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The titration required 287 s at a constant current of 24.25 mA to reach the endpoint.& ; Calculate the percentage of As2O3 (197.84 g/mol) in the insecticide
A 40.4g sample of glucose (a nondissociated, nonvolatile solute with the formula C6H12O6) is dissolved in 152.4 g of water. what is the vapor pressure of this solution at 100c?
A piece of silver with a total mass of 12.31 g was placed in a graduated cylinder filled with 10.00 mL of water. The density of silver is 10.50 g/mL. What will be the final volume in the graduated c
A compound of nitrogen and hydrogen was burned in air to produce nitrogen dioxide and water. The number of moles of nitrogen dioxide produced was 2.5 times the number of moles of water produced. Wha
The density of chloroform, a widely used organic solvent, is 1.4832 at 20 . How many milliliters would you use if you wanted 119.0 of chloroform?
How much Au will be plated out (from a solution containing Au3+ ) by the same amount of current that plates 10.5 g of Cu (from a solution of Cu2+ )?
Calculate the final temperature of 25.0 g of ethanol initially at 15C upon absorption of 565J of heat. (Density of ethanol = 0.789g/mL)
Several irregularly shaped pieces of zinc weighing 30.0g are droped into a graduated cylinder with an initial volume of 18mL. When the piece of zinc was dropped into the graduated cylinder, the wate
Calculate the theoretical yield of C2H3Cl when 120g of C2H6 reacts with 217g of Cl2, assuming that C2H6 and Cl2 react only to form C2H3Cl and HCl.
A He-Ne laser (mu=633nm) is used to heat up a sample. How many photons are needed to transfer 12 J of heat to the sample?
The water samples were the first to be analyzed. The analysis began by removing a number of aliquots. An aliquot is (a) a measure of the contamination of the lake water.
A pain-relieving pill has a mass of 0.005 g rm g. Express the pill's mass in grams using scientific notation or in milligrams.
A graduated cylinder contains 25.0 of water. What is the new water level after 34.2 of silver metal with a density of 10.5 is submerged in the water?
he molar enthalpy of vaporization of NH3 is 23.3 kJ/mol at its normal boiling point of -33.3 .C. How much energy is required to evaporate 1.00 kg of ammonia at -33.3 .C?
Calculate the enthalpy of vaporization of Br2. This element has vapor pressures of 271 mm Hg and 565 mm Hg at 30.0 .C and 50.0 .C, respectively.
Lakes that have been acidified by acid rain can be neutralized by liming, the addition of limestone (CaCO3 ). How much limestone in kilograms is required to completely neutralize a 3.8 x109 lake wi
A mass of 1.50 g H2O is sealed in an evacuated 3.0-L flask and heated to 55 .C. What mass of liquid water remains in the flask when equilibrium is established? The equilibrium vapor pressure of wate
Compound TACN contains three elements: carbon, hydrogen, and nitrogen. Combustion of 0.258 g of TACN yields 0.528 g CO2 and 0.270 g H2O. Determine the empirical formula of TACN.
In a reaction between pure acetic acid and sodium bicarbonate, 32.1 grams of sodium bicarbonate was added to 6.00 mL of acetic acid. Which reactant is the limiting reactant in this reaction?
The tire is filled with dry air at sea level and a temperature of 60 F to 32 lb/aquare in.standard sea level pressure is 101325 Pa at 0 C (STP). How many moles of air are contained in the tire?hoy
Assume you have a 150 ml of 0.1 M HCl solution. You took 100 ml from it and added 400 ml of distilled water into it. What will be the pH of this new HCl soluion?
In a city with heavy traffic, assume the air contains 5.78 X 10^-6 L of carbon monoxide per litre. Calculate the daily intake of carbon monoxide in litres by the person.
Because the production of this mixture yielded an indeterminate value for the amount of silver, another sample of the compound weighing 8.12 g was reacted with a solution of NaCl, yielding 5.57 g of
The density of liquid oxygen at its boiling point is 1.14kg/L , and its heat of vaporization is 213kJ/kg. How much energy in joules would be absorbed by 4.0 L of liquid oxygen as it vaporized?
calculate the mass of nitrogen dissolved at room temperature in an 89.0 L home aquarium. assume a total pressure of 1.0 atm and a mole fraction for nitrogen of 0.78.