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A 70.0kg diver stands on the free end of a diving board that is in equilibrium. The length of the diving board is 3.50m. The fixed end of the diving board is 1.50m from the fulcrum. Determine the ma
Two identical diverging lenses are separated by 17 cm. The focal length of each lens is -8.0 cm. An object is located 4.0 cm to the left of the lens that is on the left. Determine the final image di
Using values of ΔfG, calculate ΔrG for each of the following reactions at 25 degree C. Is the this a product favored at equilibrium?
ΔHvap = 31.3 kJ/mol for acetone. If 1.40 kgof water were vaporized to steam in a boiler, how much acetone ( inkg) would need to be vaporized to use the same amount of heat?
A student mixed 10 ml of 0.2 M KI with 20 ml of1.75x10-3 M of Na2S2O3and 30 ml of 0.050 M of(NH4)2S2O8. What is the molarity of KI?
Calculate the approximate standard feeenergy change for the ionization of hydrofluoric acid, HF (Ka= 1.0X 10^-3), at 25 °C. (at equilibrium)
A 3.00-liter flask initially contains 1.50 mol of gas A and .450mol of gas B. Gas A decomposes according to the following reaction:
A major buffer in the blood is the carbonic acid/ bicarbonate ion equilibrium. If the pKa of carbonic acid is 6.37, what must the ratio of bicarbonate ion to carbonic acid be in the blood to mainta
If HNO3 could not be found and I added6M HCl instead, what affect does this have on the test for sulfide ion. Explain. What affect does this have on subsequent tests of the supernatant? Explain.
The Goodyear blimps, which frequently fly over sporting events, hold approximately 175,000 ft^3 of helium. If the gas is at 23o C and 1.0 atm, what mass of helium is in the blimp?
Suppose a sample of NaCl increased in temperature by 2.5k whend the sample absorbed 1.7 *10 square j of energy as heat. calculate the number of moles of nacl if the heat capacity is 50.5 j/k*mol
What is the oxidation state and d electron count (numberof d electrons) for the metal ion in the following coordination complex ? Na3[IrCl6]
How high in meters must a column of water be to exert a pressure equal to that of a 760-mm column of mercury? The density of wateris 1.0 g/mL, whereas that of mercury is 13.6 g/mL.
Oxygen masks for pruducing O2 in emergency situations contain potassium superoxide, KO2. It reacts with CO2 and H2O in exhaled air to produce oxygen:
Which concept describes the formation of four equivalent,single, covalent bonds by carbon in its compounds that resemble methane, CH4?
A photographic film needs aminimum of 80.0 kJ/mol for exposure. What is the longest wavelength of radiation with sufficient energy to expose the film?
Consider a sample of N = 12 molecules distributed among three non-degenrate energy levels with energies of 0, 2ε, 3ε. The available energy E is 12ε. What is the number o
What would be the volume of a balloon filled with 4.77 L ofH2 gas collected at 1,553 mmHg if the pressure were increased to 2,131 mmHg?
Describe the impact that temperature has upon whether a reactionis subject to kinetic or thermodynamic control.
Why is it particularly important in the experiment "kinetic an thermodynamic control of a reaction" that the semicarbazones be dry before their melting points are determined?
The combustion of 0.1579 gbenzoic acid increases the temperature of a bomb calorimeterby 2.35°C. Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic ac
What is the pressure in atmospheres on the body of a diver if he is 32 ft below the surface of the water when atmospheric pressure at the surface is 0.94 atm?
A NASA satellite has just observed an asteroid that is on a collision course with the Earth. The asteroid has an estimated mass, based on its size, of 5 X 10^9kg. It is approaching the Earth on a he
What is the torque produced about the fulcrum by a 100.0kg mass resting on a see-saw of length 2.00m at a distance of 0.500m from the center of mass? The mass of the see-saw is 25.0kg and the center