Map Sapling Learning The reaction caused the temperature of the solution to rise

Question

Map Sapling Learning The reaction caused the temperature of the solution to rise from 22.50 o to 27.00 C. If the solution has the same density and specific heat as water (1.00 g/mL and 4.184 respectively), what is AH this reaction (per mole of H20 produced)? Assume that the total volume is the sum of the individual volumes. Number AH- 1035.5 kJ mol H,O There is a hint available! view the hint by clicking on the on the divider bar again to hide the hint. O Previous 8 Give up & View solution Check Answer Ned Exit

Explanation / Answer

Ba(OH)2 + 2 HCl BaCl2 + 2 H2O
The barium hydroxide and hydrochloric acid are present in stoichiometric amounts, so either can be considered the limiting reactant:

= (0.0650 L)*(0.660 mol/L HCl)*(2 mol H2O / 2 mol HCl) = 0.0429 mol H2O

density of solution = 1 g/ml
= (4.184 J/g·°C)*(65.0 g + 65.0 g)*(27.00 - 22.50)°C = 2447.6 J gained by the solution
= (2447.6 J) / (0.0429 mol H2O) = 57053.6 J/mol H2O = 57.0536 KJ/mole

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