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How large a sample is needed to estimate a population proportion within 2.5% at the 99% confidence level if you have no reasonable estimate of the population proportion? Do the problem again if you have data to show that the population proportion is .7.
How many possible trisubstituted derivatives C6H3X2Y can be obtained from the para disubstituted benzene C6H4X2?
If the Ka of a monoprotic weak acid is 2.0x10-6, explain what is the ph of a 0.16 M solution of this acid
Calculate E°cell and indicate whether the overall reaction shown is spontaneous or nonspontaneous. O2(g) + 4H+(aq) + 4e- Picture 2H2O(l); E° = 1.229 V Al3+(aq) + 3e- Picture Al(s); E° = -1.662 V Overall reaction: 4Al(s) + 3O2(g) + 12H+(aq) ? 4Al3+..
a. what are the energies of the n=1-7 levels? b. what is the energy difference between n=6 and n=7? c. what does this very approximate calculation compare with experimental values
An unknown substance contains only C, H, and, O. Combustion of 190.81 mg sample of the substance produces 387.77 mg CO2 and 72.17 mg H20.
A runner in training ran a pace test at a truck and came up with the following 1.0 mile lap times in minutes/seconds.5:54, 6:02, 6:04, 6:09, 5:48. a) What was his average pace in minutes per mile?
While the radio waves transmitted by a radio station have a frequency of 81.7 MHz, Define the wavelength of the waves, in meters
How many liters of oxygen gas, at standard temperature and pressure, will react with 25.0 grams of magnesium metal? 2 Mg + O2 yields 2 MgO
Determine the phase composition and temperature when equilibrium is reestablished?
A neon sign is made of glass tubing whose inside diameter is 2.5 cm and whose length is 5.5 cm. If the sign contains neon at a pressure of 1.75 torr at 35o Celcius
A 10 liter sample of oxygen 0.0°C and 15 cm. pressure is subjected to 150 cm. pressure at the same temperature. What is the new volume of the oxygen?
Draw a graph that explains the distribution of the kinetic energies of gas particles when the gas is at two different temperatures. Label the axes. On one axis show the average kinetic energy at each temperature.
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