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Horace Hill ∙
The usable energy released or absorbed by a reaction.
Out of the air. There is a lot of carbon dioxide in the air. You exhale carbon dioxide, because your cells use oxygen and turn it into carbon dioxide.
An increase in entropy.
The crystalline structure of the solid most determine the entropy of a solid.
Reactions that increase the moles of gas will increase in entropy.
The reaction is exothermic.
H = 28 kJ/mol, S = 0.109 kJ/(molK)
G = 0 kJ/mol
Thermodynamics
Entropy tends to increase in a system.
The potential energy of the reactants is greater than the potential energy of the products.
Payload weight
Only one requires air molecules to generate lift.
Chemical rocket
It is not spontaneous.
Not B
to simplify the design of the rocket.