A liquid is exposed to infrared radiation with a wavelength of 5.10×10−4 cm.
Assume that all the radiation is absorbed and converted to heat. How many photons are required for the liquid to absorb 42.75 J
of heat?

A scientist determined  the bones from a mastodon , The bones were 9377 years old when they were first found.

Find the decay constant (λ) first by using

λ= 0.693÷t₁/₂

λ=0.693÷5750

λ= 1.205×10⁻⁴

Now,

N=N₀e⁻λt

Where, originally,  N₀= Mass of radioactive element

N= mass of radioactive  element after time t

Apply natural logarithm on both the sides

In N=N₀₋λt

Let  N₀ be 100 then N will be 100-58.8

= 41.1

In (41.1)= In (100)₋(1.205×10⁻⁴t)

In [41.1÷100]= ₋1.205×10⁻⁴t

₋1.136= ₋1.205×10⁻⁴t

t= ₋1.13÷(₋1.205×10⁻⁴)

t= 9377 years

Radioactive : Radioactivity is the term used to describe how an atomic nucleus splits or decays. Radiation is emitted when a radioactive material decays. A few types of decay include spontaneous fission, beta decay, gamma decay, neutron emission, and alpha decay.

Bones: The majority of vertebrate animals contain bones, which are rigid organs and a part of their skeleton. The bones, which also produce red and white blood cells, store minerals, provide the body structure and support, and allow motion, protect the body's other organs.

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The mass of a substance with given number of molecules can be calculated by first finding the number of moles in the substance as follows:

No. of moles = no of molecules ÷ Avogadro's number

Mass of these substances can be calculated by multiplying the number of moles by their molar mass as follows:

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Answer:

thanks

Explanation:

thanks

Answer:

0.877 mL

Explanation:

The box's density would be the ratio of the mass of the box and its volume
which is, (23.23/26.5) mL
or, 0.8766 mL
We must round this down to 3 significant figures,
which will be 0.877 mL

Answer: We can point out two main reasons: atoms and molecules are too small to bee seen without the help of complex equipments and there are too many particles (atoms or molecules) in a small amount of substance (6.022 x 10^23 particles per mol of substance).

Explanation:

The question requires us to explain why atoms and/or molecules can't be count in dozen.

We can point out two main reasons for why it is not practical to count atoms and molecules the way we do with donuts and eggs, for example:

- The first one is the size of this particles. We need powerful and complex equipments to be able to see atoms and molecules. The size of atoms, for example, is measured in Angstroms, which corresponds to 10^-10 meters. Although molecules are slightly bigger, they are still too small to be seen without complex microscopes.

- Considering that we were able to see atoms and molecules in order to count them, there would be another issue: the amount of atoms and/or molecules contained in small amount of substances is too big. For example: let's consider 18 g of water, which corresponds to approximately 1 mol of this substance; in 18 g of water there are 6.022 x 10^23 molecules of water - which is way more complex than counting a dozen (12) units of donuts, for example.

Answer:

group 18 has 8 valence electrons, that's why they are stable.

8!

Explanation:

You're looking at the very last column, right? Noble gases are known for their stability because their valence shells are full! Lucky for you, all you have to do to know the number of valence electrons is look at the column number and take ignore the 1! 16 becomes 6, 18 becomes 8.

Answer:

Ans: 8.9 NaCl

Explanation:

Ocean water contains 3.5 nacl by mass how much salt can be obtained from 254 g of seawater

Question: Ocean water contains 3.5% NaCl by mass. How much salt can be obtained from 254g of seawater?

Answer:

Because the particles cannot move around, a solid has a fixed shape. Liquids do not have a fixed shape but they do have a fixed volume. The particles are very close together. ... A liquid can flow and take the shape of its container.

Explanation

PAY ATTENTION IN CLASS!!!

250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.

w/v = [ mass of solute (g) / volume of solution (mL) ] × 100

5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100

volume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100

volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100

volume of solution (mL) = [ 125 g / 0.05 ] x 100

1. The IUPAC name of N is nitrogen.

2. Nitrogen dioxide

3.The IUPAC name of O is oxygen

4.The IUPAC name of OH is hydroxyl.

The IUPAC name of ·0 is a radical. It is commonly found in organic chemistry and plays an important role in many reactions.

IUPAC names for the given compounds are:1.1. N: Nitrogen

The IUPAC name of N is nitrogen.

It is a non-metal and belongs to group 15 in the periodic table. It has an electronic configuration of 1s2 2s2 2p3.1.2. NO2: Nitrogen dioxide

Explanation: NO2 is a chemical compound that is formed by the combination of nitrogen and oxygen. It is a reddish-brown gas that has a pungent odor.

The IUPAC name of NO2 is nitrogen dioxide.1.3. O: Oxygen

Explanation: The IUPAC name of O is oxygen.

It is a non-metal and belongs to group 16 in the periodic table. It has an electronic configuration of 1s2 2s2 2p4.

X: UnknownExplanation: No IUPAC name can be given to an unknown compound as the structure and composition are not known.

