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Molar Enthalpy Lab - SCH4U101Gianfelice MariaHoang Acid(1...

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Molar Enthalpy of a Chemical Change Lab SCH4U1-01 Gianfelice Maria Hoang  Observation Table A.  NaOH (aq)  +  ½ H 2 SO 4(aq)     H 2 O (l)   +   ½  Na 2 SO 4(aq)   + heat 1.0 mol/L n H2S04  = 0.025 mol V = 50 mL [] = n/V     = 0.05 L V = 0.025 mol/L/ 0.025 L  [ ]= n/V    = 0.025 L   n = (1.0 mol/L)(0.05 L)    = 25 mL      = 0.05 mol Actual = 30mL = 5mL (XS)  Because there is 5 mL excess of acid in actuality,  which means the base is the limiting reagent.  0.05  =     x    1         0.5 X = 0.025 mol B. Acid (1) Base (1) Acid (2) Base(2) Temperature  before ( 0 C) 19.7 21.2 21.2 21.1 Temperature  after ( 0 C) 30.7 30.7 30.1 30.1
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Molar Enthalpy of a Chemical Change Lab SCH4U1-01 Gianfelice Maria Hoang i. Mass acid  = 30 g  Mass base  = 50 g ii. Temp Acid = 30.4  0 C – 20.5  0 C = 9.9  0 C     Temp Base = 30.4  0 C – 21.2 =9.2  0 C iii. q acid = mc T   = 80 g x 4.18 J/g*  0 C  x  9.9  0 C     = 3310.56/1000    =3.3 kJ q base = mc
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