题目
题目

CHEM 110 Section 3 (PM) SP25 Pre-Lecture Quiz 42 C16-2-3

简答题

Consider a substance with a heat of solution (Δ Hsoln) of –16.7 kJ/mol. 2.0 mol of this substance was dissolved in water in a calorimeter to create a solution with a total mass of 2 kg. If the contents of the calorimeter were initially at 20 °C, what will the final temperature in °C be? Assume that the contents of the calorimeter have a specific heat capacity of 4.18 J/(g·K). Hint: before you do the calculation, decide if the temperature will increase or decrease based on the information given. Enter your answer using 3 sig. figures and do not enter units.

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标准答案
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思路分析
Begin by identifying the sign of heat flow. The given ΔHsoln is –16.7 kJ/mol, which means the dissolution process releases heat to the surroundings (the solution). In a calorimetry setup, the heat released by dissolution is absorbed by the solvent, causing......Login to view full explanation

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