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The land can also release nitrous oxide, a heat-trapping gas.
VOA: special.2009.07.28
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You could run the reaction, take solid iron gaseous oxygen, form iron oxide, measure the heat of formation of it, tabulate it.
你可以进行一个反应,用固态铁和氧气生成氧化铁，测量它的生成热，列成表格。
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So iron left to own devices in the atmosphere in the presence of a little bit of water, with the water form iron oxide.
铁在大气中，在存在,少量水的条件下，大气会开始与水结合产生氧化铁。
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But there is nothing saying you cannot take magnesium and mix it with oxygen and make magnesium oxide.
同样的道理，如果将镁,与氧一起反应，就会得到氧化镁。
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So I need to find out the heats of formation of the iron oxide and the water.
所以我需要找出氧化铁和,水的生成热，如果我这么做了。
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Does it strike you odd that maybe magnesium oxide, one of its applications would be refractories?
因此我们就会发现，氧化铝一个很重要的应用，就是耐火砖？
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That gives us 1 mole of calcium oxide and 1 mole of carbon dioxide.
摩尔的氧化钙,和1摩尔的二氧化碳。
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So we'll have an iron oxide species. It's a solid.
那么我们有氧化铁，它是固体。
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And he predicts the density of the oxide of the yet undiscovered element.
他预测这个还未被发现的元素的,氧化物的密度。
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2e Or I could have an oxide here, so I would put minus 2e.
或者这儿有一个氧化物，因此写作。
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That is why aluminum is so expensive because the oxide is so stable.
这就是为什么铝这么贵,因为氧化物稳定。
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Iron oxide. And, in fact, you can even couch things.
氧化铁，实际上，你能换个角度。
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And magnesium oxide has a melting point of 2,800 degrees C.
氧化镁,熔点在2800摄氏度。
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Aluminum oxide, aluminum plus oxygen.
氧化铝，铝加上氧。
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600kJ/mol Aluminum oxide almost 1,600 kilojoules per mole.
氧化铝几乎是。
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And if I do that then I can find out the change in enthalpy of this reaction. It's just going to be the heat of formation of these three moles of water, minus the heat of formation of the iron oxide. OK.
我就能得到这个,反应的焓的变化,它就是三摩尔水,的生成热，减去氧化铁的,生成热，好。
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We will get 100.1 g of calcium carbonate and then discover that we have 56.1 g of calcium oxide, and 44 g of carbon dioxide.
00。1g的碳酸钙,将得到56。1g的氧化钙，和44g的二氧化碳。
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