When 50.00ml of 0.500MHCI(aq) at 25deg. Celsius is added to a calorimeter contai

Question

When 50.00ml of 0.500MHCI(aq) at 25deg. Celsius is added to a calorimeter containing 50 ml of 0.500M NaOH at 25.0degC. The temperature of the mixture rises to 28.2 she Celsius. Solve for the enthalpy of reaction per mole of acid. Assume the aqueous solution have the same properties of water A.-27kJ B.-54kJ C.1300kJ D.670kJ When 50.00ml of 0.500MHCI(aq) at 25deg. Celsius is added to a calorimeter containing 50 ml of 0.500M NaOH at 25.0degC. The temperature of the mixture rises to 28.2 she Celsius. Solve for the enthalpy of reaction per mole of acid. Assume the aqueous solution have the same properties of water A.-27kJ B.-54kJ C.1300kJ D.670kJ A.-27kJ B.-54kJ C.1300kJ D.670kJ

Explanation / Answer

total mass of solution = total volume of solution

                                     = 50 + 50

                                      = 100 g

moles of acid = 50 x 0.5 / 1000 = 0.025

dT = T2 - T1 = 28.2 - 25.0 = 3.2 oC

Q = m Cp dT

Q = 100 x 4.184 x 3.2 = 1339 J

Q = 1.34 kJ

enthalpy of reaction    = - Q / n

                                   = -1.34 / 0.025

                                   = -53.6 kJ

                                  = -54 kJ

answer : B ) -54 kJ

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