Hòa tan 3,78g Al bằng dd HNO3 loãng dư được dd X và 224ml (đktc) khí N2. Cô cạn dd thu được bao nhiêu gam muối khan?

By Trang Ánh Nam -

Hòa tan 3,78g Al bằng dd HNO3 loãng dư được dd X và 224ml (đktc) khí N2. Cô cạn dd thu được bao nhiêu gam muối khan?

Giải:
Al+HNO3 -->Al(NO3)3  +N2 +??????
2N+5 +10e-->N2o
………0,1….0,01
Al -->Al3+ +3e
0,14……….0,42
Ta thấy số mol e cho chưa bằng số mol e nhận nên còn sản phẩm NH4NO3.
N+5+8e -->N-3.
……0,32…0,04
Vậy tỉ lệ là 4:1
14Al+52HNO3 -->14Al(NO3)3  +1N2 +4NH4NO3+18H2O
0,14………………0,14…………0,01…..0,04
Vậy khối lượng muối là:
m=mAl(NO3)3 +mNH4NO3=0,14.213 + 0,04.80=33,02 gam.



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