Part C. Determine ,Ho(HOH). Reaction (111) Analysis 1. Mass solution (Clb-Cla) 2

Question

Part C. Determine ,Ho(HOH). Reaction (111) Analysis 1. Mass solution (Clb-Cla) 2. Temperature Trail 1 Trial 2 840e 80, 75g Graph the Part C temperature vs. time data on the graph paper provided and a graph as described in the about the experiment section to determine a. Ti b. T . Enthalpy of solution Use eq. (13) with m from (C1), Csp C sp, solution -1855.20 -y65,81/mol -1,758·SyJ 4H' (H7OH) per mol (C3/0.040 mol),43965J/mol (The 0.040 mol comes from experimental step C3) Mean A,Ho (H/OH) per mol (C4 in eq. (15)) -45, 209.7 J/m 45,20.7 J/mol Standard deviation (C4 and C5 in eq. (17)) 1,22J/mol

Explanation / Answer

You have made an assumption that the specific heat capacity of the solution is equal to the specific heat capacity of water. Although this is an approximation, it introduces an error into the calculation. Another major source of error is caused by heat loss to the environment. You calculate the enthalpy change by considering that the heat released is equal to the heat absorbed and ignore the loss of heat into the environment.

Experimentally, you are measuring the STANDARD change in enthalpy. However in laboratory conditions it is impossible to always maintain a temperature and pressure of 298.15K and 101kPa, which will also contribute as a source of error.

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