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The hydrogen gas formed in a chemical reaction is collected over water at 30 at a total pressure of 737. What is the partial pressure of the hydrogen gas collected in this way
galvanic sell is formed from a copper electrode and magnesium electrode in solutions containing their salts in 1.0M concentrations Mg(s)/Mg2+(aq)//Ag1+(aq)/Ag(s)
A 0.0050 molar solution of sugar is separated from pure water by a membrane at 20 C. What is the osmotic pressure?
A 1-ft-diameter cylinder is closed on one end and fitted with a moveable piston on the other. With 1 atm applied pressure, the piston is located 20 ft from the closed end
What are the similarities between the Rutherford-Bohr atom and the modern quantum mechanical model? What are the differences? Why is the Rutherford-Bohr model still useful? In what situations would you use one model over the other? Why?
What is the initial sulfur dioxide concentration (in mol/L or M)?
Need to make an aqueous solution of 0.233 M potassium iodide for an experiment in lab, using a 250 mL volumetric flask. How much solid potassium iodide should you add?
A 1.3717-g sample of impure oxalic acid dihydrate, H2C2O4·2H2O, required 34.49 mL of 0.1211 M NaOH for titration to the phenolphthalein end point (both protons neutralized). Calculate the percent oxalic acid dihydrate in the sample.
magnetite was found to contain 2.5698 g of iron and 0.9816 g oxygen. What is the empirical formula for this oxide of iron?
Serum taken from a patient being treated with lithium for manic-depressive illness was analyzed for lithium concentration. A reading of 326 units was obtained for the intensity of the 671 nm red emission line.
oxygen is burned completely, 3.86 grams of CO2 and 1.26 grams of H2O are produced. What is the empirical formula of the compound?
A sample consisting of 3.0 mol of ideal gas molecules at 200K at 2.00 atm is compressed reversibly and adiabatically until the temperature reaches 250K.
115 mL of H_2O is initially at room temperature 22 0C. A chilled steel rod at 2 0C is placed in the water. If the final temperature of the system is 21.1 0C, what is the mass of the steel bar.
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