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Thermochemistry 3 1. A) Calculate H (express in both kcal and kJ) for the following reaction based on the thermochemical information given: N2H4(l) + 2 H2O2(l) N2(g) + 4 H2O(l) The following information is available: 2. N2H4(l) + O2(g) N2(g) + 2 H2O(l) Hrxn = –148.7 kcal H2(g) + ½ O2(g) H2O(l) Hrxn = –68.3 kcal H2(g) + O2(g) H2O2(l) Hrxn = –44.8 kcal Write the reaction for which the reaction enthalpy is equal to the standard heat of formation for C 5H8O3(l). 3. A) What quantity of heat is released when 1.00 g of sodium metal reacts with excess water? 2 Na(s) + 2 H2O(l) 2 NaOH(aq) + H2(g) B) What further quantity of heat is released when the hydrogen gas produced burns with O 2 in the air to form water (in the vapor state)? 4. Consider the reaction: 2 PH3(g) + 3 Cl2(g) 2 PCl3(g) + 3 H2(g) Note: Value for the heat of formation of PH3(g) is not given in textbook: All other required Hf are available in the text. A) Calculate H for this reaction. B) Calculate the heat absorbed or released when 22.0 g of PH 3 reacts. PH3(g) Hf = 22.89 kJ/mol