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21 November, 11:51

Given the equation Si (s) + 2Cl2 (g) → SiCl2 (g) ? SiCl2 (l) + 687 kJ, how much heat is produced when 106 g of Cl2 react?

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  1. 21 November, 14:17
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    No of moles of Cl2 = mass of Cl2 / molar mass of Cl2

    = 106g / (35.4*2) g/mol

    = 106g / 70.9 g/mol = 1.495 moles

    the heat produced = no of moles of Cl2 * ΔHrxn/2mol Cl2

    when we have ΔHrxn from the equation = + 687 KJ so,

    by substitution:

    = 1.495 mol * 687 KJ/2 mol Cl2

    = 513.5 KJ
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