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aMI5ILL: THERMOCHEMİSTRY 13 Name Date Score Pre-laboratory Assignment THE SIGNIFICANT FOR FULL CREDIT, SHOW DETAILED CALCULATION SETUPS REMEMBER TO FOLLOW CONVENTION, AND TO SHOW MEASUREMENT UNITS FOR EACH QUANTITY 1. Give brief definitions for these terms a) enthalpy change b) standard molar enthalpy of formation (AHA c) specific heat d) heat capacity 2. Underline the correct choice: If'a reaction carried out in a calorimeter absorbs heat, the calorimeter and its contents will b) If the calorimeter and its contents increased in temperature, the reaction must have (increase, decrease) in temperature. (absorbed, released) heat. 3. A student mixed 50.0 mL of HC(ag) and 75.0 mL of NaOH(aq) in a calorimeter. Each of the reactant solutions had a density of 1.04 g/mL and an initial temperature of 22.6°C. After they reacted, the mixed solution reached a maximum temperature of 26.3°C. If the product solution has a specific heat of 4.0 J/g C, calculate the heat released or absorbed by the reaction process. REV 2018-05-23 CHM151 THERMOCHEMISTRY

Answer 1

The amount of heat released or absorbed can be calculated using the formula:

Q = m * c * ΔT

where Q = Amount of heat released or absorbed

m = mass of the resulting solution

c = specific heat capacity of the liquid

ΔT = Difference in temperatures

The solution for the above given problem is shown in the image below:

600 +15 a mi 125.o m Mass Den un ,''Mass-130
   
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