Hi there =]

Was just wondering if anyone could help me with this question, my brain is a bit mushy as have been at this for well over a few hours....
I'm not too sure how to go about it....do i find out the RAM of each of the gases and then using the Avogadro hypothesis, work it out from that ?
As in doing that the answer will need more than 3 significant figures....so i must be doing something wrong !!

Any help with this would be super massively appreciated !! =D
Thanks peeps

moonbearx

C₃H₅ (NO₃)₃ (l) + 3H₂O (l) decomposes rapidly to produce nitrogen, carbon dioxide, water vapour, oxygen and heat energy according to Reaction 2, with an energy change known as the enthalpy of decomposition. The temperature of this reaction can exceed 5000 °C.

Reaction 2;
4C₃H₅(NO₃)₃ (l) = 12CO₂ (g) + 10H₂O(g) + 6N₂ (g) + O₂ (g) + heat

Calculate the volume occupied by the gaseous products from the complete decomposition of 4 moles of C₃H₅ (NO₃)₃ (l) + 3H₂O (l), as shown in Reaction 2, when cooled to 25 °C and at atmospheric pressure. Express your answer to three significant figures, and explain your reasoning.