I need a help from this question!!

The calculation of the molecular mass of A​ is 64.

Molar mass is described as the mass in grams of 1 mole of a substance. The units of molar mass are grams in line with mole, abbreviated as g/mol. The mass of a single isotope of any given detail (the isotopic atomic mass) is a cost touching on the mass of that isotope to the mass of the isotope carbon-12.

Calculation:-

mass A = 0.2 g

mass B  = 0.16 g

vapour density = 32

molar mass = 2 × VD

                   = 64.

In chemistry, the molar mass of a chemical compound is defined as the mass of a pattern of that compound divided by using the amount of substance which is the range of moles in that sample, measured in moles. The molar mass is a bulk, now not molecular, belongings of a substance.

Molecular mass and system mass are typically used as a synonym of molar mass, specifically for molecular compounds; but, the maximum authoritative resources outline it differently.

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Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

mass = 76.6 g

volume = 12 mL

The density of iron (ll) oxide is

\(density = \frac{76.6}{12} \\ = 6.38333333...\)

We have the final answer as

Hope this helps you

Answer:

he answer is

3.83 g/mL

Explanation:

The density of a substance can be found by using the formula

From the question

mass = 76.6 g

volume = 12 mL

The density of iron (ll) oxide is

Explanation:

According to the Planck-Einstein relation, the energy of a photon emitted with a wavelength of 448 nm is 4.44 × 10⁻¹⁹ J.

A photon is a particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.

A photon is emitted with a wavelength (λ) of 448 nm. Given the speed of light (c) is 3.00 × 10⁸ m/s, we can calculate the frequency (ν) of the photon using the following expression.

ν = c/λ

ν = (3.00 × 10⁸ m/s ) / (4.48 × 10⁻⁷ m) = 6.70 × 10¹⁴ s⁻¹

We will use the Planck-Einstein relation, being Planck's constant h = 6.63 × 10⁻³⁴ J.s.

E = h × ν

E = (6.63 × 10⁻³⁴ J.s) × (6.70 × 10¹⁴ s⁻¹) = 4.44 × 10⁻¹⁹ J

According to the Planck-Einstein relation, the energy of a photon emitted with a wavelength of 448 nm is 4.44 × 10⁻¹⁹ J.

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The petal of rose has different kinds of pigments like anthocyanins, carotenoids which give them the colors.

What are Anthocyanins?

Anthocyanins are the pigment that produces red color in the roses. They belong to Flavonoids family.

The pigments in a rose's petals give it its color. These pigments mostly consist of carotenoids and anthocyanins. Bright yellow, orange, and red pigments like those in lemons, oranges, and tomatoes are made by carotenoids. They are contained in structures called plastids, which are a component of the cytoplasm of plant cells. They are therefore steady and largely unaffected by the environment or the health of the plant. Deep red, magenta, purple, and blue colors are made of anthocyanins. They are transported via the sap of the plant and are water soluble. They are far less stable and more susceptible to external variables because they are in a fluid environment.

According to research, a bloom's anthocyanin content and sap pH fluctuate as a flower develops from a bud to a bloom. The pH of the sap increases with bloom aging and anthocyanin content decreases. As those who grow hydrangeas are aware, more acidic conditions prefer the pink/red end of the color spectrum while high alkaline levels produce blue colorations. As a result, as your rose bloom ages and its pH rises, the red will tend to lean toward the darker, bluer side of the spectrum. When a flower is in bloom, anthocyanin levels are still high, but they start to drop off swiftly as the blossom fades.

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The enthalpy of combustion can be determined using the heat transfer equation and the energy balance equation.
To determine the enthalpy of combustion, we can use the energy balance equation, which states that the energy released by combustion must be equal to the energy absorbed by the products and the surroundings.

First, we need to calculate the energy released by combustion. The power produced by the engine is given as 150 kW, and the heat loss from the engine is given as 205 kW. Therefore, the net energy released by combustion is 150 kW - 205 kW = -55 kW (negative sign indicates energy release).

Next, we need to calculate the energy absorbed by the products and the surroundings. This can be done by considering the enthalpy change of the reactants and products.

The air enters at 45°C and leaves at 750 K, resulting in an increase in temperature of 750 K - 45°C = 705 K.

The liquid Iso-octane fuel is burned with 50% excess air, which means that the amount of air used is 1.5 times the stoichiometric requirement.


Finally, we can calculate the enthalpy of combustion as the sum of the net energy released by combustion and the energy absorbed by the products and surroundings.

