题目:
第二节:开放作文(15分)
请根据下面提示,写一篇短文。词数不少于50。
In your English class, your teacher shows you the following picture. You are asked to describe the picture and explain how you understand it.
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:根据反应的化学方程式为:N2+3H22NH3可得 :V(H2):V(NH3 )="3:2" 。V(NH3 )=(2∕3)V(H2)= (2∕3)×0.45mol/(L·s)="0.30" mol/(L·s)。所以2s末NH3的浓度为:C(NH3)="Δt" ·V(NH3 )="2s×=0.30" mol/(L·s)="0.60" mol/L。选项为:B。