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Can someone help plsCalculate the mass in grams of hydrogen chloride produced when 5.6 L of molecular hydrogen measured at STP react with an excess of molecular chlorine gas.

Answers

Answer 1
Answer:

18.22 g of hydrogen chloride produced when 5.6 L of molecular hydrogen measured at STP react with an excess of molecular chlorine gas.

What is STP and how the amount of HCL came out to be 18.22 grams after the reaction?

  1. STP is standard temperature and pressure which is taken into account in the question to compare the value to standardized values.
  2. Here is given 5.6 L of hydrogen measured at STP reacting with an excess of chlorine gas.
  3. According to STP, T = 273 K , P= 1 atm , R = 0.0821L atm/K mol. The equation would be like: H2 + Cl2 = 2HCl .
  4. Now using ideal gas law , PV =nRT , n =PV/RT = 1 x 5.6L/0.0821Latm/K mol x 273 = 0.2498 mol.
  5. Now molar mass of HCl = 0.4996 x 36.485 = 18.22 g . Hence the amount of HCl produced would be 18.22 grams.

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Magnetism is believed to be caused by the alignment of small, numerous sub-units called domains. A magnetic domain is a small portion in the magnetic fields of atoms that have grouped together and aligned uniformly. To best describe domains, they are often likened to tiny random magnets pointing at different directions within a material. When the material is magnetized, these tiny magnets align and point towards a unified direction.

the answer is domains.................

Chemical changes do not form new compounds

do not decompose the old compounds

form new compounds

change the appearance of the old compounds

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The correct answer is that chemical changes form new compounds. Chemical change is a change where the substance changes in identity or form new substances after undergoing a process. On the other hand, a physical change is a change in the properties of matter that does not change the identity of the substance. 

What is the scientific name for the layer of gas that surrounds the Earth

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Which of the following diagrams is the correct electron dot diagram for Ne?

Answers

Answer:

B.

Explanation:

The electron dot diagram which is also known as the Lewis electron dot diagram is a diagram that shows an atom's valence electrons by placing dots, which represent the valence electrons of the element, around the elements symbol

The element for which the electron dot diagram is found = Neon, Ne

The atomic number of neon, Ne = 10

The electronic configuration of neon = 1s²2s²2p⁶

The valence shell is the outermost shell having   the highest value of the coefficient of the orbitals, n = 2s²2p⁶

The number valence electrons in neon = The number of electrons in the valency shell = 2 electrons + 6 electrons = 8 electrons

The number of valence electrons in neon = 8

Therefore, the electron dot diagram for neon will have 8 dots located around the Ne symbol, which gives option B

A compound is formed when 171.2 g of carbon reacts with 28.8 g of hydrogen. What is the mass percent of hydrogen in the compound

Answers

Following the law of conservation of mass, the mass percent of hydrogen in the resulting compound is 14.4%(wt/wt). This is assuming that all of the carbon reacts with all of the hydrogen. The solution is as follows:

mass % = mass hydrogen*100/total mass = 28.8*100/(28.8+171.2) = 14.4%

Answer:

For Edmentum/Plato users, the correct answer is A. 14.4%

Alloys are use to make ballpoint pens, give two reasons why

Answers

Alloys are used because of their strength, resistance to corrosion, appealing appearance and ability to be easily formed.

What is corrosion resistance?

Corrosion resistance: Alloys are resistant to corrosion and rust, which makes them an ideal material for the outer casing of ballpoint pens.

The pen's exterior can be exposed to air and moisture, but the alloy will not corrode or rust, ensuring that the pen remains in good condition for a longer period.

Durability: Alloys are typically stronger and more durable than pure metals, which makes them ideal for use in ballpoint pens.

Ballpoint pens undergo a lot of wear and tear during regular use, such as being dropped, knocked around, or exposed to high temperatures. Using an alloy ensures that the pen will not bend, break, or become deformed easily, which prolongs the life of the pen.

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Alloys are used because of its strength, resistance to corrosion, appealing appearance and ability to be easily formed
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