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24 August, 12:32

At STP between 4.0 g of helium and 44.0 g of carbon dioxide

Borne helium and carbon dioxide will have the same number of molecules

Helium will have more molecules than carbon dioxide

Carbon dioxide will have more molecules than helium

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  1. 24 August, 14:23
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    Both helium and carbon dioxide will have the same number of molecules

    Explanation:

    Step 1:

    Data obtained from the question.

    Mass of He = 4g

    Mass of CO2 = 44g

    Step 2:

    Determination of the number of mole of He and CO2. This is illustrated below:

    For He:

    Molar Mass of He = 4g/mol

    Mass of He = 4g

    Number of mole = Mass/Molar Mass

    Number of mole of He = 4/4

    Number of mole of He = 1 mole

    For CO2:

    Molar Mass of CO2 = 12 + (2x16) = 12 + 32 = 44g/mol

    Mass of CO2 = 44g

    Number of mole = Mass/Molar Mass

    Number of mole of CO2 = 44/44

    Number of mole of CO2 = 1 mole

    Step 3:

    Determination of the number of molecules.

    From Avogadro's hypothesis, 1mole of any substance contains 6.02x10^23 molecules.

    This means that 1 mole of He will contain 6.02x10^23 molecules and 1 mole of CO2 will also contain 6.02x10^23 molecules.

    Therefore, both 4g of He and 44g of CO2 contains the same number of molecules i. e 6.02x10^23 molecules
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