can someone please solve it it's urgent​

In the given question, [tex]7.949 \times 10^{24}[/tex] atoms are present in 13.2 mole of copper.

A mole is defined as the amount of a substance that contains exactly [tex]6.022\times 10^{23}[/tex] 'elementary entities' of the given substance.

The number of atoms in 13.2 moles of copper (Cu) can be calculated using Avogadro's number.

To calculate the number of atoms in 13.2 moles of copper, we can multiply the number of moles by Avogadro's number:

Number of atoms = [tex]\rm 13.2\ moles\ \times[/tex] [tex]6.022\times 10^{23}[/tex] atoms/mole

Number of atoms = [tex]7.949 \times 10^{24}[/tex] atoms

Therefore, in 13.2 moles of copper, there are approximately [tex]7.949 \times 10^{24}[/tex] atoms.

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Answer: 23 g

Explanation:

Amountafter = Amountbefore * (1/2)^(t/thalf)

Amountafter = (750 grams) * (1/2)^(62.0 hours/12.4 hours)

Amountafter = 23.4375 grams

750 has 2 significant digits

12.4 and 62.0 have 3 significant digits

So we take the lower of 2 significant digits:

23 grams

The half-life of 42K is 12.4 hours. 23.4375 grams of a 750 grams sample left after 62.0 hours.

Half life is the amount of time required to reduce to one-half of its initial value. The symbol of half life is [tex]t_{1/2}[/tex].

It is expressed as:

[tex]N(t) = N_{0} (\frac{1}{2})^{\frac{t}{t_{1/2}}[/tex]

where,

N(t) = quantity remaining

N₀ = initial quantity

t = elapsed time

[tex]t_{1/2}[/tex] = half-life of the substance

Here,

N₀ = 750.0 g

t = 62 hr

[tex]t_{1/2}[/tex] = 12.4

Now put the values in above equation we get

[tex]N(t) = N_{0} (\frac{1}{2})^{\frac{t}{t_{1/2}}[/tex]

[tex]N(t) = 750 \times (\frac{1}{2} )^{\frac{62}{12.4}}[/tex]

[tex]N(t) = 750 \times (\frac{1}{2})^5[/tex]

[tex]N(t) = 750 \times \frac{1}{32}[/tex]

N(t) = 23.4375 grams

Thus, from the above conclusion we can say that the 23.4375 grams of a 750 grams sample left after 62.0 hours.

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Answer:

The chemical elements most likely to form covalent bonds are those that share electrons, such as carbon, as opposed to those that take them from another element to form an ionic bond. In general, they are nonmetals with similar electronegativities.

Explanation:

Answer:a

Explanation:

mass of an atom is concentrated in the nucleus

Answer:c

Explanation:

Answer:

Explanation:

use the equation

moles = mass/mr

=19.9/79.5

=0.250moles of CuO

then do the same for

H = 2.02/1

=2.02

so CuO is the limiting reagent because there is less amount of it.

Hope this helps  :)

Answer:

A

Sn2+ + 2Fe3+ > Sn4+ + Fe2+

Answer:

you have walked 69 steps but your current location is -13

Answer:

Sorry I want to help but I dont know the answer

C is the correct answer

Temperature increases as you gain altitude in the stratosphere and the thermosphere. Temperature increases in altitude within the stratosphere because of the ozone layer.

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Please remember to revise this and make it in your own words if you want! I hope this helps you. -Doodle

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One of the most commonly known catalysed reaction is that of Hydrogen Peroxide turning into Water

In this reaction, we can use Potassium Permanganate (KMnO₄) or Palladium (Pd) as a catalyst.

These catalysts helps Hydrogen Peroxide turn into water and oxygen

Catalyst: Substances that change the rate of a chemical reaction and themselves remain chemically unchanged after the reaction are called catalysts.

Example:- In the process of manufacturing of ammonia Fe is used as Catalyst.

[tex]N _{2} (g)+ 3H _{2} (g) \huge \rightarrow {}^{Fe}\rightarrow \small{3NH _{3}(g)}[/tex]

Note:- there is only one arrow. I was unable to put iron over the arrow ..

Answer:

don't no answer

Explanation:

d don't no answer

Answer:

solid state...........

Answer:

an anion

Explanation:

since it lost a proton..it now has 3 protons and four electrons and possesses a minus charge since it is no longer neutrally charged..this minus charge makes it an anion

Answer:

has very different properties from sodium and chlorine

Explanation:

We know that salt (chemical name: Sodium Chloride) is made from two elements, Sodium (Na) and Chlorine (Cl). But the properties of the compound of sodium and chlorine has completely different properties than those of its elements: Sodium and Chlorine.

Sodium is quite a low density but highly reactive silvery white metal and Chlorine is a highly reactive greenish yellow gas. While salt (NaCl) is a crystalline material, white in color, which readily dissolves in water and is used as a condiment to add flavor to food.

plz mark me as a brainlest

Answer: B) It presents the correct sequence of events in Earth’s history.

Explanation: edge 2021

Answer:

I dont know

Explanation:

I need it to

Answer:

The correct answer is - 62.36 g.

Explanation:

Given:

Mass of substance - 200

decreasing rate - 11% per day

mass at the beginning of the 10th day - ?

Solution:

F(x) = 200*(1 - 11)^x

here x the time

F(x) = 200* (0.89)^10

= 200*0.3118

= 62.3634

Thus, the correct answer is 62.36 g.

