Consider the balanced neutralization reaction below, and answer the following qu

Question

Consider the balanced neutralization reaction below, and answer the following questions:

HCl(aq) + NaOH(aq) ————> NaCl(aq) + H2O(l)

50.0 mL of 1.00 M HCl and 50.0 mL of 1.00 M NaOH, both at 22.5°C are added to a calorimeter and allowed to react and thermally equilibrate, raising the temperature of the calorimeter to 29.4°C. Assume that the total mass of water is 100.0 g. The specific heat of water = 4.184 J/g °C

How much total energy is transferred from the reactants to the water?

What is the molar heat of neutralization for the reaction in kJ/mol?

Explanation / Answer

total mass of water = 100 g

specific heat = 4.184 J / goC

temperature rise = 29.4 - 22.5 = 6.9 oC

Q = m Cp dT

    = 100 x 4.184 x 6.9

    = 2886.96 J

total energy is transferred = 2887 J

heat of neutralization = - Q / n

                                 = - 57.74 kJ/mol

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