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You have received three shipments of iron ores (impure iron sample)of the following weights: 2852, 1578, and 1877 lbs. There is anuncertainty on each weight of ± 5 lb.
When a 0.1 M aqueous ammonia solution is tested with a conductivity apparatus, the bulb glows dimly. When a 0.1 M hydrochloric acid solution is tested, the bulb glows brightly.
If a single layer of copper atom is 0.270 nm thick (atomic radius of copper = 0.135 nm), how many layers of copper atoms are in the galvanized coating?
L-Alanine has an enthalpy of formation of 560 +/- 1.7 kJ/mol. Write a balanced equation for the aerobic metabolism of alanine to urea, carbon dioxide, and water.
Unfortunately, the solid floats when placed in water, therefore traditional water displacement cannot be used. How can the displacement method used today be altered to determine the volume of the so
Canadian 10¢ and 25¢ coins are made of pure nickel which has a density of 8.902 g/cm3. Suppose each dime weighs 2.08 g and each quarter weighs 5.20 g.
A sample of chloroform is found to contain 11.3 g of carbon, 100.2 g of chlorine, and 0.95 g of hydrogen. If a second sample of chloroform is found to contain 23.2 g of carbon, what is the total ma
Butane's (C4H10) molar enthalpy of vaporization is 22.44 kJ/mol and its normal boiling point is -0.4 degrees C. A 250-mL sealed Erlenymeyer flask contains 0.55g of butane at -22 degrees C.
What is the age of a bone fragment from an archaeological dig if the bone shows an average of 2.5 radioactive events per minute per gram of carbon? Radioactive decay is kinetically a first-order pr
The molar heat capacity of ethane is represented in the temperature range 298 K to 400 K by the empirical expression Cp,m/(J K^-1 mol^-1)= 14.73 + 0.1272 (T/K).
A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.180 g of this subunit was dissolved in enough water to produce 2.00 \rm mL of solution.
A mixture of CH4 (methane) and C2H6 (ethane) weighs 68.00 grams and it is burned in with oxygen fuel. The products formed in this reaction are H2O and CO2 and these products weigh 13.00 grams. Find
Assuming that the mechanism has only one step, and that the products are 47 kJ lower in energy than the reactants, sketch approximate energy-level diagrams for the catalyzed and uncatalyzed reaction
The edge length of the unit cell of potassium metal, K, is 533 pm; the unit cell is body-centered cubic (one atom at each lattice point). Potassium has a density of 0.856 g/cm3. What is the mass of
Calculate the equilibrium Keq for the tRNA binding to the protein and Calculate the delta G knot for the binding. Remember to use full molar units (not mM) for Keq in this calculation.
Calculate the mass of the water vapor pressure present in a room of volume 400m3 that contains air at 27 degrees C on a day when relative humidity is 60%.
Attach a copy of the graph of the average class data for "mass of barium sulfate versus volume of barium chloride." What is occurring before the graph levels off? What is indicated after the graph
A 17.5 g mass of ice at 273K is added to 125g of H2O(l) at 325K at constant pressure. Is the final state of the system liquid or ice? calculate ?S for the process. Is the process spontaneous ?
If the vapor pressure of an aqueous solution of ethylene glycol C2H6O2 (62.06844 g/mol) was found to be 52.3 torr at 39.8 degrees C, calculate the grams of ethylene glycol used to make this solution
Gold is a very conductive and ductile metal. One gram of gold can be pulled into a wire 2 km long. The density of gold is 19.3 g/cm3 and the melting point is 1337.3 K. What is the diameter of this
In its brochure to customers that is required by the Safe Drinking Water Act, a water utility lists the concentration of Mg2+ as 1.8 mg/L. What are the molarity and normality of the magnesium ion i
It takes 10.00 ml of sodium hydroxide (aq) to titrate 6.216 g of KHP (HKC8H404) in water (M.W.KHP = 204.32g/mol) to the equivalence point using phenolphthalein indicator? What is the molarity of the
What problem would you encounter if the unknown component was acetaminophen rather than acetanilide or phenacetin, and you extracted the aspirin with 5 % NaOH? Explain, giving equations for any rele
How many milliliters of concentrated sulfuric acid of specific gravity 1.84 and containing 98% H2SO4 by weight should be used to make 1 liter of one normal (1 N) solution?
Calculate w for the adiabatic expansion of 1 mol of an ideal gas at an initial pressure of 2.25 bar from and initial temp of 475 K to a final temp of 322 K. Write and expression for work done in the