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18 April, 01:08

Oxygen is a diatomic gas. How many oxygen molecules are in 16 grams of oxygen?

A) 0.5 molecules

B) 1.20 x 1024 molecules

C) 3.01 x 1023 molecules

D) 6.02 x 1023 molecules

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Answers (1)
  1. 18 April, 01:37
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    3.011 * 10²³ O₂ Molecules

    Explanation:

    Data Given:

    Mass of O₂ = 16.0 g

    M. Mass of O₂ = 32.0 g. mol⁻¹

    Step 1: Calculate Moles of O₂ as,

    Moles = Mass : M. Mass

    Putting values,

    Moles = 16.0g : 32.0 g. mol⁻¹

    Moles = 0.50 mol of O₂

    Step 2: Calculate number of Carbon atoms,

    As 1 mole of any substance contains 6.022 * 10²³ particles (Avogadro's Number) then the relation for Moles and Number of Oxygen Molecules can be written as,

    Moles = Number of O₂ Molecules : 6.022 * 10²³ Molecules. mol⁻¹

    Solving for Number of C atoms,

    Number of O₂ Molecules = Moles * 6.022 * 10²³ Molecules. mol⁻¹

    Putting value of moles,

    Number of O₂ Molecules = 0.50 mol * 6.022 * 10²³ Molecules. mol⁻¹

    Number of O₂ Molecules = 3.011 * 10²³ O₂ Molecules
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