Question

Performing Percent Composition calculations

Answer 1

percent by mass of carbon = 27,27 %

percent by mass of oxygen = 72.72 %

Explanation:

To calculate the percent composition of carbon dioxide (CO₂) we use the following  algorithm.

Molecular mass of CO₂ =  atomic weight of carbon × number of carbon atoms + atomic weight of oxygen + number of oxigen atoms

Molecular mass of CO₂ = 12 × 1 + 16 × 2 = 44 g / mole

Considering 1 mole of CO₂ we devise the following reasoning:

If in           44 g of CO₂ we have 12 g of carbon and 32 g of oxygen

Then in    100 g of CO₂ we have X g of carbon and Y g of oxygen

X = (100 × 12) / 44 = 27,27 % carbon

Y = (100 × 32) / 44 = 72.72 % oxygen

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Answer 2

Answer:

carbon = 27,27 %

oxygen = 72.72 %

Explanation: