About two weeks ago, an earthquake ________ 8.6 on the Richter scale struck the coast of Indonesia, leaving residents along coastlines ________ to high ground in panic. A. measuring; fled B. measured; fleeing C. measuring; fleeing D. measured; fled 答案:C
磷在氧气中燃烧,可能生成两种固态氧化物.3.1g的单质磷(P)在3.2g的氧气中燃烧,至反应物耗尽,并放出xkJ的热量.
(1)
通过计算确定反应产物的组成(用化学式表示)是________,其相应的质量为________.
(2)
已知单质磷的燃烧热为ykJ/mol,则1molP与O2反应生成固态P2O3的反应热△H=________.
(3)
写出1molP与O2反应生成固态P2O3的热化学反应方程式:________