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Approximately how long would it take for a telephone signal to travel 3000 mi from coast to coast across the United States? (Telephone signals travel at about the speed of light.) What are the wavelength limits of the audible range of the sound spectrum? (Use the speed of sound in air.)
Determine the heat of combustion of Mg, first three empty Styrofoam cups were weighed with an electronic balance. The results were recorded.
Calculate the molar concentration of each ion in the beaker. Assume that none of the ions react with any of the other ions, and the volumes are additive
Compute the energy joules per particle of a photon of wavelength 45.8nm. Planck's constant is 6.63 x 10^-34 J.s
At 0.0oC, if the volume of air is 3.1 mL and the pressure of the atmosphere that day is 815 mmHg, what is the number of moles of air?
a gas sample has an original volume of 800 ml when collected at 710 mm and 30degc. what will be the volume of the gas
what is the molarity of a solution created by dissolving 75.3 grams of sodium carbonate in enough water to create 2.50
What will be the pH change when 23.0 mL of 0.100 M NaOH is added to 80.0 mL of a buffer solution consisting of 0.159 M NH3 and 0.183 M NH4Cl
Ozone molecules in the stratosphere absorb much of the harmful radiation from the sun. How many ozone molecules are present in 1.00 L of air under the stratospheric ozone conditions of 227 K temperature and 1.89 * 10^-3 atm pressure
One mole of an ideal gas is contained in a cylinder with a movable piston. The temperature is constant at 74°C. Weights are removed suddenly from the piston to give the following sequence of three pressures.
draw the structure of the major organic product in the following hydroboration-oxidation reaction. sia siamyl
State the balanced molecular, complete ionic and net ionic equations for each of the following acid-base reactions
If 545 mL of oxygen gas is collected at 21°C and 745 mmHg , what is its volume at STP?
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