Without doing any calculations, determine the sign of %u0394 S s y s and %u0394

ID: 783897 • Letter: W

Question

Without doing any calculations, determine the sign of %u0394Ssys and %u0394Ssurr for this chemical reaction.

CO2(g)%u2192C(s)+O2(g)%u0394H%u2218rxn= +393.5

If you could explain that would be great!

Also, why does a gas have greater entropy than the corresponding solid?

c) Particles in a solid move slower than in a gas.

d) A gas expands to fill its container, while a solid maintains a constant shape.

I think the answer is C but I'm not sure....

a) There are more available types of kinetic energy in a gas. In a solid, the molecules can only vibrate.

reaction has gas reactant having more atoms (CO2) compared to gas product (O2) hence entropy of reactant is more

hence delta S of reaction = -ve

2) a

since enetropy is measure of number of ways a system can be arranged hence more available types of kinetic energy

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