Hoà tan hoàn toàn 4,05g nhôm vào 500g dung dịch HCL thu được V (lít) khí (đktc).
a) Tính V
b) Tính nồng độ % của dd axit đã dùng
c) Biết Al = 27 , H =1 , Cl = 35,5
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