Atoms, Molecules and Stoichiometry

Question 1

Define relative atomic mass

Answer 1

mass of one atom of an element relative to one-twelfth of the mass of an atom of carbon-12

Question 2

define relative isotopic mass

Answer 2

mass of an atom/isotope relative to one-twelfth of the mass of an atom of carbon-12

Question 3

define relative molecular mass

Answer 3

mass of one molecule of an element or compound relative to one-twelfth of the mass of a carbon 12 atom

Question 4

define relative formula mass

Answer 4

Sum of all the relative atomic masses of the atoms in the compound. It is used for compounds containing ions.

Question 5

define unified atomic mass

Answer 5

one twelfth of the mass of a carbon-12 atom

Question 6

define mole

Answer 6

avogadro’s number (6.02x10^23) of atoms or molecules

Question 7

formula for finding mole

Question 8

formula for finding relative atomic mass using mass spectra?

Question 9

define empirical formula

Answer 9

The simplest whole number ratio of the elements present in one molecule of a compound

Question 10

define molecular formula

Answer 10

The actual ratio of the elements present in one molecule of a compound

Question 11

formula relating to gases

Answer 11

volume = Mr x 24