Stoichiometry Flashcards
And charge if possible
What is ammonium’s formula?
NH4+
and charge if possible
What is Nitrates formula?
NO3-
And charge if possible
What is hyrdroxide’s formula?
OH-
And charge if possible
What is Carbonate’s formula?
CO3 2-
And charge if possible
What is sulphate’s formula?
SO4 2-
What is molecular formula?
The formula to the number of atoms per element in a molecule
What is empirical formula?
The simplest whole number ratio of the different atoms or ions in a compound.
How to convert molecular formula to emperical formula?
motherfuc-ing nigg-s enough fuc-ing
molecular formula=n(emperical formula)
how to get moles when you have molar mass and emperical formula’s mass?
n=molar mass / emperical formula mass
What are the four state symbols and how do they look?
liquid (l),Solid(s),gas(g),aquaeous(aq)
when a compound ends with -ide what does it mean?
Contains only 2 different elements
when a compound ends with -ate what does it mean?
it contains oxygen
What is the relative atomic mass?
the average mass of the isotopes of an element compared to 1/12th of the mass of the atom carbon-12
What is the relative molecular mass?
The sum of all the relative atomic masses of all atoms in one molecule of the compound
What is avogradrah’s constant?
and what is it’s number?
the number of particles in a mole
6.02x10^23
What is the equation to moles?
moles=mass/molar mass
what does dm^3 represent?
decimeter cube, it is a unit of volume and It is equal to 1000cm^3 or 1 litre
how many dm^3 is in a gas?
24dm^3
What is the formula for volume of gas in r.t.p?
volume=number of moles x 24dm^3
What are the 2 units of concentration?
And how do you convert them?
g/dm^3 and mol/dm^3
By multiplying them by their respective molar mass
How do you find the percent composition by mass?
100x(Mass of element/molecular mass)
= percent compositon by mass
How do we find the purity of a certain substance?
100x(mass of pure product/mass of impure compound)
= purity
How to find percentage Yield?
100x(actual mass obtained/calculated mass)
= % yield
