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What is the difference in molecular weight and atomic weight?

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Relevant answers:

Is the molecular weight the same as its atomic weight?
The molecular weight is the sum of the atomic weights of all the atoms contained in the molecule.
Why are atomic weights relative weights?
Both have a basis of carbon-12
What is the difference betweem molecular weight in amu and molecular weight in grams?
The only difference is the name of the unit; the numerical values are the same. However, the value in amu is the mass of a single molecule, while the molecular weight in grams is the mass of...
What is the difference between atomic weight and atomic mass and molar mass and molecular weight?
The atomic mass is the mass of an atom at rest. This refers to one atom, and is typically measured in so-called atomic mass units, and describes a single isotope of that element. The...
What is the difference between atomic number and atomic mass weight?
Atomic number is the amount of protons in the element.. For ex: Carbon has 6 protons so its atomic number is 6.. While atomic mass is the combination of not just the protons, but also the neutrons....