Mole - Gram Conversions

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Problem

Determine the number of moles of CO₂ in 454 grams.

Solution

First, look up the atomic masses for carbon and oxygen from the Periodic Table. The atomic mass of C is 12.01 and the atomic mass of O is 16.00. The formula mass of CO₂ is:

12.01 + 2(16.00) = 44.01

Thus, one mole of CO₂ weights 44.01 grams. This relation provides a conversion factor to go from grams to moles. Using the factor 1 mol/44.01 g:

moles CO₂ = 454 g x 1 mol/44.01 g = 10.3 moles

Answer

10.3 moles CO₂

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