nyujhbhu

2 năm trước

cho từ từ 1 luồng khí CO đi qua ống sứ đựng m gam hỗn hợp Fe,FeO,Fe3O4,Fe2O3 thu được 32 gam sắt.Khí đi ra sau phản ứng cho đi qua dung dịch nước vôi tong dư thu được 20 gam kết tủa.Tìm m?

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Quang Cường

2 năm trước

CO+ O -> CO2

CO2+ Ca(OH)2 -> CaCO3+ H2O

nO (bị khử)= nCO= nCO2= nCaCO3= 20/100= 0,2 mol

=> mO(bị khử)= 0,2.16= 3,2g

m oxit= mFe+ mO= 32+ 3,2= 35,2g

Nhật Dương

2 năm trước

Đáp án:

35,2 g

Giải thích các bước giải:

Ta có

nCO2=nCaCO3=20/100=0,2(mol)

=>nCO=0,2(mol)

nO(trong hh)=nCO=0,2(mol)

m=mFe+mO=32+0,2x16=35,2(g)

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Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

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cho từ từ 1 luồng khí CO đi qua ống sứ đựng m gam hỗn hợp Fe,FeO,Fe3O4,Fe2O3 thu được 32 gam sắt.Khí đi ra sau phản ứng cho đi qua dung dịch nước vôi tong dư thu được 20 gam kết tủa.Tìm m?

2 câu trả lời

if you don't wear a helmet , you can't ride your bike => Unless

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