Moles
A weather balloon contains 25 moles of Helium (He) gas.How many grams of Helium are in the water ballon
100 grams
Consider the reaction where Hydrogen gas reacts with Oxygen to form water: 2H2+O2→2H2O. If you start with 4 moles of H2, how many moles of O2 are needed for a complete reaction?
2 moles
2H2 + O2 --> 2H20
If you have 10 moles of Hydrogen (H2), how many moles of Oxygen (O2) do you need to react with it completely?
ratio: 2 moles of H2 : 1 mole of O2
Answer: 5 Moles
Equation: 2H2 + O2 ---> 2H2O
You have 10 moles of H2 and 7 moles of O2
Which is the limiting reactant, and how many moles of H2O can you make?
H2 is limiting; you can make 10 moles of H2O.
You have a tube of Magnesium with a mass of 48.62 grams. How many moles of Magnesium are present?
2 moles
In the reaction N2 + 3H2 --> 2NH3, if you produce 10 moles of Ammonia (NH3), how many moles of Nitrogen (N2) were used?
5 moles
If you produce 6 moles of Water (H2O), how many moles of Hydrogen (H2) did you start with?
ratio: 2 moles of H2 : 2 moles of H2O
answer:6 moles of H2
Equation: C + O2 ---> CO2
You have 3 moles of Carbon and 5 moles of Oxygen gas.
Which is the limiting reactant, and how many moles of CO2 are produced?
Carbon is limiting; you produce 3 moles of CO2.
A specialized neon sign contains 0.5 moles of Neon gas. What is the mass of the gas in grams?
10.09 grams
You react 54.0 grams of Aluminum (Al) with excess Oxygen to form Aluminum Oxide (4Al + 3O2 -->2Al2O3). How many moles of Aluminum are you starting with? (Atomic mass of Al = 27.0 g/mol)
2 moles
Half court shot?(5 points)
N2 + 3H2 --> 2NH3
You want to produce 8 moles of Ammonia (NH3). How many moles of Hydrogen gas (H2) are required?
ratio: 3 moles of H2 : 2 moles of NH3
Answer: 12 moles of H2
N2 + 3H2 ----> 2NH3
You have 2 moles of N2 and 9 moles of H2.
What is the mass of Ammonia (NH3) produced?
N2 is limiting: You make 68 grams
Take 2 shots!
A high-tech laboratory has a sample of Gold (Au) containing 1.8066x1024 atoms. How many moles of Gold are in the sample?
3 moles
Double points!
Using the reaction C+O2→CO2, if you burn 60.0 grams of Carbon (C), how many moles of Oxygen gas (O2) are consumed? (Atomic mass of C = 12.0 g/mol)
5 moles
Three pointer!
2Na + 2HCl ---> 2NaCl + H2
You drop a piece of Sodium (Na) into the acid, and it produces exactly 3 moles of Hydrogen gas (H2). How many grams of Sodium did you start with?
ratio: 2:1
Answer: 138 grams
Double Points!
2Mg + Cl2 -----> MgCl2You have 48.6 grams of Mg and 5 moles of Cl2
How many moles of MgCl2 are formed?
Mg is limiting; you form 2 moles of MgCl2
Double points!!!
A pure copper pipe has a mass of 127.10 grams. Calculate the total number of atoms in the pipe. This is a two-step equation
1.2044x1024
three pointer!
Iron reacts with Oxygen to form rust 4Fe + 3O2 ---> 2Fe2O3. If you have 1.2044x1024 atoms of Iron (Fe), what mass of Iron do you have?
(Atomic mass of Fe = 55.85 g/mol, Avogadro's Number = 6.022x1023)
111.70 grams
Triple points!!
4Al + 3O2 ---> 2Al2O3
You have 162 grams of Aluminum (Al). How many moles of Oxygen (O2) are required to react with all of it?
Answer: 6 moles of Al
Ratio 4: moles of Al to 3 moles of O2.
Answer:4.5 moles of O2
Triple points
2Al + 3S ----> Al2S3
You have 108 grams of Aluminum and 6 moles of Sulfur
Which is limiting, and how many grams of the excess reactant are left over?
They are in a perfect ratio! Neither is limiting; both are consumed completely.
You produce 2 moles of Al2S3
Half Court?? (5 points)