Someone please help me with question 4 ! EXTRA POINTS

Answer:

3.45 moles Li  contains  2.08 × 10 (to the power of)24  atoms .

Explanation:

The relationship between atoms and moles is:

1  mole atoms =

6.022 × 10 (to the power of)23

atoms

In order to determine how many atoms occupy a given number of moles, multiply the given moles by  

6.022 × 10 (to the power of)23

atoms/mole

.

In the case of 3.45 moles lithium (Li):

3.45 mol Li × 6.022 × 10 (to the power of)23  atoms Li/ 1 mol Li =

2.08 × 10 (to the power of)24

atoms Li  rounded to three

Answer: 3.45 moles Li contains 2.08 × 10 (to the power of)24 atoms

Explanation:

A) The number of moles of CO₂(g) present in the vessel at equilibrium is; 1.04 moles

B)  The expression for Kp, the equilibrium constant for the reaction, and its value at 898°C is; Kp = (P[CO₂] * P[CaO])/(P[CaCO₃]) and Kp = 0.0104 mol/L

We are given the reaction equation as;

CaCO₃ (s) ⇄ CaO (s) + CO₂(g)

We are given;

Number of moles of CaCO₃ used = 2 mols

Volume of vessel; V = 100 L

Temperature; T = 898°C = 1171 K

Pressure of CO₂ in the vessel; P = 1 atm

A) Formula for number of moles of CO₂ in the vessel at equilibrium is;

n = PV/RT

where;

P is Pressure

V is Volume

R is gas constant = 0.08206 L·atm/mol·k

n = (1 * 100)/(0.08206 * 1171)

n = 1.04 moles of CO₂

B) Formula to find the equilibrium constant kp is;

Kp = (P[CO₂] * P[CaO])/(P[CaCO₃])

Where;

P[CO₂] is the partial pressure of CO₂

P[CaO] is the partial pressure of CaO

P[CaCO₃] is the partial pressure of CaCO₃

Since concentration of solids is taken as 1, then it means that;

Kp = P[CO₂]

Kp = 1.04/100

Kp = 0.0104 mol/L

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If 28.0 grams of N2 and 5.04 grams of H2 are reacted, producing 17.8 grams of NH3. the percent yield is 52.4%. Therefore, the answer is option 3,

To calculate the percent yield, we first need to calculate the theoretical yield of NH3 based on the amounts of N2 and H2 that were reacted.

The balanced chemical equation for the reaction is:

N2 + 3H2 → 2NH3

From the equation, we can see that 1 mole of N2 reacts with 3 moles of H2 to produce 2 moles of NH3. Therefore, the moles of N2 and H2 reacted can be calculated as:

moles of N2 = mass of N2 / molar mass of N2

= 28.0 g / 28.014 g/mol

= 0.999 mol

moles of H2 = mass of H2 / molar mass of H2

= 5.04 g / 2.016 g/mol

= 2.5 mol

Since N2 is the limiting reactant (its mole value is less than H2's mole value), we can calculate the amount of NH3 produced based on the mole ratio of N2 and NH3:

moles of NH3 = 2/1 x moles of N2

= 2/1 x 0.999 mol

= 1.998 mol

The theoretical yield of NH3 can be calculated from its mole value:

mass of NH3 = moles of NH3 x molar mass of NH3

= 1.998 mol x 17.031 g/mol

= 34.06 g

Now, we can calculate the percent yield by dividing the actual yield (17.8 g) by the theoretical yield (34.06 g) and multiplying by 100:

percent yield = actual yield / theoretical yield x 100%

= 17.8 g / 34.06 g x 100%

= 52.24%

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Answer:

41.67 ml HCl

Explanation:

n = M x V

Since the number of moles is the same:

M1 x V1 = M2 x V2

V1 = M2 x V2 /M1 =(0.1 L x 5.0 M) / 12.0 M = 0.041667 L = 41.67 ml

Answer:

B

Explanation:

well heterogenous mixtures are not uniformly distributed these meaning whatever components are "mixed" can be seperated easily

a example of this can be

Soil, oil in water, ice in water

while Homogeneous mixture cannot be seen seperated

Answer: B. Its components are unevenly distributed.

Explanation:

Answer:

The wavelength of this light is 780.4 nm.

Explanation:

Given that,

The frequency of laser light, [tex]f=3.844 \times 10^{14}\ Hz[/tex]

We need to find the wavelength of this light.

We know that,

[tex]c=f\lambda[/tex]

Where

[tex]\lambda[/tex] is the wavelength of light

So,

[tex]\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{3.844 \times 10^{14}}\\\\=7.804\times 10^{-7}\ m\\\\=780.4\ nm[/tex]

So, the wavelength of this light is 780.4 nm.

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, cobalt has larger atomic radius than nickel.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

On going down the group of periodic table size increases due to increase in number of shells, on going from left to right in a period the size decreases because of increase in effective nuclear charge. Cobalt or nickel comes in the same period, cobalt comes first to nickel. Cobalt has larger atomic radius than nickel. Ni and Co belongs to d block.