Y: Hydroxyl Explanation: The IUPAC name of OH is hydroxyl.

It is a functional group that is composed of an oxygen atom and a hydrogen atom (-OH). It is commonly found in alcohols and phenols. ·0: RadicalExplanation: A radical is a molecule or an ion that contains an unpaired electron.

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Note: The complete question is given below

Provide the IUPAC names for the following compounds:

\(CH_3CH_2CH(CH_3)CH_2CH_2CH_2CH_3\)

C6H5CH(CH3)2

H2NCH2CH2CH2CH2CH2NH2

CH3CH2CH2CH2CH2OH

CH3CH2CH2CHOHCH3

The atomic mass of element A, given that the first isotope has abundance of 18.18% and a mass of 147.99, is 131.43 amu

From the question given above, the following data were obtained:

The atomic mass of the element A can be obtain as illustrated below:

Atomic mass = [(Mass of 1st × 1st%) / 100] + [(Mass of 2nd × 2nd%) / 100]

Inputting the given parameters, we have:

Atomic mass = [(147.99 × 18.18) / 100] + [(127.76 × 81.82) / 100]

Atomic mass = 26.90 + 104.53

Atomic mass = 131.43 amu

Thus, the atomic mass of element A obtained from the above calaculation is 131.43 amu

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Answer:

Explanation:

C₁₂H₂₂O₁₁

1 )

Molar mass = 12 x 12 + 22 x 1 + 11 x 16

= 144 + 22 + 176

= 342 g

2 )

100 mL of 1.0 M will contain 1.0 x0.100 = .1 mole of sucrose

0.1 mole of sucrose = 0.1 x 342 g = 34.2 g of sucrose.

So , mass of sucrose required is 34.2 g .

3 )

100 mL of .5 M sucrose = .100 x .5 mole of sucrose

= .05 mole of sucrose

.05 mole of sucrose = .05 x 342 g = 17.1 g of sucrose .

So , mass of sucrose required is 17.1 g .

Answer:

Explanation:

Propionic acid  has chemical formula of  C₃H₆O₂ , and smells somewhat unpleasant (like body odour).

The molar mass of phenyl alanine is 165 g/mol and the mas of the phenyl alanine is 211.2 g /mol

We know that the statement in the question has told that from the reaction equation. It is one mole of the aspartame that is required to be able to obtain one mole of the phenylamine.

Now we know that the number of moles of the aspartame that is required can be obtained by the use of;

Number of moles =  mass/molar mass

=  378g/294.3 g/mol

= 1.28 moles

Molar mass of phenylalanine = 9(12) + 11(1) + 14 + 2(16)

=108 + 11 + 14 + 32

= 165 g/mol

Hence mass of the phenylamine = 1.28 moles * 165 g/mol

= 211.2g

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Answer:a. 2Hg(NO3)2(s) → 2Hg(l) + 2NO2(g) + O2(g)

b. Ca3(PO4)2(aq) + 2H3PO4(aq) → 3Ca(H2PO4)2(aq)

c. 3NaOH(aq) + FeCl3(aq) → Fe(OH)3(aq) + 3NaCl(aq)

Explanation:

\(0.225 moles\) of nitrogen gas are produced when\(36.0 g\) of NH4NO3 reacts.

The reaction for the decomposition of ammonia nitrate (NH4NO3) is given by:

NH4NO3 → N2 + 2H2O

The number of moles of nitrogen gas (N2) produced when 36.0 g of NH4NO3 reacts can be determined using the following steps:

1. Calculate the molar mass of NH4NO3.

\(Molar mass of NH4NO3 = (1 *14.007 g/mol) + (4 *1.008 g/mol) + (3 * 14.007 g/mol) \\ = 80.042 g/mol\)

2. Calculate the number of moles of NH4NO3 present in the given mass.

Number of moles =\(\farc{Mass}{Molar mass}\\ = \frac{36.0 g}{80.042 g/mol}\\ = 0.45 moles\)

3. Calculate the number of moles of nitrogen gas produced.

Number of moles of N2 produced = \(\frac{0.45 moles}{2 }= 0.225 moles\)

Therefore,36.0 g of NH4NO3 react with oxygen to generate g of nitrogen gas  \(0.225 moles\).

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Answer: The magnetic orientation of rocks may change in Location A and subduction occurs in Location B. I tried my best

Happy To Help ;)

Explanation:

Answer:

It is C!! Hope this helps!!

Explanation:

I got it correct on the test

The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A

In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).

When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.

Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.

In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.

The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A

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Answer:

Decrease

Explanation:

Density is defined as the mass per unit volume. Density is highly influenced by temperature.

The density of metals and copper is inversely proportional to the temperature, it means density of copper decreases with an increase in temperature or when heated. This is so because when the copper is heated, the copper atoms start vibrating faster that allows the collision of atoms with each other faster and occupying more volume than before. As the copper atoms occupy more volume, the density of copper decreases.

Hence, the correct answer is "On applying heat the density of copper decreases".

