Stoichiometry review + Molarity + Yield

Front

What is stoichiometry?

Back

Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the conservation of mass.

Front

How do you convert atoms to moles?

Back

To convert atoms to moles, divide the number of atoms by Avogadro's number (6.022 x 10^23).

Front

What is the formula for calculating molarity?

Back

Molarity (M) = moles of solute / liters of solution.

Front

What is a limiting reactant?

Back

A limiting reactant is the substance that is completely consumed in a chemical reaction, limiting the amount of product formed.

Front

What is an excess reactant?

Back

An excess reactant is a substance that is not completely used up in a chemical reaction, remaining after the reaction has finished.

Front

How do you calculate percent yield?

Back

Percent Yield = (actual yield / theoretical yield) x 100.

Front

What is the relationship between moles and grams?

Back

To convert moles to grams, multiply the number of moles by the molar mass of the substance.

Front

If 2H2 + O2 → 2H2O, how many moles of H2O are produced from 4 moles of O2?

Back

4 moles of H2O are produced.

Front

What is the significance of Avogadro's number?

Back

Avogadro's number (6.022 x 10^23) is the number of atoms, molecules, or particles in one mole of a substance.

Front

What does it mean if a reaction has a percent yield of over 100%?

Back

A percent yield over 100% indicates an error in measurement or calculation, as it is impossible to produce more product than theoretically possible.