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A 0.1413 g sample of solidmagnesium is burned in a bomb calorimeter that has a heat capacityof 1769 J/°C. The calorimeter contains exactly 341 g of water, and the temperature increases by1.126&d
0.50 mol CCl4 gas is introduced into a 10.0-Lflask. What fraction of the total volume of the flask is occupied by CCl4 molecules?
In a "coffee cup calorimeter" 200 mL of 2.0M sodium hydroxide and 200mL of 2.0M hydrochloric acid are mixed. Both solutions were originally at 200 degrees C. After the reaction, the final temp is33.
What is the partial pressure of oxygen in air at atmospheric pressure (1 atm)? Assume ideal behavior.Express your answer numerically, in atmospheres.
Enter the net ionic equation for the reaction of aqueous sodium chloride with aqueous silver nitrate.Express your answer as a chemical equation.
The formation constant for Cu(CN)43- is 2.0 x1030. What is the standard free energy change for the process (in kJ/mol)? (Express your answer to 3 significant figures.)
A solution is made by dissolving 17.1 g of HCl in 661 mL ofwater. Calculate the pH of the solution. (Assume that the volume remains constant.)
For table salt - ingredients are: potassium iodide, glucose(dextrose), and calcium silicate. Which of these would be the active ingredient?
A piece of lead with a mass of 27.3 g was heated to98.90 C and then dropped into 15.0 g of water at 22.50 C. THe final temperature was 26.32 C. Calculater the specific heat capacity of lead from thi
What is the ranking in solubility between these functional groups? (most soluble to least soluble)Amine, amide, carboxylic acid, carboxylic acid with salt,phenol, alcohol, ketone
Given that you performed the extraction in a conical vial with ascrew cap, what practical reason makes this sodium bicarbonate extraction less desirable than sodium hydroxide extraction?
What aspects of benzoic acid synthesis are "green" and are suitableto be scaled up to an industrial synthesis? What aspects of the synthesis are not so ""green" and are not amenable to an industrial
The human eye contains a molecule called 11-cis-retinalthat changes conformation when struck with light of sufficientenergy. The change in conformation triggers a series of events that results in an
An amount of solid Ba(OH)2 is dissolved in water to make a final solution of 1520 mL. If the pH of this solution is found to be 12.11, how many grams of the base were added to make this solutio
105.0 mL of a solution of quinine contains 126.0×10-3 mol of quinine. Quinine is monobasic with Kb = 7.90× 10-6 If this is titrated with 0.200 M HCl, what is the pH half-way
If the root mean square speed of an O2 molecule is4.2 x 102 m/s at 25oC, what is the average speed of a Cl2 molecule at the same temperature?
Hydrogen and helium are mixed in a 20.0 L flask at room temperature (20oC). The partial pressure of hydrogen is250 mmHg adn that of helium is 75 mmHg. How many grams ofH2 and He are present?
Measurement of colligative properties is a classic method for determinatin of molecular weights. A mixture of a 1.0 g sample ofan unknown compound in 50 g camphor is found to have a melting point of
Calculate the change in internal energy, ΔE, of a system that absorbs 300 kj of energy as heat from the surroundings and does 350 kJ of work.
A handbook lists the solubility of carbon monoxide in water at0o C and 1 atm pressure as 0.0354mL CO per millimeter ofH2O. What pressure of CO(g) must be maintained above the solution to obtain 0
The decomposition of hydrogen peroxide is catalyzed by iodideion. The catalyzed reaction is thought to proceed by a two-step mechanism:
Iron (III) ions, calcium ions, and lead (II) ions are all in asolution. You want to separate the ions so that you have each onein solid form without the other ions
What ion has been formed at the second equivalence point?Estimate the pH of the solution at the second equivalence point.
Suppose that 0.88g of water condenses on a 75.0 g block of iron that is initially at 22 degrees C. If the heat released during condensation goes only to warming the iron block, what is the final tem
An amount of solid Ba(OH)2 is dissolved inwater to make a final solution of 1520 mL. If the pH of this solution is found to be 12.11, how many grams of the base were added to make this solution