Đáp án: điện phân nóng chảy m(g) quặng boxit chứa 80 Al2O3 thì thu được 10,8g AlTính m - Đáp án 25,5 g Giải thích các bước giải 2Al2O3->4Al+3O2 nAl=10,8/27=0,4(mol) =>nAl2O3=0,4/2=0,2(mol) mAl2O3=0,2x102=20,4(g) m quặng=20,4/80%=25,5 g

ductai1932005

2 năm trước

điện phân nóng chảy m(g) quặng boxit chứa 80 Al2O3 thì thu được 10,8g Al.Tính m

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Nhật Dương

2 năm trước

Đáp án:

25,5 g

Giải thích các bước giải:

2Al2O3->4Al+3O2

nAl=10,8/27=0,4(mol)

=>nAl2O3=0,4/2=0,2(mol)

mAl2O3=0,2x102=20,4(g)

m quặng=20,4/80%=25,5 g

Quan Phan

2 năm trước

Đáp án:

M=25,5g

Giải thích các bước giải:đầu tiên hãy tính mAl2O3 rồi tiếp tục tính m quặng Boxit bn sẽ có kết quả trên

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điện phân nóng chảy m(g) quặng boxit chứa 80 Al2O3 thì thu được 10,8g Al.Tính m

2 câu trả lời

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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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điện phân nóng chảy m(g) quặng boxit chứa 80 Al2O3 thì thu được 10,8g Al.Tính m

2 câu trả lời

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

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.

Đề thi - đề kiểm tra Xem thêm

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.