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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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