在某温度时，一定量的元素A的氢化物AH3在一定体积密闭容器中可完_爱下问搜题

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问题问答题

在某温度时，一定量的元素A的氢化物AH₃在一定体积密闭容器中可完全分解成两种气态单质，此时密闭容器中气体分子总的物质的量增加了75%．则A单质的一个分子中有______个A原子，AH₃分解反应的化学方程式为______．

答案

设分解后生成A_m，则有2mAH₃

一定温度

.

2A_m+3mH₂，密闭容器中气体分子总的物质的量增加了75%，

则有

2+3m

2m

=1+0.75，

m=4，

可得反应的方程式为4AH₃

一定温度

.

A₄+6H₂↑，

故答案为：4；4AH₃

一定温度

.

A₄+6H₂↑．

完形填空

阅读下面短文，从短文后各题所给的四个选项（A, B, C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
Joe Simpson and Simon Yates were the first people to climb the West Face of the Siula Grande in the Andes mountains. They reached the top_______, but on their way back conditions were very_______. Joe fell and broke his leg. They both knew that if Simon _______ alone, he would probably get back _______. But Simon decided to risk his _______ and try to lower Joe down the mountain on a rope（绳）.
As they_______ down, the weather got worse. Then another _______ occurred. They couldn’t see or hear each other and, _______, Simon lowered his friend over the edge of a precipice（峭壁）. It was _______ for Joe to climb back or for Simon to pull him up. Joe’s _______ was pulling Simon slowly towards the precipice. _______, after more than an hour in the dark and the icy cold, Simon had to _______. In tears, he cut the rope. Joe _______ into a large crevasse（裂缝）in the ice below. He had no food or water and he was in terrible pain. He couldn’t walk, but he_______ to get out of the crevasse and started to _______ towards their camp, nearly ten kilometers _______.
Simon had _______ the camp at the foot of the mountain. He thought that Joe must be _______, but he didn’t want to leave_______. Three days later, in the middle of the night, he heard Joe’s voice. He couldn’t _______ it. Joe was there, a few meters from their tent, still alive.

C．successfully

A．unwillingly

D．regretfully

A．unnecessary

B．take a rest

C．make a decision

B．traveled to

D．returned to

C． immediately

单项选择题

“运费”栏( )

A．502/80/2

B．502/80/3

C．此栏为空

D．80