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能源问题是社会热点问题,是高考必考知识,其中与反应热有关的判断与计算是高考考查的重点,也是难点.现就其常见的题型分类例析.题型一:反应热化学方程式的正误判断例1(2014年海南高考题)标准状态下,气态分子断开1 mol化学键的焓变为键焓.已知H-H,H-O和O=O键的键焓ΔH分别为436 k J·mol-1、463 k J·mol-1和495 k J·mol-1.下列热化学方程式
Energy problem is a social issue, is the college entrance examination knowledge, which is related to the heat of reaction and calculation of the college entrance examination is the focus of investigation, but also difficult.Now it is a common analysis of the types of questions .Type 1: The reaction thermochemical equation , The enthalpy of 1 mol chemical bond in the gaseous molecule breaks down as the key enthalpy under the standard state of right and wrong judgment example 1 (2014 Hainan Entrance Examination). The bond enthalpies ΔH of the HH, HO and O = O bonds are known to be 436 kJ · mol - 1,463 kJ · mol-1 and 495 kJ · mol-1. The following thermochemical equations