Cao Trần Gia Hân

2 năm trước

Cho 100 gam dung dịch Na2CO3 x% vào 200 gam dung dịch HCl 7,3% vừa đủ sau phản ứng hoàn toàn thu được dung dịch A và khí B a.Viết phương trình của phản ứng, xác định khí B và chất tan trong dung dịch A b.tính x% =? của dung dịch Na2CO3 phản ứng Mọi người giúp em để mai em thi học kì nha :<

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giangnth

2 năm trước

Đáp án:

Giải thích các bước giải:

Đặng Văn Chước

2 năm trước

Đáp án:nHCl=(200.7,3%):36.5

n Na2CO3=1:2 nHCl=>x%=nNa2CO3 nhân 100

Chất tạo ra là nacl, h2o,co2

Giải thích các bước giải:

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1) Nước đá khớp được làm từ gì ? Tại sao nó có thể tạo hơi lạnh được như đá khô ?
2) Vì sao khi mở bình nước ngọt có ga lại có nhiều bọt khí thoát ra ?
3) Tại sao CO2 được dùng để dập tắt các đám cháy ?
~GIÚP MÌNH MẤY CÂU NÀY NHAA
🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏

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

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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.

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