Therefore, cobalt has larger atomic radius than nickel.

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Answer:

7

Explanation:

Bec g1 has to lose one electron and g7 has to gain one electron

Answer:

10 μg or 1 x 10⁻⁵ g

Explanation:

The concentration of lead ion is given in parts by billion (ppb), which means that there are 5 micrograms (μg) of lead in 1 liter of water sample:

5 ppb = 5 μg lead ion/L

If we assume that the density of the water sample is equal to 1 g/ml (density of water at 25°C), we can say that 2000 g of sample is equal to 2000 mL:

sample volume = 2000 g x 1 mL/g = 2000 mL x 1 L/1000 mL = 2 L

Thus, the amount of lead ion in 2000 g (or 2 L) of water sample is:

mass of lead ion = 5 μg lead/L x 2 L = 10 μg x 1 g/10⁶μg = 1 x 10⁻⁵ g

Answer:

Elements are distinguished from one another by their atomic numbers. No two elements have the same atomic number. It is the atomic number, and therefore the number of protons in its atomic nuclei, that define an element.

Answer:

11 grams

Explanation:

your welcome!!!!!

Answer:

Cells produced by meiosis are genetically identical, and cells produced by mitosis are genetically unique.

Explanation:

Cells produced by mitosis possess half the genetic material of cells produced by meiosis. Mitosis only occurs in the presence of oxygen, while meiosis can occur in the absence of oxygen.

Answer:

C

Explanation:

Answer:

hi 7676

jkjk jj

67 jyrf

876

Answer:

miss you baby talk tm

Explanation:

Answer: C is the definete awnser so yeah its just a lol of REHEHEHEHHEHEHEHEHEHEHEHEHEHEHHEHEHEHEHEHEHEHEHHEHEHEHEHHEHEHEHEHEHEHEHEHHEHEHEHEHEHEHEHEHEHEHEHHE

Answer: I think its C or B

Explanation: Hope this was helpful....

Answer:

If there is no subscript written after a symbol that means there is one atom of that element present

Explanation:

correct me if I'm

If there is no subscript on an element's chemical  symbol there is one atom of that element.

It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.Elements combine to form compounds.

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Answer:

silicon

Explanation:

Silicon is at a higher level than germanium, tin, and lead.

Most semiconductors are made up of silicon. Thus, the correct option for this question is D.

A Semiconductor may be defined as a type of solid substance that possesses an electrical conductivity between that of an insulator and a conductor. It has a specific electrical property that allows it to function as a foundation for computers and other electronic devices.

Silicon is the most widely utilized in the manufacturing of semiconductors. Apart from this, germanium, gallium, and arsenide are also used. Among all these elements, germanium was one of the earliest semiconductors material used.

Semiconductors are widely used in the production of Integrated circuits (ICs) and electronic discrete components such as diodes and transistors.

Therefore, most semiconductors are made up of silicon. Thus, the correct option for this question is D.

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Answer:

i did but i didn't see anything

Explanation:

Answer: Replacement means a person or thing that takes the place of another; a substitute.

I think its d but im not sure

Answer:

Below

Explanation:

The answer is C, because ecosystems include:

Competition

Predation

Consumption

Parasitism

Disease

Symbiosis

In evolutionary theory, adaptation is the biological mechanism by which organisms adjust to new environments or to changes in their current environment.

Answer:

adaptation is the biological mechanism by which organisms adjust to new environments or to changes in their current environment. .

Explanation:

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1.02 moles of NaCl are present in 60 grams sample of NaCl (sodium chloride).

Moles of any substance is calculated as:

n = W/M, where

W = given mass of NaCl = 60 grams (given)

M = molar mass of NaCl = 58.44 g/mole

On putting these values in the above equation, we get

n = 60 / 58.44 = 1.02 moles

Hence, 1.02 moles are present.

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Answer:

m = 21.915 g of NaC to create the right balance between

The number of moles of NaCl is 1.31 moles. This can be calculated by using the molarity formula i.e. M=n/V.

Molarity is defined as the ratio of the number of moles of solute to the Volume of solution in liters.

It is given by:

M = n/V

What information do we have?

Volume = 5.25 L

Molarity = 0.25 M

To find:

Moles=?

On substituting the values:

M=n/V

0.25 M =n/ 5.25 L

n= 0.25M*5.25 L

n=1.31 moles

Thus, the number of moles of NaCl are 1.31 moles.

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Answer:

To be stable an atom will gain, lose, or share electrons to complete the outer most energy level (electron shell). Octet Rule because levels 2 and 3 need 8 electrons to be stable.

Answer:

C

Explanation:

Answer:

Continental is thicker than oceanic crust

Explanation:

oceanic crust is typically 40km thick and continental is between 150km and 200km thick

Answer:

hope this help !

Explanation:

Use the given functions to set up and simplify 173 ° C .

1.5 =

CH4 = CH4

4.4 = CH4

173 ° C = CH4