In summary, to determine the enthalpy of combustion, we need to calculate the energy released by combustion and the energy absorbed by the products and surroundings.

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Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question

mass of mineral = 14.7 g

volume = 2.2 cm³

It's density is

\(density = \frac{14.7}{2.2} \\ = 6.681818181...\)

We have the final answer as

Hope this helps you

Answer:

6.68g/cm³

Explanation:

The formula is [ d = m/v ] where m = mass and v = volume.

We are given both "m" and "v" so we can solve using those variables.

d = 14.7/2.2

d ≈ 6.68

Best of Luck!

Explanation:

jawapannya ada dalam foto di atas

Answer:

Definetly Nitrogen

Explanation:

Nitrogen is the most electronegative

The compound's molecular formula contains three carbon atoms.

Step 1: The empirical formula CFBrO indicates that there is one carbon atom in the compound.

Step 2: To determine the number of carbon atoms in the molecular formula, we need to find the ratio between the empirical formula mass and the molar mass.

The empirical formula mass is calculated by adding the atomic masses of the constituent elements in the empirical formula:

C = 12.01 g/mol

F = 18.99 g/mol

Br = 79.90 g/mol

O = 16.00 g/mol

Empirical formula mass = (1 x 12.01) + (1 x 18.99) + (1 x 79.90) + (1 x 16.00) = 126.9 g/mol

Next, we divide the molar mass (253.8 g/mol) by the empirical formula mass (126.9 g/mol) to find the ratio:

253.8 g/mol ÷ 126.9 g/mol = 2

This ratio indicates that the compound's molecular formula contains two empirical formula units. Since each empirical formula unit contains one carbon atom, the compound's molecular formula must contain two carbon atoms.

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Let look at EC of Sodium(Na)

\(\\ \sf\longmapsto 1s^22s^22p^63s^1\)

Now look at EC of Fluorine

\(\\ \sf\longmapsto 1s^22s^22p^5\)

Now the Compound will be

\(\\ \sf\longmapsto NaF\)

a)(i) Derive the mathematical expression for calculating the equilibrium constant (K) for a redox reaction at 25°CRedox reactions occur when electrons are transferred from one atom to another in the reactants.

The Nernst equation is used to calculate the potential of a redox reaction under non-standard conditions. The Nernst equation is:Ecell = E°cell - (RT/nF)ln Q where E°cell is the standard cell potential, R is the gas constant, T is the temperature in kelvins, n is the number of electrons transferred in the redox reaction, F is Faraday's constant, and Q is the reaction quotient.

To calculate the average current per spoon that must flow during the electroplating process, we use Faraday's laws of electrolysis :F = q/n F where F is the Faraday constant, q is the charge, n is the number of electrons transferred, and F is the Faraday constant. We know that the mass of silver deposited is 2.00 g and the molar mass of silver is 107.868 g/mol .

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ANSWER

The addition of KSCN to the system will shift the arrow to the product sides

EXPLANATION

Firstly, we need to define the term chemical equilibrium.

Chemical equilibrium can be defined as the state in which the reactants and the products are present in concentration and do not have a tendency to change with time.

To determine the shift of the chemical equilibrium in the reaction provided, state the le Chatelier's principle

Le Chatelier's principle states that when external constraints such as temperature, pressure, concentration, etc system in chemical equilibrium, the equilibrium arrow shifts so as to annul the effect of the external constraints.

From the reaction provided

The above equation shows that the reaction is an exothermic reaction because heat is liberated to the surroundings.

When one of the reactants is supplied to the system constantly, more of its product is formed. Hence, the equilibrium arrow shifts to the right-hand side of the reaction.

Hence, the addition of KSCN to the system will shifts the arrow to the product sides

225.0 g of water releases -33,646.125 J of heat energy when it cools from 85.5°C to 50.0°C.

To calculate the amount of heat released when water cools, we can use the formula:

Q = m * c * ΔT

Where:

Q is the heat energy in joules,

m is the mass of the water in grams,

c is the specific heat of water in J/g•°C,

ΔT is the change in temperature in °C.

Given:

m = 225.0 g

c = 4.18 J/g•°C

ΔT = (50.0°C - 85.5°C) = -35.5°C (negative because the water is cooling)

Substituting these values into the formula, we have:

Q = 225.0 g * 4.18 J/g•°C * (-35.5°C)Q = -33,646.125 J

The negative sign indicates that heat is being released by the water as it cools. Therefore, 225.0 g of water releases -33,646.125 J of heat energy when it cools from 85.5°C to 50.0°C.

