Thương Bùi

2 năm trước

ngâm 1 lá kẽm trong 32g dd CuSO4 10% cho tới khi kẽm không thể tan được nữa. a) Viết PTHH b) Phản ứng trên thuộc loại phản ứng gì c) Xác định nồng độ % của dd sau phản ứng

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nguyentransondhy

2 năm trước

Đáp án:

c) C%=10,06%

Giải thích các bước giải:

a) Zn + CuSO4 -> ZnSO4 + Cu

b) Phản ứng trên thuộc loại phản ứng trao đổi.

c) Ta có: mCuSO4=32.10%=3,2 gam -> nCuSO4=3,2/160=0,02 mol

Theo ptpu: nZn phản ứng=nCu sinh ra =nCuSO4=0,02 mol

BTKL: m dung dịch sau phản ứng=m dung dịch ban đầu + mZn phản ứng -m Cu=32+0,02.65-0,02.64=32,02 gam

Dung dịch sau phản ứng chứa ZnSO4 -> nZnSO4=nCuSO4=0,02 mol

-> mZnSO4=0,02.(65+96)=3,22 gam

->C% =3,22/32,02=10,06%

Nhật Dương

2 năm trước

Đáp án:

c) 10,1%

Giải thích các bước giải:

Zn+CuSO4->ZnSO4+Cu

Phản ứng thế

nCuSO4=32x10%/160=0,02(mol)

nZn=nCu=nZnSO4=0,02(mol)

mdd spu=0,02x65+32-0,02x64=32,02(g)

C%ZnSO4=0,02x161/32,02x100%=10,1%

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ngâm 1 lá kẽm trong 32g dd CuSO4 10% cho tới khi kẽm không thể tan được nữa. a) Viết PTHH b) Phản ứng trên thuộc loại phản ứng gì c) Xác định nồng độ % của dd sau phản ứng

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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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ngâm 1 lá kẽm trong 32g dd CuSO4 10% cho tới khi kẽm không thể tan được nữa. a) Viết PTHH b) Phản ứng trên thuộc loại phản ứng gì c) Xác định nồng độ % của dd sau phản ứng

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.

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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.

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