hmm, i not sure i come back later with the answer.
The sign of ΔSsys for a solid explosive converts to a gas is positive.
The term used for the measurement of randomness and disorderliness in a system is known as Entropy (S). ΔS calculates the change in entropy and it is positive when entropy increase and negative when entropy decreases.
Entropy increases when heat is added to the system. Addition of heat increases the randomness of the molecules and hence the entropy increases.
When a solid explosive converts to a gas the randomness increases. Explosive causes heat and the solid is converted into gas. The randomness of molecules is maximum in gases thus the entropy increases. The sign of ΔS is positive for this process.
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It depends on the nature of the reaction. if the reaction favors high pressure then the reaction will produce more products to reestablish the equilibrium. then if the the chemical reaction favors low pressure then when increasing the pressure the chemical reaction will produce more of the reactants to reestablish equilibrium.
