Stoichiometry

Mix

100

This is the branch of chemistry that deals with mass relationships in compounds and reactions.

What is Stoichiometry

200

In a chemical reaction, these numbers can be used to determine the mole ratio of any reactants and/or products.

What are coefficients?

300

These are the units of molar mass.

What is g/mol.

400

How many moles are present in 34 grams of Cu(OH)2?

What is 0.35 mol Cu(OH)2?

500

This is the molar mass of Copper(II) Sulfate.

What is a 160 g/mol?

Moles

100

This is the coefficient of hydrogen gas in the balanced form of the following reaction: H2 + O2 --> H2O

What is 2

200

This is the coefficient in front of nitrogen gas in the correctly balanced form of the equation: (NH4)NO2 --> N2 + H2O

What is 1

300

This is the amount of moles of water that are made from complete reaction of 2.2 moles of oxygen gas with hydrogen gas Given the reaction: 2H2 + O2 → 2H2O

What is 4.4 moles

400

This is the amount of moles of H2 that can be made from the complete reaction of 3.0 moles of Al Given: 2 Al + 6 HCl → 2 AlCl3 + 3 H2

What is 4.5 moles

500

This is how many moles of LiOH are required to react 20 moles of CO2 in the following reaction: CO2 + 2LiOH --> Li2CO3 + H2O

What is 40 moles.

Stoich

100

This is the amount of magnesium chloride produced (in grams) if 20.0 g of magnesium react with excess hydrochloric acid Mg + HCl -------> MgCI2 + H2

What is 39.2 grams

200

This is the amount of lithium nitride produced if 5.50g of Lithium reacts with an excess of nitrogen gas. The reaction: 6Li + N2 --> 2Li3N

What is 9.16 grams

300

This is the amount of calcium carbonate produced when a chemist reacts 14.4g of CaO with an excess of CO2 in the following reaction:

CO2 + CaO --> CaCO3

What is 25.7 grams.

400

This is the amount (in grams) of zinc chloride produced from the reaction of 202.7 grams of lithium chloride and an excess of zinc.

Zn + LiCl --> ZnCl2  + Li  (unbalanced)

What is 329 g

500

This is the amount (in grams) of aluminum oxide produced from the reaction of 0.353 grams solid aluminum with an excess of oxygen gas.

What is 0.663 grams.

Chemical Equations

100

Balance the following equation:

KClO3 --> KCl + O2

What is 2KClO3 --> 2KCl + 3O2

200

States that mass is neither created nor destroyed during ordinary chemical or physical reactions. (This is why we balance chemical equations!)

What is The Conservation of Mass

300

In the reaction represented by the equation 2Al2O3 --> 4Al + 3O2, this is the mole ratio of Aluminum to Aluminum Oxide.

What is 4 mol Al/ 2 mol Al2O3

400

What kind of reaction is the following:

B2O3 + H2O --> B(OH)3

What is synthesis or combination.

500

Write the complete balanced equation for the following reaction: When lithium hydroxide pellets are added to a solution of H2SO4, lithium sulfate and water are formed.

What is: 2LiOH (s) + H2SO4 (aq) --> Li2SO4 (aq) + 2H2O (l)

% Yield

100

The percent yield tells you a relationship between the _________ yield and actual yield of a certain product.

What is theoretical

200

This is the actual amount of grams produced f the theoretical yield of a reaction is 42.0 grams of product and the percent yield is 75%.

What is 32 g

300

This is the percent yield when a sample of 8.5 g NH3 on oxidation produces 4.5 g of NO. Reaction: 4 NH3 + 5 O2 → 4 NO + 6 H2O

What is 30 %

400

  This is the percent yield if 155 grams of calcium carbonate is treated with hydrochloric acid and 142 grams of calcium chloride is obtained? CaCO3 + HCl → CaCl2 + CO2 + H2O

What is 56.6%

500

This is the percent yield of CuS given that you start with ? 15.5 g Na2S and ? 12.1 g CuSO4. The actual amount of CuS produced was ?3.05g . Reaction: Na2S + CuSO4 → Na2SO4 + CuS

What is 42.1%?