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16 September, 19:57

2NH4Cl (s) + Ba (OH) 2⋅8H2O (s) →2NH3 (aq) + BaCl2 (aq) + 10H2O (l) The ΔH for this reaction is 54.8 kJ. How much energy would be absorbed if 24.7 g of NH4Cl reacts?

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  1. 16 September, 23:35
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    1) Chemical equation

    2NH4Cl (s) + Ba (OH) 2⋅8H2O (s) →2NH3 (aq) + BaCl2 (aq) + 10H2O (l)

    2) Stoichiometric ratios

    2 mol NH4Cl (s) : 54.8 KJ

    3) Convert 24.7 g of NH4Cl into number of moles, using the molar mass

    molar mass of NH4Cl = 14 g/mol + 4*1 g/mol + 35.5 g/mol = 53.5 g/mol

    number of moles = mass in grams / molar mass

    number of moles = 24.7 g / 53.5 g/mol = 0.462 moles

    4) Use proportions:

    2 moles NH4Cl / 54.8 kJ = 0.462 moles / x

    => x = 0.462 moles * 54.8 kJ / 2 moles = 12.7 kJ

    Answer: 12.7 kJ
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