When 4 miles of NH3 (g) react with O2 to form NO(g) and H2O(g) according to the following equation, 905 kJ of energy are evolved.  4NH3(g)+5O2(g)--->4NO(g)+6H2O(g) is this reaction endothermic or exothermic?  what is the value of q?____kJ

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A 38.3 g sample of a metal is heated to 86.3 °C and placed into coffee cup calorimeter containing 155 g of water initially at 25.0 °C. After the temperature of the water and the metal stop changing, both are found to have a final temperature of 26.6 °C. What is the specific heat of the metal in J/(g.°C)? The specific heat of water is 4.18 J/(g.°C). Gm = J/(g-°C)

The combustion of butane produces heat according to the equation2C4H10(g) + 13O2(g) --> 8CO2(g) + 10H2O(l)               ΔH  = -5,314.0 kJ   What is the change in heat if 19.53 g C4H10 (58.12g/mol) reacts?(Answer should have one place after the decimal. Watch the sign)

A mercury mirror forms inside a test tube by the thermal decomposition of mercury(II) oxide. 2 HgO(s) 2 Hg(l) + O2(g) Hrxn = 181.6 kJ  How much heat is needed to decompose 546 g of the oxide?kJIf 279 kJ of heat is absorbed, how many grams of mercury form?(g)

Nitric oxide (NO) can be formed from nitrogen, hydrogen and oxygen in two steps. In the first step, nitrogen and hydrogen react to form ammonia: N₂(g) + 3 H₂(g) 2NH,(9) In the second step, ammonia and oxygen react to form nitric oxide and water: 4NH3(g) + 5O₂(g) 4 NO(g) + 6H₂O(g) ΔΗ=-905. kJ Calculate the net change in enthalpy for the formation of one mole of nitric oxide from nitrogen, hydrogen and oxygen from these reactions. Round your answer to the nearest kJ. kJ ΔΗ= -92. kJ X

The following thermochemical equation is for the reaction of iron(III) oxide(s) with hydrogen(g) to form Fe3O4 and water(g). 3FE2O3(s) + H2(g)→2F¢3O4(s) + H2O(g) AH=-6.00 kJ When 34.5 grams of iron(II) oxide(s) react with excess hydrogen(g), kJ of energy are Hint: An amount of energy is expressed as a positive number. The sign of AH in the thermochemical equation indicates whether the energy is absorbed or evolved.

The reaction for the combustion of propane is   C3H8(g)+5O2(g)⟶3CO2(g)+4H2O(l)         Δ?=−526.3kcalmol   How much heat is released when 58.8g of propane is burned?   Heat: ____ kcal

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. In the first step, nitrogen and hydrogen react to form ammonia: N2(g) + 3H2(9) - 2 NH3(g) AH=-92. kJ In the second step, ammonia and oxygen react to form nitric acid and water: NH3(9)+202(9) HNO3(g) + H2O(g) AH -330. kJ Calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. Round your answer to the nearest kJ. 10k X 5

Coffee cup calorimetry was used to determine the enthalpy of solution of lithium iodide (LiI): A) First, the coffee cup was calibrated. 50.0 mL of water (s=4.184J/g×0 C) was heated to 95.50C and mixed with 50.0 mL of  cool water at 22.30 C. The temperature of the contents of the coffee cup stabilized at 49.40 C. Determine the heat capacity of the coffee cup. B) Next, the enthalpy of solution of lithium iodide (LiI) was determined. 0.0g of solid lithium iodide was added to 100mL of water at 23.20 C in the coffee cup, and the temperature increased to 32.10 C. Calculate the enthalpy of the solution of lithium iodide.