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A Standard Reference Material is certified to contain 94.6 ppm of an organic contaminant in soil. Your analysis gives values of 98.6, 98.4, 97.2, 94.6, and 96.2 ppm. Do your results differ from the expected result at the 95% confidence level? If you made one more measurement and found 94.5, would your conclusion change?
What is the rate constant for the reverse reaction at the same temperature?
How many milliliters of a 235 mL solution of 1.5 M AlCl3 must be used to make 61 mL of a solution that has a concentration of 0.5 M Al3+?
Strontium-90 is one of the products of the fission of uranium-235. This strontium isotope is radioactive, with a half-life of 28.1 yr. Calculate how long it will take for 0.600 g of the isotope to be reduced to 0.310 g by decay.
A bicycle tire is filled with air to a pressure of 720 torr at a temperature of 19 degrees Celsius. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58 degrees Celsius.
A 31.0 sample of an unknown H3PO4 solution is tritrated with a 0.120M NaOH solution. The equivalence point is reached when 26.43 mL of NaOH solution is added. What is the concentration of the unknown H3PO4 solution
If 37.4 grams of water decomposes at 297 Kelvin and 1.30 atmospheres, how many liters of oxygen gas can be produced? 2 H2O (l) yields 2 H2 (g) + O2 (g)
A buffer solution is made by adding 5.05 g of KOH (56.1 g/mol) to 500.0 mL of 0.400 M benzoic acid, HC7H5O2 (Ka = 6.6×10^-5). Calculate the pH of the solution that results when 100.0 mL of 0.150 M HCl is added to the above buffer (total volume is 6..
using a carbon dioxide sample that occupies a 2.54 dm3 volume container at standard conditions. determine the volume of
CO2 + H2 --> CO + H2O (all are gaseous) At equilibrium the container is found to contain 0.0883 M CO2. What is the equilibrium constant, Kc, for the reaction
A 773 mL sample of NO2 gas is at STP. If the volume changes to 648 mL and the temperature changes to 15ºC, what will be the new pressure in atmospheres
Explain Why a glacial Acetic acid in a conductance set-up does forms gradually brighter lights that is dim to bright because it is frequently diluted with water?
The flask was then shaken until the solution was uniform. A 30.0-\rm mL sample of this glucose solution was diluted to 0.500 \rm L. How many grams of glucose are in 100. \rm mL of the final solution
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