\( \mathrm{H}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \) বিক্রিয়াটির \( \mathrm{H}-\mathrm{H}, \mathrm{O}=\mathrm{O} \) এবং \( \mathrm{O}-\mathrm{H} \) এর বন্ধন শক্তি যথাক্রমে 102, 120 ও 115 kcal / mole, বিক্রিয়া তাপ কত?The bond energy \( \mathrm{H}-\mathrm{H}, \mathrm{O}=\mathrm{O} \) and \( \mathrm{O}-\mathrm{H} \) of the reaction \( \mathrm{H}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \) are 102, 120 and \( 115 \mathrm{kcal} / \mathrm{mole} \) , respectively. What is the heat of reaction?

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