mole concept

Question 1

relative ISOTOPIC mass, Ar of an ISOTOPE

Answer 1

the mass of an Atom Of The Isotope compared to 1/12 the mass of a 12C

Question 2

relative ATOMIC mass, Ar, of an ELEMENT

Answer 2

is the weighted average mass of the ISOTOPEs of the element compared to 1/12 the mass of a 12C atom

Question 3

relative MOLECULAR mass, Mr, of an element or compound

Answer 3

weighted average mass of a MOLECULE of the element or compound compared to 1/12 the mass of a 12C atom

** Mr has no units since it’s a ratio but has the same numerical value as molar mass

Question 4

relative FORMULA mass, Mr, of a compound

Answer 4

the weighted average mass of a FORMULA UNIT OF THE COMPOUND compared to 1/12 the mass of a 12C atom

Question 5

a mole

Answer 5

contains exactly 6.02 x 10^23 particles elementary entities

Question 6

empirical formula

Answer 6

simplest formula that shows relative number of atoms of each element present in a compound

Question 7

molecular formula

Answer 7

shows actual number of atoms of each element present in one molecule of a compound