how many moles are in 7.2x10^15 atoms of Pb?​

Answer:

C. C

Explanation:

Intermediates are species that are neither reactants nor products.

In this reaction;

Reactant = C3H8 and O2

Products = CO2 + H2O

From the options, the only element that is either the reactants nor products is;

C. C

The concentration of HNO3 is 0.10 M. This is determined by using the volume and concentration of NaOH used in the titration and applying the stoichiometry of the reaction between HNO3 and NaOH.

In a titration, the goal is to determine the concentration of an unknown solution by reacting it with a known solution of a different substance. In this case, \(HNO_3\)is being titrated with NaOH. The balanced equation for the reaction between \(HNO_3\)and NaOH is:

\(HNO_3 + NaOH\) -> \(NaNO_3 + H_2O\)

From the equation, we can see that the stoichiometry of the reaction is 1:1 between \(HNO_3\)and NaOH. This means that for every mole of  one mole of NaOH is required to reach equivalence.

Given that 0.20 L of 0.2 M NaOH is used, we can calculate the number of moles of NaOH:

moles of NaOH = volume of NaOH (L) × concentration of NaOH (M)

            = 0.20 L × 0.2 M

            = 0.04 moles

Since the stoichiometry is 1:1, the number of moles of \(HNO_3\)is also 0.04 moles. To determine the concentration of HNO3, we divide the moles of \(HNO_3\) by the volume

concentration of \(HNO_3\)= moles of \(HNO_3\)/ volume of \(HNO_3\)

                    = 0.04 moles / 0.24 L

                    = 0.1667 M

Rounding to an appropriate number of significant figures, the concentration of \(HNO_3\)is approximately 0.10 M.

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Answer:

C. The temperature at which the solution freezes is lowered.

Answer:

2.138 x 10^26 atoms Na

Explanation:

atoms Na = 355 mol Na x (6.022 x 10^23 atoms Na/1 mol Na) = 2137.81 x 10^23 atoms Na = 2.138 x 10^26 atoms Na

Answer:

It is important to identify it because the two types of crust are made up of two different types of rock

Explanation:

Have a nice day

The n and l values and the number of orbitals For sublevel 5s, n = 5, l = 0,number of orbitals = 1

The rules for electron quantum numbers are:

So, n =4, shell number 4.

Sublevel f, l = 3.

Number of orbitals =  2l +1 = 7

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The ratio of carbon : oxygen : hydrogen in the empirical formula is 1 : 1 : 2.

The empirical formula represents the simplest whole number ratio of atoms in a compound. To find the ratio of carbon, oxygen, and hydrogen in the given compound, we need to convert the weight percent to moles.

1. Convert the weight percent of each element to moles by dividing the weight percent by the atomic mass of the element.
  - Carbon: 40.0% ÷ 12.01 g/mol = 3.33 moles
  - Oxygen: 53.3% ÷ 16.00 g/mol = 3.33 moles
  - Hydrogen: 6.7% ÷ 1.01 g/mol = 6.63 moles

2. Divide the moles of each element by the smallest mole value to get the simplest whole number ratio.
  - Carbon: 3.33 moles ÷ 3.33 moles = 1
  - Oxygen: 3.33 moles ÷ 3.33 moles = 1
  - Hydrogen: 6.63 moles ÷ 3.33 moles = 1.99 (approx. 2)

Therefore, the ratio of carbon : oxygen : hydrogen in the empirical formula is 1 : 1 : 2.

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The concentration of a solution in a titration procedure can be calculated using the following formula;

CaVa = CbVb

Where;

According to this question, It took 24.61ml of 0.627m potassium hydroxide to neutralize 100ml of hydrobromic acid.

100 × Ca = 24.61 × 0.627

100Ca = 15.43

Ca = 0.154 M.

Molarity = no of moles ÷ volume

no of moles = 0.1 L × 0.154 M = 0.0154 moles

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The correct answer is option (c) Ti4+.

The species which are attracted to a magnetic field are known as paramagnetic species. If we talk about the given options, then we can see that there are only 3 species that are given. Out of these three, only Ti4+ is paramagnetic. How can we determine whether a species is paramagnetic or not? The species which contain unpaired electrons are paramagnetic in nature. If there are all paired electrons, then the species are diamagnetic. If we talk about Ti4+, then it contains 2 unpaired electrons, which makes it paramagnetic. This is the reason why the correct answer is Ti4+.In Ar, all the electrons are paired, which makes it diamagnetic. In O, there are 2 unpaired electrons, which makes it paramagnetic. How can we determine whether a species is paramagnetic or not? The species which contain unpaired electrons are paramagnetic in nature. If there are all paired electrons, then the species are diamagnetic.

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Answer:

Best regards.

