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One element consists of a mixture of three isotopes, with the two lighter isotopes having the same frequencies. The molar masses of the three isotopes are also known.
Calculate the general formula for the average molar mass of the element.
Solution: - Isotope frequency I: x where x would be a number between 0 (0%) and 1 (100%)
- Frequency of isotope II: x
- So isotope III has the frequency (1-2x)
- To expected molar mass: x·M(Isotop I) + x·M(Isotop II) + (1-2x)·M(Isotop III)
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