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The main safety hazards of trimethylsilyl chloride (tmscl)  in the lab are,

It could cause severe eye burns.

It is harmful if absorbed through the skin. It could cause severe burns.

It may be harmful if swallowed. Causes severe digestive tract burns.

It may be harmful if inhaled. Causes chemical burns to the respiratory tract.

Prolonged or repeated skin contact may cause dermatitis.

Trimethylsilyl chloride, commonly referred to as chlorotrimethylsilane, is a silyl halide (organosilicon chemical) with the formula (CH3)3SiCl. It is also referred to as Me3SiCl or TMSCl. It is a volatile, colorless liquid that is stable when there is no water present. It has many applications in organic chemistry.

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Answer:

i think false

Explanation:

Centre of mass is the point at which the distribution of mass is equal in all directions, and does not depend on gravitational field. Centre of gravity is the point at which the distribution of weight is equal in all directions, and does depend on gravitational field

found it on google so it could be wrong

Answer:

True

Explanation:

I took a quiz and got it right

pls mark as brainliest.

Explanation:

1 grams Ammonia to mol = 0.05872 mol

mass of ammonia = 2.75÷ 0.05872

mass of ammonia=46.8324250681 gm

Answer:

\(\boxed {\boxed {\sf 46.8 \ g \ NH_3}}\)

Explanation:

We are asked to calculate the mass of 2.75 moles of ammonia.

We convert moles to grams using the molar mass or the mass of 1 mole of a substance. These values are equivalent to the atomic masses on the Periodic Table, but the units are grams per mole instead of atomic mass units.

Look up the individual elements in the compound of ammonia: NH₃

Notice that there is a subscript of 3 after H in the chemical formula. There are 3 moles of hydrogen in 1 mole of ammonia. We must multiply hydrogen's molar mass by 3 before adding nitrogen's molar mass.

We convert using dimensional analysis. First, set up a ratio using the molar mass.

\(\frac {17.031 \ g \ NH_3}{ 1 \ mol \ NH_3}\)

We are converting 2.75 moles of ammonia to grams, so we multiply the ratio by this value.

\(2.75 \ mol \ NH_3 * \frac {17.031 \ g \ NH_3}{ 1 \ mol \ NH_3}\)

The units of moles of ammonia cancel.

\(2.75 * \frac {17.031 \ g \ NH_3}{ 1}\)

\(46.83525 \ g \ NH_3\)

The original measurement of moles (2.75) has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tenth place. The 3 in the hundredth place tells us to leave the 8 in the tenth place.

\(46.8 \ g \ NH_3\)

There are approximately 46.8 grams of ammonia in 2.75 moles of ammonia.

Answer:

What occurs when the temperature of 10.0 grams of water is changed from 15.5°C to 14.5°C? [Specific Heat of Water = 4.18 J/g •k] 1) The water absorbs 41.8 joules. 2) The water absorbs 155 joules.

Explanation:

Take a look at the specific heat of water. As you know, a substance's specific heat tells you how much heat is needed in order to increase the temperature of 1 g of that substance by 1∘C . In water's case, you need to provide 4.18 J of heat per gram of water to increase its temperature by 1∘C .

Answer:

21.504 liters

Explanation:

Given: 0.960 mol

Volume: ?

Molar Volume at STP = 22.4 liters

0.960 mol × 22.4 L/ 1 mol =

0.960 × 22.4 L = 21.504 L

Answer:

35

Explanation:

Given parameters:

  Atomic number of zinc  = 30

  Mass number of zinc = 65

Unknown

  Number of neutrons  = ?

Solution:

The mass number of an atom is the sum of its protons and neutrons;

     Mass number  = Protons + neutrons

Atomic number is the number of protons in an atom;

   Atomic number  = Protons

So;

     Mass number  = Atomic number + Neutrons

Neutrons  = Mass number  - Atomic number

 Neutrons  = 65 - 30  = 35

The number of neutrons in the atom is 35

An enzyme serves as a place where a chemical reaction can occur because it can reduce the activation energy necessary for the reaction to take place.

What is an enzyme?

An enzyme is a type of protein molecule that functions as a biological catalyst. It is responsible for increasing the rate of chemical reactions that occur in living organisms by reducing the activation energy necessary for the reaction to occur.

A chemical reaction requires the breaking of bonds and the formation of new bonds. However, this process requires energy, which is referred to as activation energy. The activation energy must be supplied to the reactants in order to initiate the reaction. Enzymes, on the other hand, lower the activation energy required for a reaction, making it easier for the reaction to occur.

