Chlorine atoms cause chain reactions in the stratosphere that destroy ozone that protects the Earth's surface from ultraviolet radiation. The chlorine atoms come from chlorofluorocarbons, compounds that contain carbon, fluorine, and chlorine, which were used for many years as refrigerants. One of these compounds is Freon-12, CF2CI2. If a sample contains 1.0 × 10-° g of CI, how many grams of F should be present if all of the Fand Cl atoms in the sample came from CF2Cl2 molecules? i x 10 grams F

Visited Hydrocarbons, compounds containing only carbon and hydrogen, are important in fuels. The heat of combustion of cyclopropane, C3H6, is 499.8 kcal/mol. Write a balanced equation for the complete combustion of cyclopropane. + How much energy is released during the complete combustion of 444 grams of cyclopropane ? kcal

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 Cl2+F2=CLF3 (ΔH°f = -164.65 kJ/mol) . If 42 g of F2 is combined with 142 g of Cl2, how much grams of ClF3 can be produced? How much of the reagent is left over? What is the enthalpy change?

Under certain circumstances, carbon dioxide, CO2(g)CO2(g), can be made to react with hydrogen gas, H2(g)H2(g), to produce methane, CH4(g)CH4(g), and water vapor, H2O(g)H2O(g): CO2(g)+4H2(g)→CH4(g)+2H2O(g) How many moles of methane are produced when 25.1 molesmoles of carbon dioxide gas react with excess hydrogen gas? Express your answer with the appropriate units. For example, write the unit moles as mol.   How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 88.1 molesmoles of water vapor? Express your answer with the appropriate units. For example, write the unit moles as mol.

Acrylonitrile is an important building block for synthetic fibers and plastics. Over 1.4 billion kilograms of acrylonitrile are produced in the United States each year. The compound is synthesized from propene (C3H6) in the following reaction: 2C3H6(g) + 2NH3(g) + 30₂(g) →2C3H3N(I) + 6H₂O(g) Determine how many kg of acrylonitrile can be prepared from 1480 kg of propene, 788 kg of ammonia, and 1980 kg of oxygen.

The human body burns glucose (C6H₁2O6) for energy according to this chemical reaction: C6H12O6 +60₂-6CO₂ + 6H₂O The products of the reaction are carbon dioxide (CO₂) and water (H₂O). Interestingly, all of the carbon dioxide and much of the water exits the body through the lungs: on every breath, the average person exhales 500. mL of air, which is typically enriched to 4% CO₂ and 5% water vapor by volume. In short, when a person loses weight by dieting, the weight that is lost actually departs his body as a gas, every time he exhales. Each kilogram of body fat lost requires exhaling about 2.9 kg of carbon dioxide. Calculate how many breaths it takes an average person to "exhale" 1.00 kg of fat. Round your answer to the nearest thousand. You'll need to know that the density of CO₂ is 2.0 kg/m³. 0 ☐ ☐x10 X

Aqueous hydrobromic acid HBr reacts with solid sodium hydroxide NaOH to produce aqueous sodium bromide NaBr and liquid water H2O. If 10.0g of water is produced from the reaction of 58.3g of hydrobromic acid and 50.1g of sodium hydroxide, calculate the percent yield of water. Be sure your answer has the correct number of significant digits in it. I keep getting this problem wrong because of the sig. digits, dont round till the end because if it is off by 0.1, it will be incorrect.

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

Aqueous hydrobromic acid HBr reacts with solid sodium hydroxide NaOH to produce aqueous sodium bromide NaBr and liquid water H2O. If 2.35g of water is produced from the reaction of 74.4g of hydrobromic acid and 18.0g of sodium hydroxide, calculate the percent yield of water. Be sure your answer has the correct number of significant digits in it.