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A calorimeter is set up with 100.0 mL of water in it at 22.1˙C. When 5.836 g of a salt MX is added to the water and stirred, the salt dissolves and the temperature of the solution increases to 28.4˙C

A calorimeter is set up with 100.0 mL of water in it at 22.1˙C. When 5.836 g of a salt MX is added to the water and stirred, the salt dissolves and the temperature of the solution increases to 28.4˙C. The mass used is 0.0389 moles of the salt. What is the ∆H of solution of the MX salt? 

c (solution) = 4.05 J/g.˙C

 

MX (s) -->   M+ (aq)  +  X- (aq)     ∆H = ?

 

 

a. +2.7 kJ

b. -2.7 kJ

c. -69.4 kJ

d. +69.4 kJ

e. -15.8 kJ



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