Hòa tan hoàn toàn 5,4g khối lượng M hóa trị 3 trong 200ml dd HCL thu được 6,72 lít H2 ( ĐKC) a) Xác định khối lượng M b) Tính nồng độ mol/ l của dd HCL

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Đáp án m là Al

Giải thích các bước giải: bảo toàn e

Đáp án:

Giải thích các bước giải:

a) nH2 = 6,72/22,4 = 0,3 mol

2M + 6HCl -> 2MCl3 + 3H2

0,2 <--0,6 <----------------0,3 (mol)

=> M kim loại = 5,4 : 0,2 = 27 (Al)

Vậy M là Al

b) Nồng độ mol của dd HCl: CM dd HCl = n/V = 0,6/0,2 = 3M

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