Nhôm tác dụng với dung dịch axit clohiđric (HCl) theo sơ đồ sau: Nhôm + axit clohiđric -----> nhôm clorua (AlCl 3 ) + khí hiđro. Khi cho miếng nhôm tan hết vào dung dịch HCl có chưa 0,2 mol thì sinh ra 1,12 lít khí hiđro(đktc). a, Tính khối lượng miếng nhôm đã phản ứng. b, Axit clohđric còn dư hay không? Nếu còn dư thì khối lượng là bao nhiêu?

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