2. Unspecified amounts of CaCl2 + 2H20 and K2C2O4 H2O were reacted and the calcium oxalate precipitate was allowed to settle to the bottom of the beaker. Two samples of clear supernatant
were tested for the presence of unreacted ions by adding calcium chloride to one sample and
potassium oxalate to the other. The sample in which calcium chloride was added showed the
formation of a white precipitate whereas the sample in which potassium oxalate was added
remained a clear solution. From this profile, identify the limiting reactant. Justify your answer.
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Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced. be sure your answer has the correct number of significant digits.

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

What was bohr’s contribution to the planetary model