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自然界的矿物、岩石的成因和变化受到许多条件的影响。地壳内每加深1km，压强增大约25000~30000 kPa。在地壳内SiO 2 和HF存在以下平衡：SiO 2 (s) +4HF(g) SiF 4 (g)+2H 2 O(g)+148.9 kJ 根据题意完成下列填空： （1）在地壳深处容易有____________气体逸出，在地壳浅处容易有____________沉积。 （2）如果上述反应在体积不变的密闭容器中发生，当反应达到平衡时，____________（选填编号）。 a．2v正(HF)=v逆(H 2 O) b．混合气体的密度保持不变 c．SiO 2 的质量保持不变 d．反应物不再转化为生成物 （3）如果上述反应的平衡常数K值变大，该反应_________（选填编号）。 a．一定向正反应方向移动 b．在平衡移动时正反应速率先增大后减小 c．一定向逆反应方向移动 d．在平衡移动时逆反应速率先减小后增大 （4）若反应的容器容积为2.0L，反应时间8.0 min，容器内气体的密度增大了0.12 g/L，在这段时间内HF的平均反应速率为______________________。
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