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CHEMISTRY...IMPORTANT
2. If air is 20.9% oxygen by volume, a. how many liters of air are needed for complete combustion of 25.0 L of octane vapor, C8H18? b. what volume of each product is produced? 25L C8H18 x (25 mol O2/2 mol C8H18) = 312.5 L O2 (if
asked by Anonymous on October 12, 2013 
CHEMISTRY.....AND THIS IS IMPORTANT
2. If air is 20.9% oxygen by volume, a. how many liters of air are needed for complete combustion of 25.0 L of octane vapor, C8H18? b. what volume of each product is produced? 25L C8H18 x (25 mol O2/2 mol C8H18) = 312.5 L O2 (if
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What is the specific heat of a substance if 2100 J is required to raise a 312 g sample by 15 degrees Celsius? So I use the q = mcΔT formula 2100J = (312 g)c(85 °C  15 °C) I'm not sure if I did it right.
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A speaker which produces a frequency of 312 Hz is moving away from an observer and towards a wall at 3 m/s when it is 30 degrees Celsius. What is the frequency of the sound that travels directly to the observer? What is the
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