Mass of Mg Mass of MgO Mass of empty calorimeter Mass of calorimeter and soln. a
ID: 511292 • Letter: M
Question
Mass of Mg Mass of MgO Mass of empty calorimeter Mass of calorimeter and soln. after reaction Total mass of solution Initial Temperature Final Temperature (from graph) Delta T Moles of Mg Moles of MgO q (heat evolved by reaction) Delta H (in kJ/mol) Delta H_1 = Average value of Delta H for all runs using Mg = Delta H_2 = Average value of Delta H for all runs using MgO = Delta H degree f(MgO, s) = Percentage error in Delta H degree _f(MgO, s) from accepted value = Include in your report, on a separate sheet, one sample calculation of each quantity marked with an asteriskExplanation / Answer
moles = mass/molar mass
heat evolved q = mCpdT
m = mass
Cp = specific heat
dT = change in temperature
Mg run 1 Mg run 2 MgO run 1 MgO run 2
moles Mg 0.0027 0.0029
moles MgO 0.0040 0.0041
q (J) 6.18 6.37 5.77 7.28
dH (kJ/mol) 2.29 2.20 1.44 1.77
dH average for Mg runs = 2.245 kJ/mol
dH average for MgO runs = 1.605
dHo (MgO) = -0.64 kJ/mol
Large difference between the literature value and the calculated value is seen in this case.