Carbon Has Two Naturally Occurring Isotopes, Carbon-12 and Carbon-13

question 8

Multiple Choice

Carbon has two naturally occurring isotopes, carbon-12 and carbon-13. The more common isotope of carbon is carbon-12 with an abundance of 98.93% while carbon-13 has an atomic mass of 13.00335 u. Calculate the atomic mass of carbon-12 if the atomic mass of carbon is 12.0107 u.

• A) 13.1 u
• B) 13.0 u
• C) 12.0 u
• D) 12.8 u
• E) 12.4 u