ACL: What to ..er Sports PT Rec time sheet Grades and Attendance 1020 100 Genera

Question

ACL: What to ..er Sports PT Rec time sheet Grades and Attendance 1020 100 General Chemistry 1-LCCC Calculate the enthalpy change for the reaction per mole of Me O00 100 General Chemistry CommunicationGrades gnment kayla Mills: Attempt 1 If 1.32 g MgO is combined with 100.0 mL of 1.00 M HCl in a coffee cup calorimeter, the temperature of the HCl solution increases from 24.2 °C to 34.4 °C. Calculate the enthalpy change for the reaction per mole of MgO. Assume that the specific heat of the HCI solution is 4.18 J/gK and its density is 1.00 g/mL and no heat is lost to surroundings MgO (s) + 2 HCl (aq) MgCl2 (aq) + H2O (n 1) -1.65 kJ 2) -132 kJ 3)-105 kJ 4) -409 kJ 5)-3.27 kJ Save

Explanation / Answer

from equation,

1 mol MgO = 2 mol HCl

no of mol of MgO = 1.32/40 = 0.033 mol

no of mol of HCl = 100*1/1000 = 0.1 mol

limiting reactant = MgO

heat released(q) = m*s*DT

m = mass of solution = 100+1.32 = 101.32 g

s = specific heat of solution = 4.184 j/g.c

DT = 34.4-24.2 = 10.2

q = 101.32*4.184*10.2

   = 4.324 kj

DHrxn = -q/n = -4.324/0.033 = -131.03 kj

answer: 2) - 132 kj

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