nyujhbuyj

2 năm trước

Hỗn hợp X gồm FeS2 và Cu2S. Hòa tan hoàn toàn m gam hỗn hợp X trong dung dịch HNO3 loãng, kết thúc phản ứng thu được 8,96 lít khí NO duy nhất (đktc) và dung dịch Y (chỉ chứa muối sunfat). Nếu cũng hòa tan m gam hỗn hợp trên bằng dung dịch H2SO4 đặc, nóng thu được V lít (đktc) khí SO2.Tính giá trị của V?

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Nhật Dương

2 năm trước

Đáp án:

13,44 l

Giải thích các bước giải:

nNO=8,96/22,4=0,4(mol)

=> n e nhận=0,4x3=1,2(mol)

Ta có m bằng nhau nên số mol nhường cũng bằng nhau

=>nSO2x2=1,2

=> nSO2=1,2/2=0,6(mol)

VSO2=0,6x22,4=13,44(l)

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