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30 June, 20:51

What is the formula mass of beryllium chloride, becl2?

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  1. 30 June, 21:20
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    To determine the formula mass of beryllium chloride, BeCl₂, we start up with the basis of one mole first.

    Basis: 1 mole BeCl₂

    To determine the molar mass of BeCl₂, we add up the mass of one mole of beryllium and two moles of chlorine.

    1 mol Be = 9 g/mol

    1 mol of Cl = 35.45 g/mol

    Solving,

    molar mass of BeCl₂ = (1 mol Be) (9 g/mol) + (2 mols Cl) (35.45 g/mol)

    molar mass of BeCl₂ = 79.9 g

    Then, we take into consideration that 1 mol is equal to 6.022 x 10²³ formula units.

    formula mass BeCl₂ = (79.9 g/mol) (1 mol/6.022 x 10²³ formula units)

    formula mass of BeCl₂ = 1.33 x 10⁻²² g/formula unit

    Answer: 1.33 x 10⁻²² g/formula unit
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