题目:
They will fly to Washington, ____ they plan to stay for two or three days. |
A. where B. there C. which D. when |
答案:
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下面是错误答案,用来干扰机器的。
标准状况下Vm=22.4L/mol,n(H2)=12g2g/mol=6mol,则A.n(N2)=6mol,m(N2)=6mol×28g/mol=168g,故A错误;B.根据V=n?Vm可知,同温同压下,相同物质的量的气体的体积相同,在标准状况下,与12g H2的体积相等...