Calculate the mass percent of ethane in the original mixture
A 9.775 g. gaseous mixture contains ethane (C2H6) and propane (C3H8). Complete combustion to form carbon dioxide and water requires 1.120 mol of oxygen. Calculate the mass percent of ethane in the original mixture.
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Aspirin is produced in a student lab. One mole of salicylic acid (MM 138 g/mole) reacts with one mole of acetic anhydride. write a balanced chemical equation in word. How much is the percent yield?
Bronze is an alloy consisting of 88.0% copper and 12.0% tin. The density of copper is 9.28 g/mL and the density of tin is 7.48 g/mL. Calculate the approximate density of bronze.
A calibrated flask was filled to the 25 mL mark with ethyl alcohol. By weighing the flask before and after adding the ethyl alcohol, it was determined that the flask contained 19.7325 g of alcohol. In a second experiment, 25.0920 g of metal beads
Water is being pumped from a large lake to a reservoir 30 m above at a rate of 5x10-3 m3/s by a 12 kW (shaft) pump. If the irreversible head loss of the piping system is 8m, determine the mechanical efficiency of the pump.
A volume of 80.0 mL of a 0.520 it M rm HNO_3 solution is titrated with 0.590 it M rm KOH. Calculate the volume of rm KOH required to reach the equivalence point
A 6-in-diameter cast-iron (E = 14.5x106 psi; ? = 0.211) wheel, 2 in wide, rolls on a flat steel (E = 30.0x106 psi; ? = 0.292) surface carrying 800 lb load.
Determine the solubility of N2 in water exposed to air at 25 C if the atmospheric pressure is 1.2 atm. Assume that the mole fraction of nitrogen is 0.78 in air and the Henry's law constant for nitrogen in water at this temperature is 6.1 10-4 M/at
An experiment requires 45.8 g of ethylene glycol, a liquid whose density is 1.114 g/mL. Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use?
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Which of the following best describes the rationale of those public officials who are promoting the policy referenced in the title of the Texas Tribune article?
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