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Secondary V • 1yr.

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

Chemistry
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Explanations (1)

  • Explanation from Alloprof

    Explanation from Alloprof

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

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    Team Alloprof • 1yr.

    Thank you for your question!

    First, remember that a mole contains:

    $$6,023•10^{23}\:particles$$

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

    $$n=\frac{m}{M}$$

    $$n_{CO_2}=\frac{2,25}{44,095}$$

    $$n_{CO_2}≈0,0511\:moles$$

    Legend:

    • 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:


    $$n_{O}=2•n_{CO_2}=2•0,0511\:moles≈0,102\:moles$$


    Don't hesitate if you have other questions!