• Sản phẩm:
  \(2\text{CO}_2:2\times\left(\right.-393,50\left.\right)=-787,00\text{kJ}\)
• \(3\text{H}_2\text{O}:3\times\left(\right.-285,84\left.\right)=-857,52\text{kJ}\)
  → Tổng:
  \(-787,00+\left(\right.-857,52\left.\right)=-1644,52\text{kJ}\)
• Chất phản ứng:
  Chỉ tính \(\text{C}_{2} \text{H}_{6}\) vì \(\text{O}_{2}\) là đơn chất → \(\Delta_{f} H^{\circ} = 0\)
  \(\text{C}_2\text{H}_6:-84,70\text{kJ}\)

\(\Delta_{r}H^{\circ}=-1644,52-\left(\right.-84,70\left.\right)=-1644,52+84,70=\boxed{-1559,82\text{kJ}}\)

Save the Elephants is a non-profit organization dedicated to protecting elephants from extinction through conservation efforts, research, and public education. The organization was founded in 1993 by elephant researcher Dr. Iain Douglas-Hamilton. One of Save the Elephant's primary focuses is on the protection of elephant populations and their habitats. The organization also conducts research on elephant behavior, ecology, and genetics to inform conservation efforts and promote better understanding of these magnificent animals. In addition to their conservation work, Save the Elephants is committed to educating the public about the importance of elephant conservation and the threats facing these animals. The organization produces educational materials, conducts outreach programs, and works with local communities to raise awareness about the importance of protecting elephants and their habitats. Overall, Save the Elephants is a vital organization in the fight to protect these majestic animals from extinction.