Most of the food that organisms eat can be traced back to? .

A. plants
B. soil
C. animals
D. bacteria

The number of moles for the quanity 8.06 x\(10_{21\) atoms of Pt​ is approximately 2.61 grams.

To calculate the number of moles for a given quantity of atoms, we can use Avogadro's number and the molar mass of the element. Avogadro's number is 6.022 x 10²³ atoms/mol.

In this case, you have 8.06 x 10²¹ atoms of Pt. To find the number of moles, divide this quantity by Avogadro's number:

8.06 x 10²¹  atoms Pt / 6.022 x 10²³  atoms/mol = 0.0134 mol Pt

So, there are approximately 0.0134 moles of Pt in 8.06 x 10²¹  atoms of Pt.

The molar mass of Pt (platinum) is 195.08 g/mol. To convert the number of moles to grams, multiply the number of moles by the molar mass:

0.0134 mol Pt x 195.08 g/mol = 2.61 g Pt

Therefore, there are approximately 2.61 grams of Pt in 8.06 x10²¹  atoms of Pt.

In summary, the number of moles for the quantity 8.06 x 10²¹ atoms of Pt is approximately 0.0134 moles. This is equivalent to approximately 2.61 grams of Pt. Remember to use Avogadro's number and the molar mass to perform these calculations accurately.

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Answer:

The electron e^- is found outside the nucleus hope this helps. the proton and the neutron is found inside the nucleus leaving only the electron

Answer:

2.1 x 10^24

Explanation:

The number of atoms in a mole will always be the same. The fact that it's lithium is completely irrelevant.

One mole of anything is 6.022 x 10^23 atoms

So if we need to find the number of atoms in 3.5 mol we just need to multiply Avogadro's number by 3.5

3.5 x 6.022 x 10^23

= 21.077 x 10^23

To make it proper scientific notation the first number can't be greater than 10 so let's move the decimal place and increase the exponent

2.1077 x 10^24

Remove the numbers that aren't significant figures

2.1 x 10^24

Boom there's your answer

Answer:

No

Explanation:

No

Answer:

Answer:

B. It's dissociation is a reversible reaction

Explanation:

NH3 is a weak alkali that does not dissociate fully into its solution. Only parts of the ammonia takes part in the dissociation process.

NH3 + H20 —> NH4+ + OH-

This dissociation is reversible which means the reactants can be formed from the product gotten from the dissociation

It has a high pH due to its basic nature. It also has a Low concentration of H+ ions and not all the OH- ions are released.

Answer:

1,095 x 2= $2,190

year= 365 days  

day= 1 day  

1 day = $2.00

i knew that 1 year was 365 I so i did 365x3 to get 1,095 x 2 to get how much i would spent in 3 years to get 2,190

Explanation:

cool

Answer:

3

Explanation:

the three elements involved in this compound are Li, S, O.

lithium, sulfur, and oxygen. Which create the ionic compound, "Lithium Sulfate."

7 atoms total, since there are two lithium, four oxygen, and one sulfate atom. this is a white inorganic salt.

There are three different types of elements in LiSO₄ which are lithium (Li), sulfur (S), and oxygen (O).

An element is a pure substance made of only one kind of atom which all have the same number of protons in their nuclei.

The chemical element was first presented by Robert Boyle who defined it as "incapable of decomposition”. Boyle’s this definition lies admirably close to present-day theory.

When different kinds of elements undergo particular chemical reactions then atoms are rearranged into new compounds connected together by chemical bonds.

All other naturally occurring elements occur on the Earth as compounds or mixtures. Air is a mixture of the elements nitrogen (N₂), oxygen (O), and argon (Ar), though it does contain carbon dioxide and water.

Given compound, lithium sulfate is formed of LiSO₄ has elements lithium, sulfur, and oxygen.

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Answer:

1) takes the shape of its container ( liquid and gas).

2) fills all available space (gas)

3) maintains its shape ( solid)

4) can be poured ( liquid)

5) is compressible ( gas)

6) has a fixed volume ( liquid and solid)

Explanation:

Matter is simply defined as anything that has weight and occupies space. It exists in three states, namely: solid, liquid and gaseous states.

The properties of different states of matter includes:

SOLID STATE

--> It has a definite shape: The shape of a solid is fixed; it does not depend on the shape of other materials.

--> It has a definite volume: it occupies its own shape due to the force of cohesion among its molecules.

--> It is tightly packed: The molecular movements of particles are negligible.

LIQUID STATE

--> liquid has a defined volume.

--> it has no definite shape: There is no specific shape of a liquid. It occupies any available space. It's shape depends on the shape of the container into which it is poured.

GASEOUS STATE

--> it has no fixed shape: Due to the distance in the molecules of gas, the gaseous state has no shape. It occupies the shape of its container.

--> It has no fixed volume: it occupies the shape of any container that is closed.