Multiply the number of moles of glucose by the molar mass of water (18.015 g/mol) to find the mass of water vapor produced.

To determine the mass of water vapor produced in the reaction, we need to analyze the data provided in the data table. The reaction mentioned is the process of cellular respiration, where glucose (C6H12O6) combines with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). We can use the principle of conservation of mass to calculate the mass of water vapor produced.The data table should provide the initial masses of glucose and oxygen, as well as the final mass of carbon dioxide. From these measurements, we can calculate the mass of water vapor.First, determine the number of moles of glucose and oxygen by dividing their respective masses by their molar masses. Then, use the balanced equation for cellular respiration to determine the mole ratios between glucose, oxygen, carbon dioxide, and water.

The balanced equation for cellular respiration is:

C6H12O6 + 6O2 -> 6CO2 + 6H2O

Based on this equation, we know that for every mole of glucose, 6 moles of water are produced.In conclusion, by using the principles of conservation of mass and stoichiometry, you can calculate the mass of water vapor produced in the reaction based on the given measurements.

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Answer:

75.9 KPa

Explanation:

From the question given above, the following data were obtained:

Initial volume (V1) 20000 L

Initial pressure (P1) = 748 kPa

Initial temperature (T1) = 525 K

New temperature (T2) = 293 K

New volume (V2) = 110000 L

New pressure (P2) =?

The new pressure pressure of the gas can be obtained by using the general gas formula as illustrated below:

P1V1 / T1 = P2V2 / T2

748 × 20000 / 525 = P2 × 110000 / 293

14960000 / 525 = P2 × 110000 / 293

Cross multiply

P2 × 110000 × 525 = 14960000 × 293

P2 × 57750000 = 4383280000

Divide both side by 57750000

P2 = 4383280000 / 57750000

P2 = 75.9 KPa

Thus, the new pressure of the gas is 75.9 KPa

Answer:

B

Explanation:

3.2 × 10⁴

= 3.2 × 10000

= 32000 m

-1113.5kJ is the theoretical enthalpy of combustion.

What makes energy different from enthalpy?

The entire amount of heat energy that is either absorbed or released in a thermodynamic system is measured by enthalpy. Internal energy denotes all of the potential or moving energy present in a thermodynamic system.

Enthalpy of combustion is the term used to describe the change in a system's enthalpy that occurs when one mole of a substance fully burns in oxygen or air at a specific temperature.

C₂H5OH()+302(g) → 2CO2(g) + 3H₂O(1)

Reactants:

5 C-H : 5*412

1 C-C : 348

1 C-O: 358

3 O=O: 3* 496

1 O-H: 463

Products:

2*2 C=O : 4*743

2*3 O-H: 6*463

Enthalpy of Vaporization (kJ mol-¹) for :

Ethanol 42.5

Water 41​

Enthalpy of combustion : (5*412 + 348 + 358 + 3* 496 + 463 + 42.5) - ( 3*41 + 4*743 + 6*463)    

                                        : -1113.5kJ

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Answer

387 g

Procedure

We need to use a dimensional analysis considering the given solubility to solve this question. Also, we will consider 3 significant digits.

Answer:

С3Н6.

Explanation:

Hello!

In this case, since addition reactions imply that a radical or some radicals are added to the parent chain, we notice that only unsaturated hydrocarbons are able to undergo addition whereas saturated ones undergo substitution reactions as they already have all the carbon bonds bonded to leaving groups.

In such a way, we can rule out C2H6, C3H8 and CH4 as they are all alkanes; therefore, only С3Н6 is able to undergo an addition reaction due to the C=C which is able to lose one of those bonds and allow an incoming radical to get included into the parent chain.

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Strong Acid: dissolves and dissociates 100% to produce protons (H+) 1. seven strong acids: HCl, HBr, HI, HNO3, H2SO4, HClO4, & HClO3 2. ... Weak Acid: dissolves but less than 100% dissociates to produce protons (H+) 1.

Answer:

B. K - Lysine.

Explanation:

Required

The easiest amino acid to distinguish

The 4 amino acids in the question can be grouped into 2. The groups are:

(1) Group I - Nonpolar amino acids and (2) Group IV - Basic amino acids

Three of the amino acids belong to group I while the last belongs to group IV.

The acids according to their categories are:

(1) Group I - Nonpolar amino acids:- Phenylalanine, Valine and Glycine

(2) Group IV - Basic amino acids:- Lysine

Because Lysine belongs to a different group different from the other three, it will be easily distinguished because it will exhibit a different property from the other three acids.

A is the answer

In an ozone molecule, the three atoms must be connected, so there must at least be a single bond between them. Place

dots in pairs around the oxygen atoms until each oxygen atom has eight valence electrons, starting with the atoms on the

outside and doing the central atom last if there are enough. Do not exceed the total number of valence electrons

identified in part A. Remember that the dashes between the oxygen atoms, which represent single bonds, each indicate

the presence of two valence electrons

Answer:

Explanation: i did it

Answer:

Explanations: