e. The one formula is double the formula of the other. Thus, the smaller molecule dimerizes
to produce the larger molecule.
You get 1 point if you “combined” two of the smaller molecules.Total your points. There are 9 points possible.Rapid Review
The mole is the amount of substance that contains the same number of particles as
exactly 12 g of carbon-12.
Avogadro’s number is the number of particles per mole, 6.022 × 1023 particles. A mole is also the formula (atomic, molecular) mass expressed in grams. If you have any one of the three—moles, grams, or particles—you can calculate the
others.
The empirical formula indicates which elements are present and the lowest
whole-number ratio.
The molecular formula tells which elements are present and the actual number of each. Be able to calculate the empirical formula from percent composition data or quantities
from chemical analysis.
Stoichiometry is the calculation of the amount of one substance in a chemical equation
by using another one.
Always use the balanced chemical equationin reaction stoichiometry problems. Be able to convert from moles of one substance to moles of another, using the
stoichiometric ratio derived from the balanced chemical equation.
In working problems that involve a quantity other than moles, sooner or later it will be
necessary to convert to moles.
The limiting reactant is the reactant that is used up first. Be able to calculate the limiting reactant by the use of the mol/coefficient ratio. Percent yield is the actual yield (how much was actually formed in the reaction) divided
by the theoretical yield (the maximum possible amount of product formed) times 100%.
A solution is a homogeneous mixture composed of a solute (species present in smaller
amount) and a solvent (species present in larger amount).
Molarity is the number of moles of solute per liter of solution. Be able to work reaction stoichiometry problems using molarity. Always use the balanced chemical equationin reaction stoichiometry problems.Stoichiometry 101