Chapter 10
(2) Note: Tritium is a diatomic molecule.
Initial activity 9.6 × 1010 Bq, 2.59 CiAfter 2.5 years 8.3 × 1010 Bq, 2.25 Ci(3) Half-lives: 0.8 h, 8.1 h
Initial activities: 7300 counts min-^1 ; 520 counts, min-^1(4) 1.10 × 105 Bq
(5) 4.04 × 106 Bq
(6) 21.4 mg
(7) 100 pmol
Chapter 11
(1) The decomposition of copper (II) sulphate when heated to 400°C is seen to occur in three stages.
Since the weight scale shows that 0.5 mg (50%) corresponds to 40 mm, then 1 mm = 1.25%
(a) Up to ≈ 100 °C, 11.5 mm ≈ 14.4%.Calculated loss 14.4%(b) From approximately 100°C to 200°C a further drop of 11.5 mm gives a further loss of 14.4%, to
a total loss of 28.8%.Calculated loss 14.4%(c) From approximately 200°C to 400°C a further drop of about 6 mm gives a further loss of about
7.5%, to a total loss of 36%.Calculated loss 7.2%