Which isotope of carbon is found most in nature?
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Why is the carbon-13 isotope used for carbon NMR?
A. It is the only isotope of carbon that is found in living tissue.
B. Other isotopes of carbon are radioactive and not useful for precise measurements.
C. Other isotopes of carbon are much more difficult to detect in an NMR machine.
D. Carbon-13 is radioactive and can be easily detected with a scintillation counter.
Two isotopes of lithium can be found in nature. Approximately, comprise of the lithium element. If the average atomic mass of lithium is , what is the mass of the second isotope of lithium ()?
C12, the most common isotope of carbon has an atomic mass of 12daltons. 1 mole of carbon in naturally occurring coal, however,weighs a bit more than 12 grams. Why?