: 3 moles of H2 (or 2:3)
200
How many moles are in 2.3 grams of phosphorus?
0.074265 moles of phosphorus
200
How many molecules are in 0.7 moles of NH3?
4.2154 x 10^23 molecules of NH3
200
What is the weight, in grams, of 2.3 moles of Cu(OH)2?
224.365 grams of Cu(OH)2
300
Look at the equation. Is it balanced or unbalanced? Na + Cl2 --> NaCl
Unbalanced
300
Given 8 H2 + S8 ---> 8 H2S, what is the mole ratio of H2S to S8?
8 moles of H2S: 1 moles of S8 (or 8:1)
300
How many moles are in 2.45 x 10^23 molecules of CH4?
0.41 moles of CH4
300
How many molecules are in 72g of H2SO4
4.4x10^23 molecules H2SO4
300
How many grams are there in 0.87 moles of FeF3?
98.1795 grams of FeF3
400
____ Fe + ____ HCl --> ____ FeCl2 + ____ H2
__1__ Fe + __2__ HCl --> __1__ FeCl2 + _1___ H2
400
Given 2H2 + O2 ---> 2H2O. If you had 20 moles of H2 on hand and plenty of O2, how many moles of H2O could you make?
20 moles of water
400
How many moles are in 68 grams of copper (II) hydroxide, Cu(OH)2?
0.6969 moles of CU(OH)2
400
How many molecules are in 5.8 moles of MgO?
3.49 x 10^24 molecules of MgO
400
How much does 4.2 moles of Ca(NO3)2 weigh, in grams?
689.22 grams of Ca(NO3)2
500
This type of rxn is where one compound breaks down into two or more simpler elements or compounds.
Decomposition reaction
500
Given N2 + 3 H2 ---> 2 NH3, if 10 moles of NH3 were produced, how many moles of N2 would be required?
5 moles of N2
500
How many moles are in 598.2 grams of bleach (NaClO)?
8.03 moles of NaClO
500
How many molecules of NH4OH are there in 230 grams of NH4OH?
3.96 x 10^24 molecules of NH4OH
500
How many grams of silver are there in 2.3 x 10^24 atoms of silver?
412 grams of silver
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