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(g) → 2 NH3(g) AH=-92. kJ In the second step, ammonia and oxygen react to form nitric acid and water: NH3(g) + 2O₂(g) → HNO₂(g) + H₂O(g) ΔΗ= -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.

1) When HCl(aq) and NaOH(aq) are mixed in a beaker, the beaker feels warm to the touch. What is known about the enthalpy of this reaction? The reaction is exothermic. ΔH is positive. The reaction is endothermic. Heat is absorbed from the surroundings. 2) Consider this combination reaction:2Mg(s)+O2(g)→2MgO(s) ΔH=−1204 kJ What is the enthalpy for the decomposition of 1 mole of MgO(s) into Mg(s) and O2(g)? -602 kJ/mol 602 kJ/mol -1204 kJ/mol 1204 kJ/mol 3) The enthalpy for the formation of 1 mole of NH3(aq) is -80.29 kJ/mol. What is the enthapy for the formation of 3 moles of NH3(aq)? -240.87 kJ −518×103 kJ -26.76 kJ -83.29 kJ

Given the reaction: 4 Fe(s) + 3O2(g) → 2 Fe203(s) A H= -1652 kJ, what is the enthalpy change when 2.00 moles of Fe203 are produced? O 1652 kJ O - 1652 kJ O 826 kJ O - 826 kJ

The following thermochemical equation is for the reaction of carbon monoxide(g) with oxygen(g) to form carbon dioxide(g). 2CO(g) + O2(g)- →2CO2(g) AH=-566 kJ How many grams of CO(g) would have to react to produce 104 kJ of energy? grams

In the following reaction, how much heat is generated when 3.21 moles of CH4 are burned? CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O(g) AH° = -802 kJ/mol

In a popular television series, the two characters use thermite to assist with breaking into a chemical storage facility because the reaction between aluminum and iron(III) oxide produces a tremendous amount of heat. If they began with 10.0 g of Al, how many kJ of heat would be released? 29. 2 Al(s) + Fe,O3(s) → Al,O;(s) + 2 Fe(s) AH = -852 kJ 158 kJ A) B) 236 kJ 472 kJ D) None of the above

The heat of reaction for the combustion of benzene (C6H6) is –3909.9 kJ. 2 C6H6 15 O2 → 12 CO2 + 6 H20 What would be the heat change when 161.54 g of benzene is burned in kilojoules?

How much heat is produced when 57.4 g of NO2 react?    4NO2(g) + O2(g) →  2N2O5(g)      heat of reaction = –110.2 kJ

4. When 1.00 L of 1.05 M Ba(NO3)2 solution is mixed with 1.00 L of 1.10 M NazSO4 solution at 25.0°C in a coffee-cup calorimeter. The reaction is Ba(NOs)2(aq) + NazSO4(aq) → BaSO4(s) + 2NANO:(aq). The final temperature of the mixture increases to 28.1°C. Calculate the enthalpy change per mole for this process. (Assuming C=4.18 J °C' g' and density of the final solution is 1.05 g/ml).

What is the enthalpy change when 47.6 g Al completely react, given the reaction below?   The molar mass of Al = 27.0 g/mol.  Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe(s)        ΔH°rxn = -852 kJ