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For the reaction represented by the equation Cl2 + 2KBr ® 2KCl + Br2, calculate the percentage yield if 200. g of chlorine react with excess potassium bromide to produce 410. g of bromine.
The heat of vaporization of benzene, C6H6 , is 30.8 kJ/mol at its boiling point of 80.1 °C. How much heat is required to vaporize 128 g benzene at its boiling point.
What is partial pressure?What is the relationship between the partial pressuresof each gas in a sample and the total pressure of gas in the sample?
Liquid Heptane, C7H16, burns in oxygen gas to yield carbon dioxide and water. What mass of carbon dioxide is produced when 15.0 mL of heptane burns completely?
If 3.30 moles of ethane, C2H6 undergo combustion,according to the unbalanced equation C2H6+O2--> CO2+H2O, how many moles of oxygen are required?
Magnesium oxide decomposes into magnesium and oxygen. If 12.09 of magnesium oxide decomposes to form 7.29 of magnesium, what mass of oxygen gas is also released in the reaction? Express the mass of
The specific heat of ice is 2.09 J/g°C, the specific heat of liquid water is 4.18 J/g°C, the specific heat of steam (water vapor) is 2.01 J/g°C, the heat of fusion is 6.01 kJ/mol at 0&de
What volume of fuel should you bring? Assume each of the following: the fuel has an average formula of C7H16; 15% of the heat generated from combustion goes to heat the water.
Boron has two naturally occurring isotopes, 10B (19.9%)and 11B (80.1%). Although the B2 moleculedoes not exist naturally on Earth, it has been produced in thelaboratory and observed in stars. (a) Ho
How enzymes work Sometimes the difference in (standard) free-energy content, G", between a substrate S and a product P is very large, yet the rate of chemical conversion, S P, is quite slow. Why?
A metal object with a mass of 19g is heated to 96 degrees Celsius, then transferred to a calorimeter containing 75g of water a1 18 degrees Celsius. The water and metal object reach a final temperatu
Calculate the pH of a buffer that is 0.158 M HClO and 0.099 M NaClO. The Ka for HClO is 2.9 x 10-8
When a 45 g sample of an alloy at 100 c is dropped into 100 g of water a 25C, the final temperture is 37 C. what is the specific heat of the alloy?
For Na+ and Mg+ ions, compare the ratios of the number of ions in the 3p excited state to the number in the ground state in
At 50 degree's Celsius the vapor pressure for methanol and ethanol are 406 and 222 torr, respectively. Given a mixture at 50 degree's Celsius that contains 0.2 mol of methanol and 0.1 mol of ethanol
Addition of HBr to 1-phenylpropene yield only (1-bromopropyl)benzene. Propose a mechanism for the reaction and explain using resonance structures why none of the other regioisomer is produced?
A spherical balloon containing 5.035 mg of hydrogen gas in its standard state of aggregation behaving ideally is attached to one end of an open tube cylindrical mercury manometer (see figure) where at
An automobile gasoline tank holds 22 kg of gasoline. When the gasoline burns, 83 kg of oxygen is consumed and carbon dioxide and water are produced. What is the total combined mass of carbon dioxide
Chloral hydrate (C2H3Cl3O2) is a drug formerly used as a sedative and hypnotic. It is the compound used to make "Mickey Finns" in detective stories.
Calculate the mass of ethylene glycol (C2H6O2) that must be added to 1.00 kg of ethanol (C2H5OH) to reduce its vapor pressure by 12.0 torr at 35 degrees C. the vapor pressure of pure ethanol at 35 d
A sample of nitrogren gas is collected in a 100 mL container at a pressure of 688 mm Hg and a temperature of 565 degrees C. how many grams of nitrogen gas are present in this sample?
A patient needs to take 625 of ibuprofen twice daily. The pills in the bottle are each 250. How many pills does the patient need to take each time she wants the 625 dosage?
A sample of neon gas is held in a rigid 1.814L container with a pressure of 1.273atm at 25 C. 3.193g of an unknown gas is added to the container. The temperature remains constant, but the pressure r
How would you prepare 100ml of 0.5M NaOH? Calculate the mass of NaOH needed, and describe the procedure and glassware you would use.
Draw an electron-dot structure for hydrogen peroxide. Write balanced chemical equations for reactions of hydrogen peroxide, and tell whether hydrogen peroxide is acting as an oxidizing agent or a redu