问题描述:
大学普通化学中焓(H)与吸放热(Q)的区别?就是内能U=Q+W,焓H=U+PV,看不懂~
最佳答案:
Q=H2-H1=ΔH 它表明恒压过程中的热等于系统焓的变化,也就是说,只要确定了过程恒压和只做体积功的特点,Q就只决定于系统的初末状态. 焓的物理意义可以理解为恒压和只做体积功的特殊条件下,Q=ΔH,即反应的热量变化.因为只有在此条件下,焓才表现出它的特性.例如恒压下对物质加热,则物质吸热后温度升高,ΔH>0,所以物质在高温时的焓大于它在低温时的焓.又如对于恒压下的放热化学反应,ΔH
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