Explanation:

Hello,

In this case, we relate the heat, mass, heat capacity and temperature when a thermal change is carried out as shown below:

\(Q=mCp(T_{final}-T_{initial})\)

Now, for the given data, we compute the absorbed heat (due to the temperature increase) as follows:

\(Q=15.0g*0.900\frac{J}{g^oC}*(350^oC-25^oC) \\\\Q=4.39x10^3J=4.39kJ\)

Best regards.

Answer:

4,387.5 J was absorbed

Explanation:

Calorimetry is the part of physics that is responsible for measuring the amount of heat generated or lost in certain physical or chemical processes.

In this way, there is a direct proportional relationship between heat and temperature. Thus, the amount of heat received or transferred by a body when it undergoes a temperature variation (Δt) without there being a change of physical state (solid, liquid or gaseous) is calculated using the following expression:

Q = c * m * ΔT

Where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case:

Replacing:

Q= 0.900 \(\frac{J}{g*C}\) *15 g * 325 °C

Q=4,387.5 J

4,387.5 J was absorbed

Answer: isozymes

Explanation:

The two ways in which humans have negatively affected groundwater are Fertilizers and pesticides.

Fertilizers were chemical substances that are applied to crops in order to boost their yield.

Pesticides are chemicals that are being used to keep pests at bay. Herbicides, insecticides, nematicides, and molluscicides are examples.

Fertilizers and pesticides applied to the land, manure from livestock as well as other animals, landfills, mining operations, even unintended releases such as chemical spills or storage tank leaks are all factors that affect groundwater quality.

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At pH 7.4, pyruvate exists in its anionic form, known as pyruvate anion or pyruvate ion structure is (CH3COCOO-).

The net reaction of glycolysis, including coefficients, can be summarized as follows:

Glucose + 2 ADP + 2 Pi + 2 NAD+ ⟶ 2 Pyruvate + 2 ATP + 2 NADH

Here are the values for the coefficients:

a = 2 (since 2 ADP molecules are consumed)

b = 2 (since 2 Pi molecules are consumed)

c = 2 (since 2 NAD+ molecules are consumed)

x = 2 (since 2 pyruvate molecules are produced)

y = 2 (since 2 ATP molecules are produced)

z = 2 (since 2 NADH molecules are produced)

To draw the structure of pyruvate at pH 7.4.

Pyruvate is a three-carbon molecule with the chemical formula C3H4O3.

At pH 7.4, pyruvate exists in its anionic form, known as pyruvate anion or pyruvate ion (CH3COCOO-).

Here is a simplified structural representation of pyruvate at pH 7.4:

In the structure, the carbon skeleton consists of three carbon atoms, with a carbonyl group (C=O) attached to one carbon and a carboxylate group (-COO-) attached to another carbon.

The remaining carbon is bonded to a hydrogen atom.

The negative charge (represented by the "-") is present on the oxygen atom, indicating the anionic form of pyruvate.

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when NaOH reacts with methyl salicylate, the product is sodium methyl salicylate and water.

(a)Salicylic acid is a simple compound with one carboxyl group and one hydroxyl group. The hydrogen atom bonded to the oxygen atom of the carboxyl group (–COOH) is more acidic than the hydrogen atom bonded to the oxygen atom of the hydroxyl group (–OH).

Because of its proximity to the electronegative oxygen and the resultant weakening of the C–H bond, hydrogen atoms on the hydroxyl groups of the salicylic acid are more acidic than the hydrogen atoms on the methyl salicylate. So, the hydrogen atom of the hydroxyl group at C-2 is the most acidic in salicylic acid.

The hydrogen atom on the methyl group (CH3) at C-8 is the most acidic in methyl salicylate.

(b)When NaOH and methyl salicylate are mixed, sodium methylsalicylate, a white solid, is produced immediately.The reaction equation is:

NaOH + CH3OC6H4COOH ⟶ CH3OC6H4COONa + H2O

Therefore, when NaOH reacts with methyl salicylate, the product is sodium methyl salicylate and water.

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As stated in the preceding statement Square pyramidal geometry describes the molecules.

An atom is made up of a core nucleus and one or maybe more electrons with negative charge that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present.

The quantity of protons an atom has makes it distinct from other atoms. Consequently, a particle devoid of protons isn't just an atom. But even a single proton constitutes every atom (of hydrogen). Individual particles of something like the periodic table elements like sodium, plutonium, argon, among chlorine are examples of atoms.

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Answer:

A=0.28kg

Explanation:

FORCE=MASS * ACCELERATION

4.6=m*16.3

Then make m the subject.

m=4.6/16.3

m=0.28kg

Non-heme iron is found in some foods that provide all the amino acids humans require for the absorption of iron.

Amino acids are defined as the substances which are considered to be the monomers of proteins.Every amino acid has the same structure  which consists  of a central carbon  bonded to an amino group , carboxyl group and a hydrogen.

Each amino acid also has  an another atom or a group of atoms bonded to the alpha carbon which are also known as the R group or the variable group of the side chain.There are 20 common amino acids which are  present in natural proteins and each amino acid has the same backbone.

