system with more possible arrangements for the molecules will have a higher entr

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system with more possible arrangements for the molecules will have a higher entropy. The number of possible arrangements increases with the number of moles of gas. When a reaction produces more moles of gas than it consumes, DeltaS_rXn will be positive. This reasoning only applies to the number of moles of gas present and not to solids. Since molecules in a solid cannot freely move around with respect to each other, the number of arrangements possible in a solid is very small compared to a gas. Which reactions have an increase in the number of moles of gas present?

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system with more possible arrangements for the molecules will have a higher entr

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