Answer:

UV filter cream

I will be hydrated and keep a wet cloth over my head

I do not live in Philippines

Answer:

1. Sunglasses protect my eyes from UV rays and reduce the risk of cataracts. They also protect the tender skin around your eyes from sun exposure. Sunglasses that block both UVA and UVB rays offer the best protection. Wrap-around sunglasses work best because they block UV rays from entering on the side.

2. Block out the sun at home during the day by closing curtains and blinds. Open the windows when there is a cool breeze. Stay out of the sun during the hottest part of the day. If you do have to go outside, wear a hat and sunscreen, and seek shade.

3. the Philippines enjoys a tropical climate that is for the most part hot and humid year-round, but can be roughly divided into a dry season between November and May, and a wet season between June and October. Although in recent years, due to climate change, summers have been extending into June and July.

Answer:

The molar mass and molecular weight of 3CaCl2 is 332.952. 

It takes 10 years for the substance z to decay from 48g to 3g

Half life of z = 2.5 years

Final amount of Z = 3 g

Initial amount of Z = 48 g

According to the question, it takes 2.5 years for substance Z to reduce to half.

So,

In 2.5 years, the amount of z = 48/2 = 24 grams

In next 2.5 years, the amount of z = 24/2=12g

In next 2.5 years, the amount of z = 12/2=6g

In next 2.5 years, the amount of z = 6/2=3g

To reduce the amount from 48g to 3g, total years = 2.5 + 2.5 + 2.5 + 2.5

= 10 years

Therefore, it takes 10 years for the substance z to decay from 48g to 3g

Answer:

65.21 percent

Explanation:

We are to find the percentage yield

We have this equation,

2no+o2 -->2no2

Such that 1500 kilograms/30grams

= Mno2/46

=1500/30 = mno2/46

We cross multiply from here

1500x46 = 30xMnO2

69000 = 30Mno2

69000/30 = MnO2

2300 = Mno2

The percentage yield would be

1500/2300 *100

= 0.6521 x 100

= 65.21%

This answers the question

Answer:

Number of neutrons

Explanation:

The mass number represents the number of protons and neutrons combined and the atomic number only represents the number of protons.

mass number - atomic number = number of neutrons

Answer:

mass number - atomic number = number of neutrons

Explanation:

The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. The mass number minus the atomic number represent the number of neutrons.

Answer:

43.2 moles of carbon dioxide are required and 421g of glucose could be produced

Explanation:

Based on the reaction:

6CO2 + 6H2O → C6H12O6 + 6O2

1 mole of glucose, C6H12O6, requires 6 moles of carbon dioxide. 7.2moles of glucose requires:

7.2mol C6H12O6 * (6mol CO2 / 1mol C6H12O6) =

618g of CO2 -Molar mass: 44.01g/mol- are:

618g * (1mol / 44.01g) = 14.04moles CO2

Moles C6H12O6:

14.04moles CO2 * (1mol C6H12O6 / 6mol CO2) = 2.34moles C6H12O6

Mass glucose -Molar mass: 180.156g/mol-

2.34moles C6H12O6 * (180.156g / mol) =

Answer:

C3H6

Explanation:

Among all the given option, the correct option is option 4. The formula of given chemical compound is C[tex]_3[/tex]H[tex]_6[/tex].

The chemical symbols make up the molecular formula. Additionally, it includes a list of the molecule's constituent elements as well as numeric subscripts that indicate the number of atoms in each element. It is a method of displaying data on the chemical ratios.

The chemical formula has no words and does not have a chemical name. A formula is not the same as a complete chemical molecular formula, despite the fact that it may suggest certain basic chemical structures. The formula of given chemical compound is C[tex]_3[/tex]H[tex]_6[/tex]. First, determine the molar mass formula. Then, divide the compound's molar mass by the expression for molar mass.

Therefore, the correct option is option 4.

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Answer: I think 5

Explanation:

Balanced equations use the whole numbers to conserve the atomic numbers. When the reaction is balanced then 2 will be the coefficient in front of the Ag⁺.

A balanced reaction has symbols and whole numbers that represent the number of atoms and molecules of the reactants and the products in a reaction mixture.

The reaction between mercury and silver is shown as:

Hg + 2Ag⁺ → 2Ag + Hg²⁺

This can be checked by the redox half-reactions as:

2Ag⁺ + 2e⁻  →  2Ag⁰

Hg⁰  → Hg²⁺ + 2e⁻

Therefore, the silver cation gained two-electron and became a silver atom.

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Answer:

CaCl2

Explanation:

Answer:

The answer is C. 40.0 mL.

Explanation:

To solve for the volume of KOH, start by using the formula [tex]N_{B}[/tex][tex]V_{B}[/tex] = [tex]N_{A}[/tex][tex]V_{A}[/tex] and label the information given in the question. The B in the formula stands for the base solution, and the A in the formula stands for the acid solution.

[tex]N_{B}[/tex] = 0.050 M KOH

[tex]V_{B}[/tex] =   ?    

[tex]N_{A}[/tex] = 0.0100 M HNO3

[tex]V_{A}[/tex] = 200. mL  

Next, use the formula [tex]N_{B} V_{B} = N_{A}V_{A}[/tex], and in order to find the volume for the base solution, the formula will have to be derived for [tex]V_{B}[/tex]. The formula will now look like [tex]V_{B}= \frac{N_{A} V_{A} }{N_{B} }[/tex].

Then, plug in the information given in the question. The equation will look like [tex]V_{B}= \frac{(0.0100 M HNO_{3} {})(200. mL) }{0.050 M KOH}[/tex]. Finally, solve the equation, and the answer will be 40.0 mL.