--> It is highly compressible: The particles of gas are far off from one another and there is room for collision.

Covalent bonding involving covalent bonds is depicted between these two atoms as they form diatomic molecule.

Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.

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Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore 26.55g of iron is needed to completely consume 18.5L chlorine gas at 25 degree Celsius and 1 atm pressure.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of chlorine gas =1 atm

V= volume of chlorine gas =18.5L

n =number of moles of chlorine gas

T =temperature of chlorine gas =298K

R = Gas constant = 0.0821 L.atm/K.mol

1 atm×18.5L= 0.0821×n×298K

1 atm×18.5L=n×24.4

n=0.75mol

mass of chlorine=0.75mol×35.453 g/mol

                          =26.55g

Therefore 26.55g of iron is needed to completely consume 18.5L chlorine gas at 25 degree Celsius and 1 atm pressure.

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The section that represents the phase of water with the highest kinetic energy is the gas phase or vapor phase.

Gas phase or vapor phase section is above the boiling point curve, which separates the liquid and gas phases. At this point, the temperature is at or above 100°C (at standard atmospheric pressure), and the kinetic energy of the water molecules is sufficient to overcome the intermolecular forces holding them in the liquid phase and escape into the gas phase. The gas phase has the highest kinetic energy because the water molecules in this phase are more widely separated and move more rapidly than in the liquid or solid phases. The gas phase is also characterized by the highest entropy or disorder, as the molecules are free to move in any direction and occupy a large volume. The section that represents the phase of water with the highest kinetic energy is  gas phase or vapor phase.

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Answer:

CO2 AND H20 I THINK IM 99 PERCENT SURE

Molar volume of hydrogen gas is because 'some bubbles of hydrogen gas remained clinging to the sides of the tube'

The volume occupied by 1 mole of the molecules of a gas at STP i.e. standard temperature and pressure

Here if liquid is not vaporized completely then bubbles of hydrogen gas remained clinging to the sides of the tube and then the condensed vapor in the flask contains the air which is initially occupied before the liquid is heated and when calculating the molar mass of the vapor the moles of air which are initially present are not excluded, so that the molar mass of the vapor would be increase in large value

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Answer:

false, Hydrogen is the simplist

Hydrogen is the simplest element; its atom consists of only one proton and one electron

\(CuCl_2+2NaNO_3 \rightarrow Cu(NO_3)_2 + 2NaCl\)

Answer:

a because it help in protecting disease

Answer:

1. Exothermic.

2. -1598 kJ.

Explanation:

Hello!

1. In this case, according to the reaction, we can infer that 799 kJ of energy are evolved (given off, released) it means that the enthalpy of reaction is negative as the reactants have more energy than the products; which means this is an exothermic reaction.

2. Here, as we know that the enthalpy of reaction is -799 kJ/mol, we can compute the q-value as shown below, considering the reacted 2 moles of solid iron:

\(q=2mol*-799 kJ/mol\\\\q=-1598kJ\)

Which means that 1598 kJ of energy are evolved when 2 moles of solid iron react.

Best regards!

Answer:

Explanation:

Half life T is 432 years .

432 years = 432 x 365 x 24 x 60 x 60 s

= 1.36 x 10¹⁰ s .

No of atoms in 5.54 g of sample of Am N= 6.02 x 10²³ x 5.54 / 241

N = 138.38 x 10²⁰ atoms .

disintegration constant λ = .693 / half life

λ =  .693 / 1.36 x 10¹⁰ s .

= .51 x 10⁻¹⁰ .

dN / dt = λN

= .51 x 10⁻¹⁰  x  138.38 x 10²⁰

= 70.57 x 10¹⁰ per second.

No of particles emitted = no of disintegration per second

No of particles emitted =  70.57 x 10¹⁰ per second.

MgSO4 + Na3PO4 = Na2SO4 + Mg3(PO4)2

Answer: The products of Na3PO4 + MgSO4 are Na2SO4 + Mg3(PO4)2

Explanation:

Answer:

\(SnS_{2}\)

Explanation:

The formula for tin(IV) sulfide is SnS\(_{2}\)

The specific heat of the metal is 1.1106 J/g°C

Specific heat is the quantity of heat required to raise the temperature of one gram of a substance by one celsius degree

Here given data is

Mass of unknown metal = 23.8g

Temprature = 100°C

Mass of water = 50.0cm³ = 50 g

Temprature of water =  24.0°C

Final temprature of the system = 32.5°C

We have to find specific heat = ?

So first we determine the heat gain by water

Specific heat of water is 4.18 J/g°C

Q = mcΔT

Q =  50 g×8.5°C×4.18 J/g°C

Q = 1776.5 Joules

Then we determine the total heat lost by the unknown metal

Taking the specific heat f the metal to be x

Heat = 23.8g×67.5°C×x

1776.5 Joules = 23.8g×67.5°C×x

1776.5 Joules = 1606.5 J

x =  1606.5 J/1776.5 Joule

x = 1.1106 J/g°C

Specific heat of the metal is  1.1106 J/g°C

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The change in volume of the system if 325 J of work is done by a system is -3.21L.

