Ethanol, C2H6O, is most often blended with gasoline - usually as a 10 percent mix - to create a fuel called gasohol. Ethanol is a renewable resource and ethanol-blended fuels, like gasohol, appear to burn more efficiently in combustion engines. The combustion of one mole of ethanol releases 326.7 kcal of energy. The combustion of one mole of hexane, C6H14, releases 995.0 kcal of energy. How much energy is released during the complete combustion of 380 grams of hexane ? kcal Assuming the same efficiency, would 380 grams of ethanol provide more, less, or the same amount of energy as 380 grams of hexane?

Soda ash (sodium carbonate) is widely used in the manufacture of glass.  Prior to the environmental movement much of it was produced by the following reaction.   CaCO3 + 2 NaCl → Na2CO3 + CaCl2   Unfortunately, the byproduct calcium chloride is of little use and was dumped into rivers, creating a pollution problem.  As a result of the environmental movement, all of these plants closed.  Assume that 125g of calcium carbonate (100.09 g/mol) and 125 g of sodium chloride (58.44 g/mol) are allowed to react.   Determine how many grams of useful sodium carbonate (105.99 g/mol) will be produced.  How many grams of useless calcium chloride (110.98 g/mol) will be produced?  You should also determine how many grams of excess reactants are left (indicate which one is the limiting reactant)

Acid rain is rain that has a relatively high amount of sulfuric acid in it. This sulfuric acid is generated from the combination of SO3 and water in the atmosphere. The acid rain can then erode minerals like aluminum oxide. The aqueous Al+3 is toxic to aquatic life. Balance the below equations that represent these reactions. (One is already balanced.) SO3(g) + H2O(g) → H2SO4 (g) Al2O3(s) + H2SO4 (aq) → Al+3 (aq) + SO4-2 (aq) + H2O (l)

Dimethyl ether, a useful organic solvent, is prepared in two steps. In the first step, carbon dioxide and hydrogen react to form methanol and water: CO₂(g) + 3 H₂(g) CH₂OH(1) + H₂O(1) In the second step, methanol reacts to form dimethyl ether and water: 2 CH₂OH(1)→ CH₂OCH3(g) + H₂O(1) Calculate the net change in enthalpy for the formation of one mole of dimethyl ether from carbon dioxide and hydrogen from these reactions. Round your answer to the nearest kJ. เม kJ AH=-131. kJ Ś ΔΗ= 8. kJ

3. Determine the enthalpy change (AH₂) for the final reaction below. a. CO(g) + ½ O₂(g) → CO₂(g) AH, -67.6 kcal b. N₂(g) + O₂(g) →→→ 2NO(g) AH₂ = 43.2 kcal c. CO(g) + NO(g) →→→ CO₂(g) + ¹½ N₂(g) AH₂ = ?

10 Ethylene (CH,CH,) is the starting point for a wide array of industrial chemical syntheses. For example, worldwide about 8.0 × 10º kg of polyethylene are made from ethylene each year, for use in everything from household plumbing to artificial joints. Natural sources of ethylene are entirely inadequate to meet world demand, so ethane (CH,CH,) from natural gas is "cracked" in refineries at high temperature in a kinetically complex reaction that produces ethylene gas and hydrogen gas. Suppose an engineer studying ethane cracking fills a 60.0 L reaction tank with 22.0 atm of ethane gas and raises the temperature to 500. °C. She believes K =0.050 at this temperature. Calculate the percent by mass of ethylene the engineer expects to find in the equilibrium gas mixture. Round your answer to 2 significant digits. Note for advanced students: the engineer may be mistaken about the correct value of K , and the mass percent of ethylene you calculate may not be what she actually observes. %

Ethanol, C,H,O, is most often blended with gasoline - usually as a 10 percent mix - to create a fuel called gasohol. Ethanol is a renewable resource and ethanol-blended fuels, like gasohol, appear to burn more efficiently in combustion engines. The heat of combustion of ethanol is 326.7 kcal/mol. The heat of combustion of 2-methylheptane, C3H18, is 1.306×10³ kcal/mol. How much energy is released during the complete combustion of 482 grams of 2-methylheptane ? kcal Assuming the same efficiency, would 482 grams of ethanol provide more, less, or the same amount of energy as 482 grams of 2- methylheptane v more less the same amount

Consider the reaction. heat 2 Al(s) + Fe,0,(s) Al, 0,(s) + 2 Fe(1) If 10.7 kg Al reacts with an excess of Fe, O3, how many kilograms of Al,O, will be produced? mass of Al, O, produced: kg * TOOLS x10

In chemistry, what is an example of energy that involves combustion of hydrocarbons? How is it used in our everyday life and are there policies that are helpful?

Classify each chemical reaction: NaOH(aq) + HBrO (aq) → NaBrO (aq) + H₂O(1) Ca (s) + Br₂ (1) CaBr₂ (s) reaction CH₂CH₂CH, (g) + 50₂(g) 2 CH₂ (CH₂), CH₂ (8) + 802₂ (8) 3 3CO₂ (g) + 4H₂O (g) 2 5CO₂(g) + 6H₂0(g) type of reaction (check all that apply) combination single replacement double replacement decomposition combination single replacement double replacement decomposition combination single replacement double replacement decomposition combination single replacement double replacement decomposition precipitation combustion acid-base precipitation combustion acid-base precipitation combustion acid-base precipitation combustion acid-base