In a mixture of non-reacting gases, the total pressure of the mixture is equal to the sum of the partial pressures of each of the individual gases in the mixture. This is also known as .

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sulfur belongs to group 16 because it can be found in nature whether it is in a free or combined state.

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alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".