磷在氧气中燃烧，可能生成两种固态氧化物。3.1 g的单质磷（P）在3.2 g氧气中燃烧，至反应物耗尽，并放出X kJ热量。
（1）通过计算确定反应产物的组成（用化学式表示）是___________，其相应的质量（g）为_______。
（2）已知单质磷的燃烧热为Y kJ/mol，则1mol P与O2反应生成固态P2O3的反应热ΔH＝________。
（3）写出1mol P与O2反应生成固态P2O3的热化学方程式：_____________________。
（4）若3.1g磷在3.6g的氧气中燃烧，至反应物耗尽，并放出zkJ热量，则x____（填“>”“<”或“=”）z。
（5）磷的两种氧化物中，___稳定。
(1)P2O5、P2O3；2.75g、3.55g
(2)-(20X-Y)kJ·mol-1
(3)
(4)<
(5)P2O5
| 阅读理解。 | ||
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| 1. How many bedrooms are there on the second floor of the house? | ||
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| A. Four. B. Five. C. Six. D. Seven. | ||
| 2. Which is NOT true about the house? | ||
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| A. It has a garden around it. B. It is by the beach. C. It is by a busy street. D. It is large. | ||
| 3. Which is TRUE about the apartment? | ||
[ ] | ||
| A. It is good for a big family. B. It is in a city. C. It is in an old building. D. It has a beautiful garden. | ||
| 4. If you want to see the house, how could you see inside of it? | ||
[ ] | ||
| A. Call Jim and he will show you. B. Ask people living there to show you. C. Go there. The door is open. D. You can only see pictures. | ||
| 5. What does it mean if you are "eager" to do something? | ||
[ ] | ||
| A. You are careful doing it. B. You must do it. C. You often do it. D. You want to do it very much. |