The sequence and number of amino acids determines protein's shape,size and also its function. Each amino acid is attached to the other by a covalent bond formed by a dehydration reaction.

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Answer:

No, i will not use a water pipe consisting of the two metals

Explanation:

Looking at the reduction potential of the both metals, it is clear that an electrochemical cell is set up with iron as the anode and copper as the cathode.

This will make the iron to quickly corrode and eventually destroy the water pipe. It is better to have a set up in which another metal that is higher than iron in the electrochemical series is combined with it.

The structure for each of the following compounds have been attached.

a) 2,4,5-trimethyl-4-(1-methylethyl) heptane

b) 2,5-dimethyl-4-(2-methylpropyl) octane

c) 4-(1,1-dimethylethyl) octane

What are Aliphatic and aromatic compounds?

Aliphatic compounds are the name given to these hydrocarbons having open and closed chains. An aromatic structure is unique to substances with closed chains. In addition to open- and closed-chain systems, they can also be saturated or unsaturated.

The primary difference between aliphatic and aromatic hydrocarbons is that the former have a conjugated bond structure while the latter do not. However, both of these molecules are regarded as organic substances.

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Answer:

5 atoms are in each molecule of calcium carbonate

Answer:

1-T

2-F

3-T

4-T

Explanation:

big brain

To determine which air mass polygon in the source regions folder would most likely be characterized as a continental tropical (ct) air mass, we need to consider the characteristics of this type of air mass.

Continental tropical air masses originate in hot and dry regions, typically over deserts or semi-arid areas. As they move away from their source region, they can become very warm and dry, and are often associated with clear skies and high temperatures.
Based on these characteristics, the air mass polygon in the source regions folder that is most likely to be characterized as a continental tropical air mass would be the one covering the southwestern United States and northern Mexico. This region is known for its hot and dry climate, with temperatures often reaching well above 100 degrees Fahrenheit in the summer months. The air mass that originates from this region would be very warm and dry, and would likely move northward into the central and eastern United States, bringing with it hot and dry conditions.
It is important to note that air masses can change and evolve as they move away from their source region, so it is possible for a continental tropical air mass to become modified or transformed as it moves into different areas. However, based on the characteristics of the source region and the expected behavior of a continental tropical air mass, the southwestern United States and northern Mexico would be the most likely source region for this type of air mass.

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Answer:

- 2C2H6 + 7O2→4CO2+6H2O

Explanation:

Answer:

2C2H6+7O2-->4CO2+6H2O

Hope this helps!

the ratio of their velocities (Bird 1 / Bird 2) is 1, indicating that their velocities are equal.

To determine the ratio of the velocities of the two birds, we can use the formula:

Velocity = Distance / Time

Let's denote the velocity of Bird 1 as V1 and the velocity of Bird 2 as V2. We are given that Bird 2 covers twice as much distance as Bird 1, so we can write:

Distance of Bird 2 = 2 * Distance of Bird 1

Using the formula, we can express the velocities as:

V1 = Distance of Bird 1 / Time taken by Bird 1

V2 = Distance of Bird 2 / Time taken by Bird 2

Since the distance of Bird 2 is twice that of Bird 1, we can substitute the values in terms of the distance of Bird 1:

V2 = (2 * Distance of Bird 1) / Time taken by Bird 2

Now, we can calculate the ratio of their velocities:

V1/V2 = (Distance of Bird 1 / Time taken by Bird 1) / (2 * Distance of Bird 1 / Time taken by Bird 2)

     = (Time taken by Bird 2 / Time taken by Bird 1) * (1/2)

     = (12 hours / 6 hours) * (1/2)

     = 2 * (1/2)

     = 1

Therefore, the ratio of their velocities (Bird 1 / Bird 2) is 1, indicating that their velocities are equal.

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Answer:

A

Explanation:

I would assume A because it says in the problem statement that chooses aluminum because he is worried that composite will suddenly fail... therefore he would use aluminum because it would bend before breaking and therefore show warning.

Answer: series circuit

Explanation:

when one bulb burns out the other bulb will go off because the circuit breaks

The silver ring of the same mass of 27.5 gm of gold will have 1.9 times more atom.

We need to find moles first,

Moles = mass/ Atomic Mass

Then number of atoms can be calculated from moles,

So , no. of moles of gold ring = 27.5g/196.967

= 0.13 moles.

Since 1 mole contains 6.023 x 10^23 atoms, then 0.13 mole contains (6.023 c 10^23) x 0.13 atoms

= 7.82 c 10^22 atoms.

no. of moles for silver = 27.5/107.87

= 0.25 moles.

This contains (6.023 x 10^23) x 0.27 atoms.

= 1.5 x 10^23 atoms.

So 27.5g of silver contains 1.67 x 10^23/9.17 x 10^22 more atoms than 27.5g of gold.

So 27.5g silver contains 1.9 x more atoms than 27.5g of gold.

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