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Thermochemistry: Enthalpy

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Wize University Chemistry Textbook > Thermodynamics: Part 1: (0th law, 1st law, Calorimetry, Enthalpy)

Introduction to Enthalpy Calculations

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The enthalpy of combustion for ethanol C2H5OH is -1370.7 kJ/mol. Calculate q and ΔH when 45 g of ethanol are burned at 1 atm and 298 K.
  1. q (kJ)
  2. deltaH (kJ)
(Don't include units in your answer and round to the nearest whole number)
More Introduction to Enthalpy Calculations Questions:
The following reaction enthalpies are provided:
H2(g)+12O2(g)→H2O(l),ΔH1=−285.8kJ/mol(1)H_{2(g)}+\frac{1}{2}O_{2(g)}\to H_2O_{(l)},\Delta H_1=-285.8kJ/mol\hspace{70pt} (1)
C(s)+O2(g)→CO2(g),ΔH2=−293.5kJ/mol(2)C_{(s)}+O_{2(g)}\to CO_{2(g)},\Delta H_2=-293.5kJ/mol \hspace{80pt} (2)
Find ΔHo for the following reaction if 12.0 g of N2H4 is consumed in excess N2O4.
2N2H4(l)+N2O4(g)→3N2(g)+4H2O(l)2N_2H_{4(l)}+N_2O_{4(g)}\to 3N_{2(g)}+4H_2O_{(l)}
The following enthalpies of formation are provided: