在容积为1L的密闭容器中，充入1 mol N2和4 mol H2，一定条件下反应N2＋3H2 2NH3 达到平衡，此时N2和H2的物质的量之比恰好为 1:5。试回答下列问题：
（1）平衡时混合气体的压强与起始时混合气体的压强相比 （填“偏高”、“偏低”或“相等”）。
（2）该平衡混合气中NH3的体积分数是 。
（3）平衡时，H2的转化率为
（1）偏低（2分） （2）25%（2分） （3）37.5%（2分）
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| Nicola's Love for Her Violin Can love between partners with a 237-year age gap (差距) lead to the perfect match (绝配)? Nicola Benedetti thinks so.The 18-year-old 1 and her partner, a 255-year-old Italian violin, 2 to China for the first time last weekend.She 3 in Beijing on September 15 and also performed in Hangzhou and Shanghai. Nicola is from Scotland and 4 playing the violin when she was four years old. 5 , it was not something her parents 6 her do.She went with her sister to violin lessons and 7 it and improved very quickly. "There are so many different things I am fond of about the 8 ," she said."I can't really 9 it but I love giving live performances, I like the feeling of playing and communicating with the 10 .I love the feeling of the violin under my chin (下巴)." However, playing violin six hours a day is not a/an 11 job."I usually 12 in an upstairs bedroom when I'm at home." she said."But sometimes, when it's 13 outside, it can be upset.The house is right on the 14 and I can see others having fun 15 I'm on my own." Although practising is sometimes lonely, Nicola 16 felt she was lucky."You can't have 17 . I am really lucky to do what I love doing," she said.Her 18 paid off (终有回报).Nicola won BBC Young Musician of the Year in 2004 at 16. 19 her performing and recording activities, Nicola is a/an 20 of UNICEF (联合国儿童基金会). She said that she would travel to Lesotho in southern Africa at the end of this year to help poor kids there. | ||||
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