To calculate how much work a gas has done (or has done to it) against a constant external pressure, the following formula is used;

W = -P × ∆V

Where;

According to this question, if 325 J of work is done by a system at a pressure of 1.0 atm and 298 K. The change in volume can be calculated as follows:

325J is equivalent to 325/101.325 = 3.21L/atm

3.21 = -1 × ∆V

3.21 = -∆V

∆V = -3.21L

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Answer:

think I did this before and its V

find the given attachment

N₂0₄ is the formula represents the binary molecular compound dinitrogen tetroxide. Therefore, option B is correct.

Binary molecular compounds are made up of exactly two nonmetal elements. HF, NO2, and P2O5 are a few examples. It is extremely simple to name binary molecular compounds. The first element is given its element name, followed by ide; the second element is given its root (hydr, bor, carb, ox, fluor, etc.).

In N₂0₄ molecule there are two nitrogen atoms at the suffix so, it is binary and in oxygen atom its suffix is 4 so, it is tetroxide. Therefore, N₂0₄ is the formula represents the binary molecular compound dinitrogen tetroxide.

Thus, option B is correct.

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The number of mole of F present in 708.5 grams of F₄C is 32.2 moles

First, we shall determine the mole in 708.5 grams of F₄C. Details below:

Mole = mass / molar mass

Mole of F₄C = 708.5 / 88

Mole of F₄C = 8.05 moles

Finally, we shall determine the number of mole of F in 708.5 grams (i.e 8.05 moles) of F₄C. Details below:

From the chemical formula of F₄C,

1 mole of F₄C contains 4 moles of F.

Therefore,

8.05 moles of F₄C will contain = (8.05 mole × 4 mole) / 1 mole = 32.2 moles of F.

Thus, we can conclude from the above calculation that the number of mole of F present is 32.2 moles

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Answer:

Serine. Serine is non-essential amino acid supplied from food or synthesized by the body from a number of metabolites, including glycine. Serine is found in soybeans, nuts (especially peanuts, almonds, and walnuts), eggs, chickpeas, lentils, meat, and fish (especially shellfish).

Explanation:

Answer:

To calculate the mole fraction of alcohol in vodka, we need to know the volume fraction of alcohol in vodka, since ethanol and water have different densities.

75 proof vodka means it contains 37.5% ethanol by volume. So for 100 mL of vodka, there are 37.5 mL of ethanol and 62.5 mL of water.

The mass of 37.5 mL of ethanol is:

37.5 mL * 0.789 g/mL = 29.5875 g

The mass of 62.5 mL of water is:

62.5 mL * 1.00 g/mL = 62.5 g

The total mass of 100 mL of vodka is:

29.5875 g + 62.5 g = 92.0875 g

The mole fraction of alcohol in vodka is:

moles of ethanol / (moles of ethanol + moles of water)

To calculate the moles of ethanol, we can divide the mass of ethanol by its molar mass:

moles of ethanol = 29.5875 g / 46.07 g/mol = 0.6412 mol

To calculate the moles of water, we can divide the mass of water by its molar mass:

moles of water = 62.5 g / 18.02 g/mol = 3.4739 mol

The mole fraction of alcohol in vodka is therefore:

0.6412 mol / (0.6412 mol + 3.4739 mol) = 0.155

To calculate the molarity of alcohol in vodka, we need to divide the moles of ethanol by the volume of the vodka in liters:

moles of ethanol = 0.6412 mol

volume of vodka = 100 mL = 0.1 L

molarity of ethanol = moles of ethanol / volume of vodka

molarity of ethanol = 0.6412 mol / 0.1 L = 6.412 M

Therefore, the molarity of alcohol in vodka is 6.412 M.

According to the Foliated Metamorphic Rock Chart slate, phyllite, schist, and gneiss can all have the same parent rock (shale) is a true statement.

Slate, phyllite, schist, and gneiss are all types of metamorphic rocks that can be formed from shale, which is a sedimentary rock composed of clay and other fine-grained minerals. The specific type of metamorphic rock that is formed from shale depends on the conditions under which the shale undergoes metamorphism, including the temperature, pressure, and presence of fluids.

Slate is a fine-grained metamorphic rock with a uniform, flat surface and a layered structure. It is formed when shale undergoes low-grade metamorphism, which occurs at relatively low temperatures and pressures.

Therefore, Gneiss, on the other hand, is a medium- to coarse-grained metamorphic rock with a banded or wavy texture. It is formed when shale undergoes high-grade metamorphism, which occurs at higher temperatures and pressures.

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