1 AMS Flashcards
Proton number
Number of protons
Nucleon number
Number of neutrons and protons
Isotopes
Atoms of the same element with the same number of protons but different number of neutrons
Relative isotopic mass
The mass of 1 mol of atoms of an isotope (of a certain element) relative to 1/12 the mass of 1 mol of carbon-12 atoms
Relative atomic mass
The mass of 1 mol of atoms of an element relative to 1/12 the mass of 1 mol of carbon-12 atoms
Relative molecular mass
The mass of 1 mol of molecules relative to 1/12 the mass of 1 mol of carbon-12 atoms
Relative formula mass
The mass of 1 formula unit of 1 mol of compound relative to 1/12 the mass of 1 mol of carbon-12 atom
Avogadro constant
6.02*10^23 mol^-1
Mole
One mole of substance contains exactly 6.02*10^23 elementary entities
Molar mass
Mass of 1 mol of a specified substance
units: g mol^-1
numerically equal to atomic/molecular mass
s.t.p.
273K (0°C) and 1 bar (10^5 Pa)
molar gas volume=22.7 dm^3 mol^-1
r.t.p.
293 (20°C) and 1 atm (101325 Pa)
molar gas volume=24 dm^3 mol^-1
Dilution
The amount of solute remains constant, but volume of solution increases
Empirical formula
The formula of a chemical compound that shows the simplest whole-number ratio of the number of atoms of each element present in the substance
Molecular formula
The formula of a chemical compound that shows the actual number of atoms of each element present in 1 molecule of the compound
