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Galina-37 [17]
3 years ago
7

How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP?? PLEASE HELP

Chemistry
2 answers:
-BARSIC- [3]3 years ago
6 0
9.0 grams will produce 11 L of hydrogen
lys-0071 [83]3 years ago
5 0

Answer:

8.8

Explanation:

You can view more details on each measurement unit: molecular weight of Aluminum or grams The molecular formula for Aluminum is Al. The SI base unit for the amount of substance is the mole. 1 mole is equal to 1 mole of Aluminum.

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Cho 4g CuO vào dung dịch axit clohidric 10% thì phản ứng vừa đủ.
Sholpan [36]

Answer:

Explanation:

a. CuO+ 2HCl⇒CuCl2+ H2O

b. n_{CuO}= \frac{4}{80}= 0,05 (mol)

⇒n_{CuCl2}= n_{CuO}=0,05 mol

⇒m_{CuCl2}= 0,05×135=6,75 (g)

c. n_{HCl}=2× n_{CuO}=0,1 (mol)

⇒m_{HCl}= 0,1×36,5= 3,65 (g)

⇒m_{dd HCl}= \frac{m_{HCl}}{10}×100=36,5 (g)

⇒ Nồng độ phần trăm dd sau phản ứng= Nồng độ % dd CuCl2=\frac{m_{CuCl2} }{m_{dd HCl+ m_{CuO} } }×100=\frac{6,75}{36,5+4} ×100≈ 16,67%

8 0
3 years ago
What is the difference between a substance and mixture ?
snow_lady [41]

Explanation:

Matter can be categorized into substances and mixtures.

Matter is anything that has mass and occupies spaces.

Substances are distinct matter with the following properties:

  • All parts are the same throughout i.e homogeneous
  • Their composition is definite
  • They cannot be easily separated or broken down into simpler substances by physical means
  • Separation by physical means is not easy
  • They have a unique set of physical properties.

Mixtures have the following properties:

  • Their composition is indefinite i.e they consist of two or more elements and/or compounds in any proportion by mass
  • Their constituents retains their identity
  • They can easily be separated by physical means
  • They have a broad range of physical properties.

Learn more:

Mixtures brainly.com/question/1446244

#learnwithBrainly

6 0
3 years ago
Two or more elements chemically joined form what?
7nadin3 [17]

Answer:

compound

Explanation:

When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound. Most elements on Earth bond with other elements to form chemical compounds, such as sodium (Na) and Chloride (Cl), which combine to form table salt (NaCl).

3 0
3 years ago
Read 2 more answers
What particles gives the nucleus its positive charge
Flauer [41]

Answer:

Protons

Explanation:

your welcome!

6 0
3 years ago
Number of atoms in calcium carbonate
lakkis [162]

Answer:

5 Atoms

Explanation

We have one atom of Calcium, One Atom of Carbon and three of Oxygen

3 0
3 years ago
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