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Secondary V • 2yr.

How do I answer this question: how many moles of oxygen are there in 2.25 g of CO2? Thank you!


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Explanations (1)

  • Explanation from Alloprof

    Explanation from Alloprof

    This Explanation was submitted by a member of the Alloprof team.

    Team Alloprof • 2yr.

    Thank you for your question!

    First, remember that a mole contains:


    To solve the problem, you must first convert 2.25 g of CO2 in moles. The molar mass of CO2 is 44.095 g.





    • n: number of moles

    • m: mass of the substance

    • M: molar mass of the substance

    Subsequently, it must be considered that in one mole of CO2 there are two moles of O. Thus:


    Don't hesitate if you have other questions!

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