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A laboratory sample of gas is known to have a carbon monoxide concentration of 50 ppm. A spectrophotometer is used to take five independent measurements of this concentration. The five measurements, in ppm, are 51, 47, 53, 52, and 52. Suppose the spectrophotometer has been recalibrated, so we may assume that the bias is negligible. The spectrophotometer is now used to measure the CO concentration in another gas sample. The measurement is 56.9 ppm. How should this measurement be expressed? Round your final answers to one decimal place.
_____ (plus or minus)_____ ppm
Choose the answer in which the two atoms are listed in order of increasing ionization energy
A 7.45-L container holds a mixture of two gases at 35 °C. The partial pressures of gas A and gas B, respectively, are 0.368 atm and 0.852 atm.
A gas expands and does P-V work on the surroundings equal to 325 J. At the same time, it absorbs 161 J of heat from the surroundings. Calculate the change in energy of the gas.
what hybrid orbitals are used about the central atom of each of the angles.
Balanced chemical equation for the combustion of liquid ethanol c2h5oh, in oxygen, yielding gaseous carbon dioxide and water vapor.
The reaction 2H2(g) + 2NO(g) -> 2H2O(g) + N2(g) is first order in h^2 and second order in No at a particular temperature. What is the rate law
Draw a structure containing only carbon and hydrogen that is a chiral alkyne with six carbon atoms.
calculate the molarity (M) of the solution when water is added to prepare each of the following: a)25.0 mL of a 18.0 M HCl solution is diuted to 500 mL. b)50.0 mL of a 1.50 M NaCl solution is diluted to 125 mL. c)4.50 mL of a 8.50 M KOH solution i..
in most of its ionic compunds cobalt is either coii or coiii. one such compound containing chloride ion and water of
A radioactive element has a half-life of 2.2 hours. How many hours will it take for the number of atoms present to decay to one-sixteenth of the initial value? Show your calculations please.
How much heat is required to raise the temperature of 50.0 grams of water from 35 degree C to 55 degrees C
Either bulb will be used for 2,000 hours per year at an electricity cost of $0.14/kwh (kilowatt-hour). If the interest rate is 6%, which bulb is more cost effective over 8,000 hours of use based upon a comparision of Net Present Values?
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