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 CO2 made up of these common
isotopes has a molecular weight of ____.



a. 28
b. 44
c. 56
d. 14
e. 22


ANSWER: b

Biology & Microbiology

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