work. 1. A considerable amount of heat is required for the decomposition of aluminum oxide. 2A1,O, (s) ----------à 4Al(s) + 30,(g) Delta H= 3352 kJ a. What is the enthalpy change for the formation of 1 mole of aluminum oxide from its elements? b. Is the reaction endothermic or exothermic?

113 kJ of heat is absorbed when one mole of carbon reacts with one mole of water. Energy + C + H2O → CO + H2 According to the reaction above it can be concluded that the reaction is ​  a endothermic, because the change of enthalpy was negative  b exothermic, because the change of enthalpy was negative  c exothermic, because the change of enthalpy was positive  d endothermic, because the change of enthalpy was positive

D. All of the statements are false. 2NO + 0₂ → NO, A, H° = 90.25 kJ/mol NO₂, AH° = 33.18 kJ/mol → 2NO₂ For numbers 3-4: Consider the data given. 3. What is the value of the standard enthalpy of reaction (kJ/mol)? A. 57.07 C. 114.14 B. -57.07 D. -114.14 4. What is the value of the standard enthalpy of reaction (kJ/mol) of the decomposition of NO2? A. 57.07 C. 114.14 D. -114.14 B. -57.07

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2. a. Determine the standard heat of formation, AH for the following reaction using the Data from the Table. C3H12 ) + 802(g) → 5CO2 + 6H₂O b. State whether the reaction is exothermic or endothermic. Explain. c. Rewrite the equation as thermochemical equations in two different ways to include the heat calculated in (2a). d. Draw a detail Energy Diagram representing the thermochemical equation in Ⓒ illustrating the the reactants and products and their positions.

The overall reaction in commercial heat packs can be represented as 4Fe(s) + 302(g) →2Fe₂O3 (8) AH = -1652 kJ a. How much heat is released when 2.20 mol iron is reacted with excess O₂? kl released b. How much heat is released when 1.83 mol Fe2O3 is produced? kJ released c. How much heat is released when 2.20 g iron is reacted with excess O₂? kJ released d. How much heat is released when 11.8 g Fe and 2.61 g O2 are reacted? Submit Answer [Review Topics] kl released Retry Entire Group [References] 8 more group attempts remaining

An 87.9 g sample of chromium metal at 99.1°C is placed in a calorimeter containing 100.00 g of water at 21.0°C The contents of the calorimeter come to a temperature of 25.7°C. The heat capacity of water is 4.18 J/(g* °C) a. Is this process exothermic or endothermic? b. Calculate the amount of heat released by the metal (q metal) in Joules. Show your work.

Please help with question 2!