Chapter 3 Flashcards
What is Avogadro’s constant? (Given on data sheet)
The number of carbon -12 atoms that are in exactly 12g of carbon-12. It is 6.02 x 10²³
What is molar mass?
The mass of one mole of substance. It has units of gmol-¹
Define Relative isotopic mass
The mass of an atom of an isotope relative to 1/12 th of the mass of an atom of c-12
Define Relative atomic mass
The weighted means of mass of an atom of an element relative to 1/12th of an atom of C-12
Define Relative molecular mass
The mass of a molecule relative to 1/12th of the mass of an atom of C-12
Define Relative formula mass
The mass of a formula unit relative to 1/12th of the mass of an atom of C-12 (applies to giant structures)
Define Anhydrous
Containing no water molecules
Define hydrated
A crystalline (solid) compound containing water molecules
Define water of crystallisation
Water molecules that are bound into a crystalline structure of a compound
One mole of any gas occupies the same ____ at room temp and pressure
Volume
Name the formula for % atom economy
(mass desired product/mass all products) x100
Name the formula for Number of moles from mass
N= mass/ molar mass
Name the formula for finding the number of moles in solutions
N= concentration in mol dm-³ X volume in dm³
Name the gas formula
Pressure (Pa) x Volume(m3) = moles x Gas constant x temperature (k)
Name the gas formula at room pressure and temp
N = Volume (dm³) /24 or N= Volume (cm³)/ 24000