某温度时，在一个2L的密闭容器中，X、Y、Z三种物质的物质的量随时间的变化曲线如图所示。根据图中数据填空
（1）该反应的化学方程式为________________。
（2）反应开始至2min，以气体Z表示的平均反应速率为________________。
（3）若X、Y、Z均为气体，2min后反应达到平衡，反应达平衡时：
①此时体系的压强是开始时的__________倍；
②达平衡时，容器内混合气体的平均相对分子质量比起始投料时____________（填“增大”“减小”或“相等”）。
（1）3X+Y
2Z
（2）0.05mol/(L·min)
（3）0.9；增大
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| I'll never forget one summer day in 1975. On that day my 1 suddenly died because of an unexplained illness at the age of 36. Later that afternoon, a police officer 2 to my house to ask for my father's permission (允许) for the hospital to 3 mother's valve (心脏瓣膜). I was greatly sur-prised. I ran into the house in tears. At 14 I just couldn't understand why people would take apart (分解) a person I 4 . 5 my father told him, "Yes." "How can you let them do that to her?" I 6 him. " Linda," he said 7 , putting his arms around me, "the greatest present you can give is a part of 8 . Your mother and I decided long ago that if we can make a person's life 9 after we die, our death will have meaning." The lesson my father taught me that day became one of the most 10 in my life. Years passed. I married and had a family 11 my own. In 1996 my father became seriously ill. With a smile he told me that when he died, he wanted to donate (捐赠) 12 was in good condition (状况), especially his eyes. My father died and we donated 13 as he had wanted. Three days later, my daughter said, "Mum, I'm so 14 of what you did for Grandpa." At that moment I realized that my father gave 15 his eyes. What he left behind sparkled (闪烁) in my daughter's eyes-pride. | ||||
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