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What is the ratio of n(h)/n(0) of the density n(h) of molecules at height h to the density n(0) of molecules at height 0 ? Hint: use Maxwell-Boltzmann statistics and consider the gravitational poten
Why is a large steroid molecule such as oestrone able to cross the cell membrane and a smaller steroid molecule sich as adrenaline can not?
An electron traveling at 471 m/s enters a 3 T magnetic field. The angle between the velocity and the field is 142o. Find the radius of the resulting circular path.
If a chemical reaction: A + B → C + D isendothermic, what is the sign of ΔH for the reaction? Would the temperature recorded in the calormeter well for such a reaction increase or decreas
Suppose that you wish to fabricate a uniform wire out of 1.10 g of copper. If the wire is to have a resistance R = 0.800 , and if all of the copper is to be used.
What is the molarity of a KOH solution prepared by dissolving1.350g KOH in enough water to make a solution with a total volumeof 250.0 mL?
Vinegar is a dilute solution of acetic acid. A 15.64 mLsample of vinegar with a density of 1.06g/mL requires 24.80 mL of 0.469 N KOH for titration. What is the percent by mass of acetic acid in vine
Calculate the average H-S bond enthalpy in H2S(g) given that the standard enthalpies of formation of H2S(g), H(g) and S(g) are-20.1, 218.0, and 223.0 kJ/mol, respectively.
Calculate the entropy change for converting 1 mol of mercury vaporat 650 K to liquid mercury at 500K. The molar heat capacitiesof Hg(l) and Hg(g) are 28.0 and 21.0 J/K.mol, respectively.
One of the fastest super computers cab perform about 12 teraflpos. Determine how manyseconds it would take this computer to count a mole of things.
A helium filled water balloon is launched from the ground where the pressure is 752mmHg and temperature is 21c. Under these conditions it's volume is 75L.
The osmotic pressure of blood is 7.65 atm at 37 ?C. What mass ofglucose (C6H12O6, molar mass = 180.2 g/mol) is needed to prepare5.00 L of solution for intravenous injection?
Suppose that a particular moment during the reaction, molecularhydrogen is reacting at a rate of 0.044M/s. At what rate is ammonia being formed?
A yellow compound dissolved in methylene chloride is added toa chromatography column. The elution is begun using petroleum ether as the solvent.
What is the rate constant for the first order decay of acertain radioactive isotope if the concentration drops from 0.50Mto 0.050 M in 1.0 years?
A mixture of NaCl and sucrose (C12H22O11) of combined mass10.2g is dissolved in enough water to make up a 250ml solution. The osmotic pressure of the solution of the solution is 7.32 atm at250C. Cal
The freezing point depression constant for water is -1.86 ?C/m. If 5.00 g Na2SO4 is dissolved in 45.0 g H2O,the freezing point is changed by -3.82 ?C. Calculate the van't Hofffactor for Na2SO4
Tarzan swings on a 33.0 m long vine initially inclined at an angle of 39.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest?
A 17.0 kg child on a 3.00 m long swing is released from rest when the ropes of the swing make an angle of 26.0° with the vertical. (a) Neglecting friction, find the child's speed at the lowest p
Calculate the pH after 0.120 g ofsolid NaOH is added to 150 mL of this buffer solution.c. If the acceptable buffer range of the buffer solution is ±0.10 pH units, calculate how many moles
How far from the edge of the counter does the cat land? What is cat's velocity when it lands on the counter?
Q1. A balloon is electrosatically charged with 3.4 uC (microcoulombs) of charge. A second ballon 23 cm away is charged with -5.1 uC of charge. the force of attraction/repulsion between the two charg
What volume will a sample of hydrogen occupy at 270.2 K ifthe gas occupies a volume of 2.23 liters at a temperature of 0.0oC? Assume that the pressure remains constant.
Heavy metal azides, which are salts of hydrazoic acid,HN3, are used as explosive detonators. A solution of0.10 M hydrazoic acid has a pH of3.36. What is the Kafor hydrazoic acid?
What is/are the equation that you begin with and how are the boundary conditions applied to them in order to get to a calculable equation for fundamental frequency?