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A Federation starship (2.0 x 106 kg) uses its tractor beam to pull a shuttlecraft (2.0 x 104 kg) aboard from a distance of 10 km away. The tractor beam exerts a constant force of 4.0 x 104 N on the
Enough of a monoprotic acid is dissolved in water to produce a 0.0142 M solution. The pH of the resulting solution is 2.51. Calculate the pKa for the acid
The standard heat of combustion of butane gas, C4H10, at 25 ° C is - 2.880 x 103 kJ mol-1 when the products are CO2 (g) and H2O (l). Calculate the value of ΔH ° if the combustion produ
In a gas phase equilibrium mixture of H2, Cl2, and HCl at 300 K, [HCl] = 0.0036 mol/L and [Cl2] = 0.00485 mol/L. Calculate the concentration of H2. Kc = 4 × 1031 at this temperature.
An object is placed on a horizontal surface which oscillates vertically with simple harmonic motion. When the frequency is increased to 7HZ, the object is on the point of losing contact with the sur
What is the density of a sample of ammonia gas, NH3, if the pressure is .928 atm and the temperature is 63.0 C
certain first-order reaction has a rate constant of 2.50×10-2 s-1 at 17 C. What is the value of k at 50 C if Ea = 85.0 kj/mol?
Sanger's reagent, 2,4-dinitrofluorobenzene, is a good substrate for nucleophilic aromatic substitution. Show the product of the following reaction.
A proton (mass= 1.7×10-27 kg, charge= 1.6×10-19 C) travelling with speed 106 m/s enters a region of space containing a uniform magnetic field of 1.2 T. What is the time t required for th
The mechanisms of aspartate protease catalysis is proposed to be a. covalent nucleophilic catalysis b. covalent electrophilic catalysis c.
Calculate the amount of heat transferred when 44.0 g of CH3OH(g) is decomposed by this reaction at constant pressure.
What mass of sucrose should be combined with 543 g of water to make a solution with an osmotic pressure of 8.00 atm at 285 K? (Assume the density of the solution to be equal to the density of the so
A 4.40 g nugget of pure gold absorbed 252 J of heat. What was the final temperature of the gold if the initial temperature was 25.0°C? The specific heat of gold is 0.129 J/(g·°C).
The initial bond formation in the covalent intermediate in the chyomotrypsin catalyzed reaction is between a. serine and the carbonyl in the peptide backbone.
compound contains 69.94 percent iron and 30.06 percent oxygen. What is the molecular formula if the molar mass of the compound is 199.55 grams per mole?
If the solubility of a particular solute is 24.3 g/100 g H2O at 20°C, which of the following solution concentrations would represent a supersaturated aqueous solution of the solute?
If 12.5 g of CCl3F is enclosed in a 1.1 -L container, will any liquid be present? What is the mass of the liquid? The vapor pressure of CCl3F is at 300 K is 856 torr
Consider a 1.00-L solution containing 85.5 g Al2(SO4)3 (FW = 342.15) and 21.3 g Na2SO4 (FW = 142.06). What are the molar concentrations of aluminum, sodium, and sulfate ions, respectively
The bullet becomes embedded in the block. If the bullet-block system compresses the spring by a maximum of 88.0 cm, what was the speed of the bullet at impact with the block?
A patient needs to take 375mg of ibuprofen twice daily. The pills in the bottle are each 250. mg. How many pills does the patient need to take each time she wants the 375mg dosage? Assume that these
What's the actual Ka value of potassium hydrogen tartrate?
The observed osmotic pressure of this solution is 7.83 atm at 25°C. What percentage of the moles of NaCl in this solution are ion pairs?
The mass of a robot is 5900 kg. This robot weighs 3770 N more on planet A than it does on planet B. Both planets have the same radius of 1.33 multiplied by 107 m. What is the difference MA - MB in
A student places 59.5 g of a diatomic gas into a 10.0-L container at 298 K and measures the pressure to be 2.053 atm. Determine the identity of the diatomic gas.
A 280-{rm mL} flask contains pure helium at a pressure of 753 {rm torr}. A second flask with a volume of 480 {rm mL} contains pure argon at a pressure of 723 {rm torr} what is the partial pressure