Answer :
The correct answer is due to law of constant composition both the sample of potassium chloride from chile and poland have same composition throughout the earth.
"All pure samples of the same chemical compound contain the fixed proportion of the elements by mass," according to the law of constant composition. Taking into account the pure KCl obtained from various sites, their samples will be in the fixed proportion when evaluated, regardless of the method employed to make them or geography. No matter where it comes from or how it was made, a specific chemical compound will always include all of its constituent elements in a fixed proportion (by mass). A pure compound will always have the same number of the same elements in the fixed proportion.
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