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Compressed natural gas is chiefly

  • A.methane
  • B.propane
  • C.butane
  • D.a mixture of hydrogen and carbon monoxide

Answer: A

Because methane's critical temperature is far below ambient it cannot be liquefied by pressure alone and is stored as a compressed gas at about 200 bar. Its high hydrogen to carbon ratio makes it the cleanest of the fossil fuels per unit of heat.

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