write a short passage about one of your past weekends是什么意思

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• Write a short passage about one of your past weekends.The following questions may help you.
• write a short passage about one of your past weekends是什么意思
• 某混合气体中各气体的质量分数为O2 32%,N2 28%,CO2 22%,CH4 16%,H2 2%,则此混合气体对氢气的相对密度?某混合气体中各气体的质量分数为O2 32%,N2 28%,CO2 22%,CH4 16%,H2 2%,则混合气体对氢气的相对密度为：A.32.00 B.11.11 C.22.22 D.30.00 假设有100克气体,则气体的总物质的量为：32/32+28/28+22/44+16/16+2/2=4.5mol则混合气体的摩尔质量＝100/4.5g/mol混合气体对氢气的相对密度为：100/(4.5*2)=100/9=11.11B 是对的.为什么CO2 是22/44,也就是为什么是0.5mol?
• 将N2和H2按一定比例混合，在相同状况下其密度是H2的3.6倍，取出0.5mol该混合气体充入密闭容器里，使之发生反应并在一定条件下达到平衡，已知反应达平衡后容器内压强是相同条件下反应前压强的0.76倍，试求：（1）反应前混合气体中N2和H2的体积比；（2）达到平衡时混合气体中N2的物质的量；（3）平衡时N2的转化率．