The Most Common Isotope of Carbon Has an Atomic Number

question 72

Multiple Choice

The most common isotope of carbon has an atomic number of 6 and a mass number of 12, while the most common isotope of oxygen has an atomic number of 8 and a mass number of 16. A molecule of CO₂made up of these common isotopes has a molecular weight of ____.

• A) 28
• B) 44
• C) 56
• D) 14
• E) 22

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