- #1
Reluctant Atom
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Homework Statement
(C2H4NO6, EGDN) is an explosive with perfect attributes. We fill 20% of a sealed container with an EGDN. Assume that EGDN explodes and the created gas bahaves according to ideal gas law. What is the excess pressure in the sealed container?
My problem: I don't know where to utilize the fact that only 20% of the container has been filled with the explosives.
Known data
ρ = 1.49 g/cm3
T = 1006 °C
maximum pressure of a container: 395 Bar
M(EGDN) = 152 g/mol
RSpecific = 8.314 J / K . mol
Homework Equations
pV = nRT
n = m/M
ρ = m/V
The Attempt at a Solution
pV = nRT / substitute n = m/M
pV = m . R/M . T / get V to the right side
p = m/V . R/M . T / substitute ρ = m/V
p = ρ . R/M . T
ρ = 1.49 g/cm3 = 1490 kg/m3
R = 8.314 J / K . mol = 8.314 kg m2 / (s2 . K . mol)
M = 152 g/mol = 0.152 kg/mol
T = 1006 °C = 1 279.15 K
p = 104 249 546.8 kg / (m . s2) = Pa
p = 1042.495468 Bar
1042.495468 Bar - 395 Bar = 647,495468 Bar
I don't know where to apply the information that only 20% of the container has been filled with EGDN.