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The pka of the acid function at the 2-position is approximately 2, whereas that at the 1-position is about 3. Which of the two is more acidic and why?
if 7 moles of sulfur atoms and 10 moles of oxygen molecules are combined to form the maximum amount of sulfur trioxide, how many moles of which reactant remain unused at the end? 3S + 3O2 = 2SO3
Cumene,a hydrocabon is a compound composed only of C and H. It is 89.94% carbon, and its molar mass is 120.2g/mol. What are the empirical and molecular foemulas of cuene?
Assuming equal concentrations of conjugate base and acid, which one of the following mixtures is suitable for making a buffer solution with an optimum pH of 9.2 - 9.3?
A rifle is aimed horizontally at a target 50.0 m away. The bullet hits the target 1.70 cm below the aim point. What was the bullet's flight time? What was the bullet's speed as it left the barrel?
2ZnS + 3O2 = 2ZnO + 2SO2 how many moles of Zno are produces when 32 gms of oxygen is allowed to react with an excess of ZnS?
The bromination of anisole to provide the major product you proposed. Write the resonance structures for any charged, delocalized intermediates that are involved.
Calculate the equilibrium value of Pb+2(aq) in 1.00 L of saturated PbC12 solution to which 0.250 moles of NaCl(s) has been added. Assume that no volume change occurs.
With the engines off, a spaceship is coasting at a velocity of +290 m/s through outer space. It fires a rocket straight ahead at an enemy vessel. The mass of the rocket is 1400 kg, and the mass of t
Calculate the empirical formula of the hydrocarbon, if upon combustion at STP, 9.01 grams of liquid H2O and 11.2 liters of CO2 gas are produced.
Ignore friction and wind resistance. Find the magnitude and direction of the average force she exerts on the wall (which has the same magnitude, but opposite direction, as the force that the wall ap
mineral oil can be used in place of mercury n certain pressure-measuring instruments whan small pressure changes are to be measured. What is the pressure of and oxygen sample in mm of mineral oil it
If I burn 0.315 moles of hexane (C6H14) in a calorimeter containing 5.65 liters of water, what's the molar heat of combustion of hexane is the water temperature rises 55.4 ºC?
A car whose mass is 1600 kg (including the driver) has a maximum acceleration of 1.2 m/s2. If three passengers, each has a mass of 80kg are also in the car, what is the acceleration?
The thickness of a dollar bill is 0.15 mm. What is the height, in light-years of a stack of Avogadro's number of dollar bills? (Hint: 1 light-year is the distance that light travels in exactly 1 yea
A magnetic computer disk 9.40 cm in diameter is initially at rest. A small dot is painted on the edge of the disk. The disk accelerates 680.0 rad/s2 for 0.500s, then coasts at a steady angular veloc
If a bottle of nail polish remover contains 150 grams of acetone, how much heat would be released by its complete combustion?
Ann is driving down a street at 54 km/h. Suddenly a child runs into the street. If it takes Ann 0.744 s to react and apply the brakes, how far will she have moved before she begins to slow down?
If you are given a 0.33 g piece of sodium metal to react with water, how many moles of HCl would it take to neutralize the sodium hydroxide produced?
Consider a solution that is 0.10 M in a weak triprotic acid which is represented by the gen- eral formula H3A with the following ionization constants: K1 = 1.0 × 10-3, K2 = 1.0 × 10-8, K
A molecule of chlorine dioxide (ClO2) at 25oC has a velocity of 306 m/s. What is the kinetic energy in joules of the molecule at this temperature?
Compute the mass (in units of solar masses) of Sgr A* implied by the new results. Do the two stars give a consistent answer?
Assume that patient blood lead levels are 0.580 mg/L, that total blood volume is 5.1 L, and that 1 mol of succimer binds 1 mol of lead. What minimum mass of succimer in milligrams is needed to
Some of the sulfur dioxide ends up as sulfuric acid ( H2SO4) in acid rain. What mass,in grams, of sulfur dioxide is needed to react with 37.50 moles of oxygen?
A calorimeter contains 29.0 mL of water at 12.0, ^{circ}C. When 2.50 g of rm X (a substance with a molar mass of 50.0 g/mol) is added, it dissolves via the reaction