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The dipole moment () of HBr (a polar covalent molecule) is 0.784 (debye), and its percent ionic character is 11.6 . Estimate the bond length of the bond in picometers.
An experiment shows that a 248 gas sample has a mass of 0.433 g at a pressure of 745 mm Hg and a temperature of 28 C. What is the molar mass of the gas?
Calculate at 25°C for this battery when [H2SO4] = 4.5 M, that is, [H+] = [HSO4-] = 4.5 M. At 25°C, ° = 2.04 V for the lead storage battery.
Calculate the molarity of a solution of glycerol made by dissolving 53.000 mL glycerol at 15 'C in enough water to make 270.00 mL of solution.
Discuss in detail, one way in which atomic nuclear decay takes place. What is the significance of atomic nuclear decay? Analyze the societal implications of using this process.
A sample of water is collected over water at a total pressure of 616.8 mmHg at 300 C. The vapor pressure of water at 300 C is 31.8 mmHg. What is the partial pressure of O2?
State the methods by which a radiation oncologist can administer these therapies. Additionally, state four major differences between the two modes of treatment.
Methanol (CH3OH) burns in air to produce carbon dioxide and liquid water. Calculate the heat released (in kilojoules) per gram of the compound reacted with oxygen. The standard enthalpy of formation
if 26mL of 5.4 M H2SO4 was spilled what is the minimum mass of NaHCO3 that must be added to the spill to neutralize the acid?
Assuming no loss of water and heat capacity for the vessel of 10.0 J/K, what is the final temperature of the system (c of copper = 0.387 J/g·K)?
A 457- sample of unknown HCL solution reacts completely with to form 16.1g CO2 . What was the concentration of the HCL solution?
Calculate the concentrations of H3O? and the pH of each acidic solution. Since HCl is a monoprotic acid, the H3O? concentration is equivalent to the HCl molarity.
What is the entropy change for a particle in this system if the final number of microstates is 0.617 times that of the initial number of microstates?
Iron can be prepared by the reaction of Fe2O3 with carbon according to the equation: If 401 g Fe2O3 and 205 g C are heated together, how many grams of iron could be produced?
When 228.4 mg of pure X was burned 627.4 mg of CO2 and 171.2 mg of H2O were obtained. Determine the simplest formula of the compound X.
You have isolated a strain of E. coli that is resistant to penicillin, streptomycin, chloramphenicol, and tetracycline. You also observe that when you mix this strain with cells of E. coli.
50.0 mL of 1.0 M HCl at 25.0oC were mixed with 50.0 mL of 1.0 M NaOH also at 25.0oC in a styrofoam cup calorimeter. After the mixing process, the thermometer reading was at 31.9oC. Calculate the ene
A 28.5 g sample of an unknown metal is heated to 95.0C and then dropped into 58.0 g of water in a coffee-cup calorimeter. The temperature of the water rises from 23.5 C to 27.1C. Calculate the speci
If the reaction between iron(III) ion and thiocyanate ion yielded an equilibrium concentration of 0.30 M for each of these ions, what is the equilibrium concentration of the red iron(III)-thiocyana
What is an example of a balance reaction beryllium is involved in for a common substance?
If the presure of 50.0 mL of oxygen gas at 100oC increases from 735 mm Hg to 925 mm Hg, what is the final volume? Assume the temperature remains constant.
How many milliliters (mL) of a 1.28 M sulfuric acid solution are needed to neutralize 60.2 mL of a 0.427M sodium hydroxide solution?
Tetrachloroethylene, C2Cl4, can be prepared by reacting acetylene (C2H2), chlorine and calcium hydroxide. The equation for the reaction is:
The most common source of copper is the mineral chalcopyrite . How many kilograms of chalcopyrite must be mined to obtain 385 of pure ?
One of the electrons falls from an outside orbit to an inside orbit giving off red light with a wavelength of 7.34 x 10-7 m. Calculate the frequency of the red light given off by the neon atom.