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30 January, 20:26

Stoichiometry (8A. S, 8B. R, 8G. S, 8H. S]:Question 4

What is the mass of 1.204 x1024 particles of Li2O?

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Answers (1)
  1. 30 January, 22:37
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    59.76 grams of Li₂O

    Explanation:

    To solve this problem we will first calculate the moles of Li₂O. One mole of given substance always contains 6.022 * 10²³ particles which can be atoms, ions, molecules or formula units. This number is also called as Avogadro's Number.

    The relation between Moles, Number of Particles and Avogadro's Number is given as,

    Number of Moles = Number of Particles : 6.022 * 10²³

    Putting values,

    Number of Moles = 1.204 * 10²⁴ Particles : 6.022 * 10²³

    Number of Moles = 2.0 Moles

    Secondly, we will convert calculated moles to mass using following relationship.

    Moles = Mass / M. Mass

    Or,

    Mass = Moles * M. Mass

    Putting values,

    Mass = 2.0 mol * 29.88 g/mol

    Mass = 59.76 grams of Li₂O
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