Dojtnjnow What Unit Lol Flashcards
(25 cards)
Isotope definition
An atom of an element with the same number of protons, but a different number of neutrons.
What does atomic number show
Number of protons
What does mass number show
Neutrons + protons
Number of electrons in an atom
Equal to number of protons
Ion definition
An Atom of an element with the same number of protons but a different number of electrons
Relative atomic mass definition
The weighted mean mass of an atom of an element compared to the mass of 1/12 of a carbon-12 atom
Relative isotopic mass definition
The weighted mean mass of an isotope compared to the mass of 1/12 of a carbon-12 atom
Cl: 75% Cl-35, 25% Cl-37
(75 x 35) + (25 x 37)
Amount of substance unit
n
Avogadros number
6.02 x 10^23
One mole of atoms =
12g carbon-12
Molar mass volume defintion
The volume that one mole of a gas occupies at room temperature and pressure
Molar mass volume
24000cm3 / 24dm3
Molar mass =
m / n
Pv=
nRT
Room temperature
298k
Room pressure
101kPa
Pressure(Pa) x volume(m3) =
moles(n) x gas constant x temperature(k)
Gas constant
8.314
m3 to dm3
x1000
m3 to cm3
x1000000
Pa to kPa
/1000
•C to K
+273
Concentration =
Moles / volume
