Coal mining operations in certain regions of the United States have created vast amounts of waste coal known as culm. Some power plants have been built near culm banks to generate electricity from this waste resource. Using a gravimetric analysis for culm of 43% carbon, 36% ash, 15% moisture, 3% oxygen, and trace amounts of hydrogen, nitrogen, and sulfur, evaluate its standard chemical exergy relative to the exergy reference of Table A-26, Model II. Also determine the standard chemical exergy of anthracite coal. Investigate the advantages and disadvantages of using culm instead of coal in power plants. Write a report summarizing your findings, including a comparison of the chemical exergy values obtained, sample calculations, and at least three references.