Treaction qcalorimeter AK|reaction = qreaction/mollimiting reagent equation 5-1

Question

Treaction qcalorimeter AK|reaction = qreaction/mollimiting reagent equation 5-1 equation 5 - 2 As discussed in the previous lab, AHcalkorimeter can be calculated as qcalorimeter mwater X Swater x ATwater equation 5 -3 2. A 25.0 mL aliquot of 1.02 M HCl was mixed in a calorimeter with a 18 Na0Hoa). The specific heat s for the resulting solution is 4.01 J/g.°C. The density of the solution is 1.03 g/mL. During the reaction the temperature of the solution increased from 23.55 to 29.41 °C a. From the sum of the volumes of hydrochloric acid and aqueous sodium hydroxide, and the density of the solution, calculate the mass of the solution. 0 mL aliquot of 1.01 M b. Use equation 5-3 to calculate qakrimeter c. Use the concentration and volume of the NaOH solution to calculate the number of moles of NaOH used in the reaction. d. Use equations 5-1 and 5-2 to calculate Hneutralization in kJ/mol from qcalorimeter

Explanation / Answer

a.

mass of solution

total V= 25+18 = 43 mL

M = D*V = 1.03*43 = 44.29 g of solutino

b)

use Qcal

Qcal = mwater * Cpwater *dT

Qcal = 44.29*4.01*(29.41-23.55)

Qcal = 1040.752 J

c,

mol of NaOH = MV =1.01 * 18*10^-3 = 0.01818

d.

HRxn = -Q/n = -1040.752 /0.01818

HRxn = -57247.08 J/mol

HRxn = -57.25 kJ/mol

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