Oxygen balance

Question 1

oxygen balance formula

Answer 1

omega = ([d-2a-b/2] x 16) / Mr of explosive to nearest whole no. x 100
CaHbNcOd

Question 2

Kistakiakowsky - wilson rules

Answer 2

predict products when OB is between 0 and -40%
1. C atoms to form CO
2. H atoms to form H2O
3. CO molecules to form CO2
4. N to form N2

detonation reactions only

Question 3

heat of detonation (Q)

Answer 3

use provided enthalpy formation values
delta dH = sum of products - sum of reactants
- x 1000/Mr => to get it in KJ/Kg

Question 4

volume of detonation (V)

Answer 4

V = moles of gas produced x 22.4 L/mol
- x1000/ Mr => to get it in L/kg

Question 5

Explosive power

Answer 5

Q(magnitude only = no minus sign) x V
answer in 10^5 - 10^6 range

Question 6

modified K-W rules

Answer 6

when OB = more negative than -40% (avoids production of H2)
1. H to form H2
2. C to form CO
3. C to form solid C if remaining
4. N form N2