The equation given here shows gaseous atoms of non-metal X and hydrogen combining to produce gaseous $\text{X}_2\text{H}_6$ molecules. $2\text{X(g)} + 6\text{H(g)} \rightarrow \text{X}_2\text{H}_6\text{(g)} \qquad \Delta H = -2775\,\text{kJ mol}^{-1}$ The bond energy for an X-H bond is $395\,\text{kJ mol}^{-1}$. Calculate the bond energy of an X-X bond.
- A$-405.0\,\text{kJ mol}^{-1}$
- B$-202.5\,\text{kJ mol}^{-1}$
- C$+202.5\,\text{kJ mol}^{-1}$
- D$+405.0\,\text{kJ mol}^{-1}$