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2 năm trước

Đốt cháy 7,3 gam hợp chất hữu cơ A thu được 6,72 lít CO2 ở ĐKTC và 4,5g H2O.XĐ công thức phân tử A

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Quang Cường

2 năm trước

nC= nCO2= 6,72/22,4= 0,3 mol => mC= 3,6g

nH= 2nH2O= 2.4,5/18= 0,5 mol => mH= 0,5g

=> mO= 7,3- 3,6- 0,5= 3,2g => nO= 0,2 mol

nC: nH: nO= 0,3: 0,5: 0,2= 3:5:2

=> CTĐGN (C3H5O2)n

Nếu đề bài cho biết M A thì tính đc n

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Đốt cháy 7,3 gam hợp chất hữu cơ A thu được 6,72 lít CO2 ở ĐKTC và 4,5g H2O.XĐ công thức phân tử A

1 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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Đốt cháy 7,3 gam hợp chất hữu cơ A thu được 6,72 lít CO2 ở ĐKTC và 4,5g H2O.XĐ công thức phân tử A

1 câu trả lời

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

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