Question-molarity of the ethanol
A solution of ethanol (C2H5OH) in water is prepared by dissolving 63.5 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution. What is the molarity of the ethanol in this solution?
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Consider the nitryl cation,NO2+. Write all possible Lewis structures for this ion. Draw the molecule by placing atoms on the grid and connecting them with bonds.
What is the simplest formula for Chalcocite if a sample of this ore contains 8.274 g copper and 2.088 g sulfur?
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Johnson Industries received a contract to develop and produce four high-intensity long-distance receiver/transmitters for cellular telephones. The first took 2,000 labor hours and $39,000 worth of purchased and manufactured parts; the second to
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how many calories of heat energy was absorbed? Express our answer numerically in calories using two significant figures.
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