Calorimetry - Measuring Heat! REPORT SHEET: Experiment 10 Calorimetry- Measuring

Question

Calorimetry - Measuring Heat!

REPORT SHEET: Experiment 10 Calorimetry- Measuring Heat Part I: Measuring the Enthalpy of Solution Salt from Column A: NH Mass of salt: (0, 2924 Mass of water: o0 Salt from Column B: Ce Mass of salt: 7,0%b Mass of water: 00g NO 8 100-10,7929-110,2 Mass of solution, m =?0- /oo.L 7.0% o Mass of solution, m = a ? , o2 2 AT AT SH- SH Calculation of Observed ??,oin' Calculation of Observed A,01' Observed ??soln- Observed AHsoln Calculation of AHsoln per mole: Calculation of AHsoln per mole: AHoln per mole - AHsoln per mole =

Explanation / Answer

we have the formula Q = m * s * dT

Q = dH of the solution

m = mass of the solution

s = specific heat of the solvent

dT = change in temperature

for salt NH4NO3,

Q = dH sol = (100+10.2929)*(4.184)*(13-21)

Q = -3691.724 J per 10.2929 g of solute

molar mass of NH4NO3 = 80 g/mol

for 10.2929 g of solute dHso = -3691.724 J

for 80 g of solute = -3691.724/10.2929*80

dH sol = -28.694 kJ/mol

we have the formula Q = m * s * dT

Q = dH of the solution

m = mass of the solution (CaCl2 + H2O)

s = specific heat of the solvent

dT = change in temperature

for salt CaCl2,

Q = dH sol = (100+7.098)*(4.184)*(30-21)

Q = 4032.88 J per 7.098 g of solute

molar mass of CaCl2 = 111 g/mol

for 7.098 g of solute dH sol = 4032.88 J

for 111 g of solute = 4032.88/7.098*111

dH sol = 63.067 kJ/mol

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