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Calculating moles, molar mass and molecular weight

The chlorophyll-a molecule, C55H72MgN4O5, is important in photosynthesis.
(a) Determine its molecular mass (in atomic mass units)
(b) What is the mass (in grams) of 3.00 moles of chlorophyll-a molecules?

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(a)

To find the molecular mass of chlorophyll, we need to know the atomic mass of each element in the molecule. They are

C - ...

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