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   Any pure chemical substance (compound) formed by the same elements will be formed by combining them same proportions by mass.

  Pure Water H2O  will always be formed with 2 grams of hydrogen to 16 grams of oxygen. that i s  H : O = 1 : 8..always.

same way sodium chloride will always contain  23 : 35.5 of  Sodium : chlorine, no matter how the compound is formed through any process.
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