CHAP 7 MOLE CONCEPT & STOICHIOMETRY

Question 1

define relative atomic mass

Answer 1

is the average mass of the atom compared with 1/12 of the mass of a carbon-12 atom.

Question 2

define relative molecular mass

Answer 2

is the average mass of the molecule compared with 1/12 of the mass of carbon-12 atom

Question 3

calculate the Mr of Fe2O3
Fe: 56
O: 16

Answer 3

2(56)+3(16) = 160

Question 4

define the term mole in terms of Avogadro constant

Answer 4

one mole of substance will always contain 6.02x10^23 particles of that substance.

Question 5

Formula of the Avogadro constant

Answer 5

6.02x10^23

Question 6

what is the conversion of cm^3 to dm^3 and vice-versa

Answer 6

1cm^3 -> 0.001 dm^3 ( 1000x )
1dm^3-> 1000cm^3