When a 5.68-g sample of gaseous hydrogen bromide dissolves in 43.0 g of water in a coffee-cup calorimeter (see above figure) the temperature rises from 20.00 oC to 49.22 oC. Calculate H in kJ/mol HBr for the solution process. HBr(g) H+(aq) + Br-(aq) The specific heat of water is 4.18 J/g-K. Hsolution = _____kJ/mol HBr.

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Collen VonLv2

3 May 2019

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In a coffee-cup calorimeter, 1 mol KOH and 1 mol HBr initiallyat 19.5 oC (Celsius) are mixed in 100g of water to yield thefollowing reaction: KOH + HBr ? K+(aq) + Br-(aq) + H2O(l) Aftermixing the temperature rises to 74.2 oC. Calculate the change inenthalpy of this reaction. Specific heat of the solution = 4.184J/(g oC) State your answer in kJ with 3 significant figures. Don'tforget to enter the unit behind the numerical answer. The molecularweight of KOH is 56.2 g/mol, and the molecular weight of HBr is80.9 g/mol.