Instructor Name Student Name: POST-LAB (EXP #8): 1. Barney ate at the building 1

Question

Instructor Name Student Name: POST-LAB (EXP #8): 1. Barney ate at the building 10 sandwich shop and is not feeling himself, which causes him to not carefully follow the experimental procedure in part 2. How would the following deviations in procedure affect the experimental value for the enthalpy of solution? Would it the value to be erroneously high, erroneously low, or have no effect? Explain. a. H le waits too long to measure the final temperature of the solution after it has peaked. b. His Styrofoam cup unknowingly contains a few milliliters of water before he adds the 50 mL of water, making his total volume significantly higher

Explanation / Answer

a)

final temperature will become in equilbirium with the atmospheric temperature, i.e. approx 25°C

if this is exothermic --> dT will be lower, since Tfinal is lower, therefore Enthalpy will be lower sinc e it is directly proportional

if this is endothermic --> dT will be lower, in absolute value, i.e. the enthalpy is lower

b)

total V increases, so total mass increases, dT will be lower, therefore, Q is lower

Enthalpy change is lower therefore

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