Antimony has two isotopes. One, amounting to 57.3% of the
Chapter 7, Problem 7.1.124(choose chapter or problem)
Antimony has two isotopes. One, amounting to 57.3% of the atoms, has a mass of 120.9. The other, 42.7% of the atoms, has a mass of 122.9.What is the average atomic mass of antimony? In 1800 two English chemists, Nicholson and Carlisle, discovered that when an electric current is passed through water, hydrogen and oxygen were produced in a 2:1 volume ratio and a 1:8 mass ratio.This evidence helped to support John Daltons theory that matter consisted of atoms, demonstrating that water consists of the two elements in a constant proportion. If the same number of moles of each gas occupy the same volume, then each molecule of water must consist of twice as much hydrogen as oxygen, even though the mass of hydrogen is only oneeighth that of oxygen.
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