Short answer/ terms
Relating the quantities of different substances in a chemical equation is called
what is stoichiometry
The ______ formula denotes a simple, whole-number ratio for the atoms in a molecule
what is the empirical formula?
The chemical formula that represents a simple, whole number ratio
what is empirical formula?
The formula that provides the number of each type of atom in a molecule
what is molecular formula?
The number to the left of a substance in a chemical equation
what is the stoichiometric coefficient ?
the chemical that is responsible for stopping reaction
what is the limiting reactant?
to get the simplest, whole number ratio, we must do what mathematical operation to the molecular formula to get the empirical formula?
what is divide by any common factor?
to go from empirical formula to molecular formula we must do what mathematical operation ?
what is multiply by the greatest common factor?
In order to convert an empirical formula into a molecular formula,
you must know the ____ (kind of quantitative measurement)
of the _____s involved
what is the -mass- of the -molecules- ?
the ______ is responsible for determining how much product is produced
what is the limiting reactant?
to go from empirical formula to molecular formula we must know the measure of a molecules what?
(hint we get the info from the periodic table)what is the molecule's mass?
when going from empirical to molecular formula how do we find the factor that we multiply the empirical formula by to get the molecular formula?
(hint look at ex 8.10 on p. 299-300)
what is divide the mass the we need by the mass of the given empirical formula?
_____________'s law states that the stoichiometric coefficients can be used to relate the volume of gases in a chemical in a chemical equation.
-Gay-Lussac-
The limitation of Gay- Lussac's law
what is the law is only applicable to gases?
what is determine the grams of oxygen by subtraction? (this works because the mass of one side of the equation is equal to the mass of the other, law of mass conservation)
64.8 g of oxygen
then find the stoichiometric coefficients by converting from grams to moles,
then make the coefficients integers by dividing by the smallest number
A compound has a formula of CH2O. If the molecular mass is 60.0 amu how do we find its molecular formula?
What is find the mass of CH2O?
the mass is 30.0 amu
then, we need to figure out how to go from 30.0g to 60.0amu
to go from empirical to molecular, between 30.0 and 60.0, we must multiply by two. So, the formula is C2H4O2