题目大意： 6g 镁与过量的盐酸反应生成多少体积的氢气
6g镁为0.25 mol
根据反应式1 mol镁生成1 mol氢气
0.25 mol镁就生成0.25 mol氢气
在标准状况下,1 mol任何气体所占的体积都约为22.4 L,0.25 mol氢气为5.6L
所以选B
magnesium reacts with hydrochloric acid.
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