Chapter 4 - The Mole & Volumetric Analysis Flashcards
What is relative atomic mass (of an element)?
The average mass of one atom of the element relative to 1/12 of the mass of a carbon-12 atom
What is the symbol for relative atomic mass?
Ar
What is the unit for relative atomic mass?
no unit
The relative atomic mass of an element takes into account the mass of all the ________ of the element and their ________
isotopes
relative abundance
What is relative molecular mass (of a molecule)?
The average mass of one molecule of the element or compound relative to 1/12 of the mass of a carbon-12 atom
What is the symbol for relative molecular mass?
Mr
What is the unit for relative molecular mass?
no unit
What is relative formula mass (of an ionic compound)?
The average mass of one unit of the ionic compound relative to 1/12 of the mass of a carbon-12 atom
What is the symbol for relative formula mass?
Mr
What is the unit for relative formula mass?
no unit
What is molar mass (of an element)?
The mass of one mole of atoms of the element
What is the unit for molar mass?
g/mol
The molar mass of an element is equal to its ________ in grams
relative atomic mass (Ar)
The molar mass of a molecule is equal to its ________ in grams
relative molecular mass (Mr)
The molar mass of an ionic compound is equal to its ________ in grams
relative formula mass (Mr)
Formula to calculate number of moles
Number of moles = Number of particles / 6.02 x 10^23
Number of moles = Mass (in g) / Molar mass (in g/mol)
Formula to calculate percentage composition by mass
Percentage composition by mass = (Ar of the element x Number of atoms of the element in the formula) / Mr of the compound x 100%