1. In determining the calorimeter constant, a student added 50.00 mL H₂O at 48.5°C to 50.00 mL H₂O at 23.2°C in a calorimeter. The temperature of the mixture was 35.4°C. Calculate the calorimeter constant given that the density of H₂O is 1.00 g/mL and the specific heat capacity of water is 4.18J/g °C.

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Chapter1: Chemical Foundations
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1. In determining the calorimeter constant, a student added 50.00 mL H₂O at 48.5°C to 50.00
mL H₂O at 23.2°C in a calorimeter. The temperature of the mixture was 35.4°C. Calculate the
calorimeter constant given that the density of H₂O is 1.00 g/mL and the specific heat capacity
of water is 4.18J/g °C.
2. A student mixed 50.00 mL of 1.00 M HCl at 20.5 °C with 50.00 mL of 1.00 M NH3 at
20.5 °C. After mixing, the temperature rose to 26.6 °C. The calorimeter constant had been
determined to be 18.0 J/°C. Assume the density and specific heat capacity of the solution are
the same as water, 1.00 g mL-¹ and 4.18 J g-¹ °C-¹, respectively.
a)
b)
Calculate the enthalpy of neutralization in kJ per mole NH3 consumed.
Is this reaction endothermic or exothermic?
Transcribed Image Text:1. In determining the calorimeter constant, a student added 50.00 mL H₂O at 48.5°C to 50.00 mL H₂O at 23.2°C in a calorimeter. The temperature of the mixture was 35.4°C. Calculate the calorimeter constant given that the density of H₂O is 1.00 g/mL and the specific heat capacity of water is 4.18J/g °C. 2. A student mixed 50.00 mL of 1.00 M HCl at 20.5 °C with 50.00 mL of 1.00 M NH3 at 20.5 °C. After mixing, the temperature rose to 26.6 °C. The calorimeter constant had been determined to be 18.0 J/°C. Assume the density and specific heat capacity of the solution are the same as water, 1.00 g mL-¹ and 4.18 J g-¹ °C-¹, respectively. a) b) Calculate the enthalpy of neutralization in kJ per mole NH3 consumed. Is this reaction endothermic or exothermic?
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