When 105 G KBr(s)dissolves in 125 G of Water at 24

question 5

Multiple Choice

When 10.5 g KBr(s) dissolves in 125 g of water at 24.2°C,the final temperature of the solution comes to 21.1°C.Assume that the heat capacity of the solution is roughly 4.18 J/(g . °C) .What is the molar enthalpy of solution of potassium bromide (119 g/mol) ?

• A)+19.9 kJ/mol
• B)+167 kJ/mol
• C)+1.76 kJ/mol
• D)+67.6 kJ/mol
• E)+18.4 kJ/mol

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