Discussion
Separating carbon monoxide at \( 27.9949 \) from nitrogen at \( 28.0062 \) needs a resolution of about
Answer: A
Dividing the mass by the difference to be resolved:
\[ R = \frac{28}{0.0113} \approx 2500 \]
giving about 2500, well beyond a quadrupole's unit resolution but easy for a sector or a modern time-of-flight instrument. That a difference in the third decimal place demands thousands of resolving power is why high-resolution instruments are built and maintained.
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