2018-2022 英语周报 高三 高考 23答案

One possible versionSeveral minutes later, the ice broke suddenly and Harry's feet sank into the water. It was noep, but his legs got wet to the knees. Harry was so upset that the accident would delay hisschedule. He had to find some firewood to build a fire to dry his clothes. He pulled off his glovestook out his matches, and lighted the fire. Seeing the burning fire, he had thought he was safe. Butsuddenly, without warming, a heavy mass of snow dropped down. The flame of hope was put outUnluckily, his dog ran away and the fear of death came over Harry. He had no choice but torun to save himself. However, he did not feel his feet when they hit the ground. Having falleneveral times, he decided to rest a while. As he lay in the snow, he noticed he was not shaking. Hecould not feel his nose or fingers or feet. A feeling of horror came into his mind. It was when herealized he was going to die that he heard a bark and the noise his friends made

19.(12分)(1)4NO2+4N2O4+3O2+6H2O=12HNO(2分)(2)-55.3(2分)(3)6%(2分)2945.3(2分)2分)③H(2分)【解析】(1)NO2和N2O4以物质的量之比1:1与O2和H2O恰好完全反应,化学方程式为4NO2+4N2O4+3O2+6H2O=12HNO3。(2)根据盖斯定律,I×2-Ⅱ得,2NO2(g)N2O4(g)△H=-4.4kJ·mol153.1kJ·mol-1=-55.3kJ·mol-1(3)①设起始时NO2(g)的物质的量为nmol,反应的物质的量为2xmol,根据三段式2NO2(g)=N2O4(g)起始(mol):n0反应(mol):2x平衡(mol):n-2xn2x+x97,解得x=3,NO2的转化率为则2m×100%=6%;平衡时n(NO2)=(n-2×n mmo=47nnoI, n100m,则p(NO2)=97P(NO2)×971Pa,p(N2O)=7×97kPa,Kp=p(N2O)2945.3kPa②B点压强大于E点,压强增大,化学反应速率加快,则v(B)>v(E)。③t2时刻移动活塞压强迅速增大,说明针筒内体积缩小,保持活塞位置木变后,平衡正向移动,混合气氵的物质的量逐渐减小,根据M=m可知,E、F、G、H四点中对应气体的平均相对分子质量最大的点氵为H

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