作者yangway (休斯)
看板Chemistry
标题[请益]物理化学 标准生成能跟焓
时间Mon Feb 21 19:12:28 2011
题目:
A sample of potassiun(K,atomic weight =23) of mass 2.140g undergoes
combustion in a constant-volume calorimeter with a calorimeter constant
1849 J/K at room temperature,After the reaction completes, the temperature
and inner water bath that contains 1450g of water increases by 2.62K (1cal=
4.184J)
求标准生成能 跟 标准生成焓 for K2O
物化不好，完全不知道怎麽算，想请各位指点一下。
我只会算 1450*2.62*4.184=15895J <让水上升2.62K所需要的J)
之後就卡住了。
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1F：推 choke:这不是今年台联考的题目吗@@ 02/22 00:05
2F：→ x06Cc:应该用黑斯定律吧 02/22 19:47