Conclusion

Enzymes are proteins that speed up chemical reactions in living organisms by reducing the activation energy required for a reaction. Without enzymes, many of the chemical reactions necessary for life would not occur.

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Answer:

The Compound is Zn(NO3)2

Explanation:

When a transition metal nitrate is heated it produces its oxide, NO2, and O2, therefore, in this case producing ZnO, NO2 and O2.

When ZnO is heated, it turns yellow and back to white when cooled, and since we can assume that barely any time passed between the heating and the observation, we can guess that it is zinc.

Another clue is that it says its neutralised by both acidic and alkaline, this is because zinc, like aluminium, is an amphoteric oxide.

The substance B must be lead II nitrate and the yellow residue is lead II oxide.

Decomposition reaction is a type of chemical reaction in which a substance is broken down into its constituents. The decomposition of lead II nitrate yields, lead II oxide, nitrogen IV oxide and oxygen gas.

The equation for the decomposition of lead II nitrate is; 2Pb(NO3)2 ------>  2PbO + 4NO2 + O2. The substance B must be lead II nitrate and the yellow residue is lead II oxide.

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Answer:

The mass of 25 g of CO2 is approximately 25.01 g.

Explanation:

The molar mass of CO2 (carbon dioxide) is approximately 44.01 g/mol.

To calculate the mass of 25 g of CO2, we can use the following formula:

mass = number of moles × molar mass

First, we need to determine the number of moles of CO2 in 25 g. We can do this by dividing the mass by the molar mass:

number of moles = 25 g ÷ 44.01 g/mol ≈ 0.568 mol

Now, we can use the formula above to calculate the mass:

mass = 0.568 mol × 44.01 g/mol ≈ 25.01 g

Therefore, the mass of 25 g of CO2 is approximately 25.01 g.

The image of (-2,-2) after a dilation by a scale factor of 2 centered at the origin is -10,-10.

Dilation is defined as a method of altering an object's or shape's size by reducing or expanding its dimensions by certain scaling parameters.

It can also be defined as the state of being stretched or swollen beyond what is usual, especially as a result of illness, overwork, or abnormal relaxation, which can cause dilatation of the heart or dilatation of the stomach.

Simply multiply by 5 because the point is at the origin.

So, -2 x 5 = -10

and -2 x 5 = -10

Thus, the image of (-2,-2) after a dilation by a scale factor of 2 centered at the origin is -10,-10.

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INFORMATION:

We know that:

- The normal boiling and freezing points of argon are 87.3 K and 84.0 K

- The triple point is at 82.7 K and 0.68 atmosphere.

And we must draw a phase diagram for argon using the data

STEP BY STEP EXPLANATION:

To draw the diagram, we must graph first the triple point since it is the common point for the three states of the argon

Then, we need to use that the normal boiling and freezing points of argon are 87.3 K and 84.0 K to divide he states of the argon in the graph

Finally, we need to show the position of the normal boiling point

So, we obtain the next graph

ANSWER:

Answer:

The molarity of the final solution  is 1.7 M

Explanation:

The parameters given are;

First solution = 400 ml of 1.25 M

Second solution = 300 ml of 2.30 M

Therefore, we have;

First solution contains 400/1000 * 1.25 moles = 0.5 moles of the substance

Second solution contains 300/1000 * 2.30 moles = 0.69 moles of the

Hence the sum of the two solutions contains 0.5 + 0.69 = 1.19 moles of the substance

The volume of the sum of the two solutions = 400 ml + 300 ml = 700 ml

Hence we have the concentration of the final solution presented as follows;

700 ml contains 1.19 moles of the substance

Therefore;

1000 ml will contain 1000/700 * 1.19 = 1.7 moles

The molarity of the final solution = The number of moles per 1000 ml = 1.7 M.

Answer:

b-acting as a standard unit of measure

Explanation:

Julie uses the mark for initially acting as a standard unit of measure. The correct option is b.

Recognizing and writing down an occurrence or fact is the process of observation, which frequently entails measuring it with tools. Utilizing tools for measurement is frequently required when recognizing and documenting an occurrence or fact. Written observations taken during or right after fieldwork are referred to as field notes.

They are essential for comprehending occurrences observed in the field. Scratch notes, diaries, and notebooks are common formats for field notes. The process of observation is essential in science. Snails are the molluscan. It comes under zoological study.

Therefore, the correct option is b. acting as a standard unit of measure

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