Balancing Equations
Limiting/ Excess Reactant
Mole Ratio
Mole-Gram and Gram-Mole
Conversion
Gram-to-Gram Conversion
100
_____ Li2SO4 + _____ K3PO4 → _____ Li3PO4 + _____ K2SO4
What is 3 Li2SO4 + 2 K3PO4 → 2 Li3PO4 + 3 K2SO4
100
You are making a turkey sandwich. It takes 2 pieces of bread, 4 pieces of turkey, 1 packet of mayonaisse, and 1 packet of mustard. What is the limiting reactant if you have 54 pieces of bread, 108 pieces of turkey, 20 packets of mayonaisse and 27 packets of mustard.
What is Mayonaisse
100
Given the reaction: 6 Mg + P4 → 2 Mg3P2 How many moles of P4 are needed to react with 84 moles of Mg?
What is 14 moles of P4
100
How many grams are in 238 moles of arsenic?
What is 17,800g AS
100
For the reaction whose balanced equation is as follows, find how many grams of zinc phosphate will be produced by the reaction of 5.00 grams of ammonium phosphate. 3 ZnCl2 + 2 (NH4)3PO4  Zn3(PO4)2 + 6 NH4Cl
What is 6.48 g Zn3 (PO4 )2
200
_____ Ca + _____ CuF2 → _____ CaF2 + _____ Cu
What is 1 Ca + 1 CuF2 → 1 CaF2 + 1 Cu
200
You are making a ham sandwich. It takes 3 pieces of ham, 1 piece of cheese, and 2 pieces of bread to make it. What is the excess reactant when you have 15 pieces of ham, 45 pieces of cheese, and 10 pieces of bread?
What is Cheese
200
Give the reaction : 4 Fe + 3 O2 → 2 Fe2O3 How many moles of Fe do you need if you wish to produce 7 moles of Fe2O3?
What is 14 moles of Fe
200
How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)3?
What is 1.26 moles Al(OH)3
200
Nitrogen and hydrogen react to form ammonia gas according to the following equation. N2 + 3H2 --> 2NH3 If 56.0 grams of nitrogen are used up by the reaction, how many grams of ammonia will be produced?
What is 68.0 g NH3
300
_____ S8 + _____ O2 → _____ SO2
What is S8 + 8O2 --> 8SO2
300
You are making a s'more. It takes 2 graham crackers, 1 marshmallow, and 4 pieces of chocolate. You have 20 graham crackers, 20 marshmallows and 40 pieces of chocolate. What is the excess reactant and how much of the excess reactant would you have left over?
What is 10 Marshmallows
300
Give the reaction : 4 Fe + 3 O2 → 2 Fe2O3 How many moles of O2 are needed if we wish to make 8 moles of Fe react?
What is 6 Moles of O2
300
How many grams are in 2.4 moles of sulfur?
What is 77g S
300
For the reaction whose balanced equation is as follows, find the number of grams of I2 that will be formed when 300.0 g of bromine react. 2 KI + Br2  2 KBr + I2
What is 476.5 g I2
400
_____ N2 + _____ H2 → _____ NH3
What is N2 + 3H2 --> 2NH3
400
You are making a hamburger. It takes 2 buns, 1 patty, and 2 pieces of lettuce. What is the limiting reactant when you have 14 buns, 7 patties, and 12 pieces of lettuce?
What is Lettuce
400
Consider the combustion of methane (CH4). How many moles of carbon dioxide are obtained when 20 moles of methane are burned?
What is 5 moles of Carbon
400
How many grams are in 4.5 moles of sodium fluoride, NaF?
What is 190g NaF
400
Aluminum metal reacts with zinc chloride to produce zinc metal and aluminum chloride. 2Al +3ZnCl2 --> 3Zn + 2AlCl3 A mass of 45.0 grams of aluminum will react with how many grams of zinc chloride?
What is 341 g ZnCl2
500
_____ K + _____ F2 → _____ KF
What is 2K + F2 --> 2KF
500
If it takes one hot dog bun and one hot dog weenie to make a hot dog, how many hot dogs can you make if you have 7 hot dog buns and 4 hot dog weenies?
What is 4 Hot Dogs
500
Consider the following chemical reaction: N2 + 3 H2 → 2 NH3 How many moles of nitrogen gas are needed to react with 9 moles of hydrogen?
What is 3 Moles of Nitrogen Gas
500
How many moles are in 2.3 grams of phosphorus?
What is 0.074 moles P
500
For the reaction whose balanced equation is as follows, find the number of grams of sodium that must react to produce 42.0 grams of sodium oxide. 4 Na + O2  2 Na2O
What is 31.2 g Na
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