1. The problem statement, all variables and given/known data (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 2. Relevant equations pV = nRT n = m/M ρ = m/V 3. 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.