please help it's already past due​

Answer:

ΔH°f{IF(g)} = -127.58 kJ/mol

Explanation:

Hello.

In this case, since the information about the chemical reaction is:

IF7(g) + I2(g) → IF5(g) + 2 IF(g) ; ΔH°rxn = -89 kJ / mol

ΔH°f{IF7(g)} = -941 kJ / mol

ΔH°f{IF5(g)} = -840 kJ / mol

ΔH°f{I2(g)} =62.42 kJ / mol (it should be 0 since I2 is a pure element that is nor formed by other elements, however, we will use the given value).

Since we don't know the enthalpy of formation of IF, but the enthalpy of reaction for this one is:

ΔH°rxn = ΔH°f{IF5(g)} + ΔH°f{IF(g)} - ΔH°f{IF7(g)} - ΔH°f{I2(g)}

We can obtain it via:

ΔH°f{IF(g)} = ΔH°rxn - ΔH°f{IF5(g)} + ΔH°f{IF7(g)} + ΔH°f{I2(g)}

ΔH°f{IF(g)} = -89 - (-840) + (-941) + 62.42

ΔH°f{IF(g)} = -127.58 kJ/mol

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Answer:

salt water or cake mix but, I'm pretty sure salt water

Answer:

it is sugar i got it right on study island

Explanation:

Answer:

.

Explanation:

Answer:

The green frog's population decreases because they cannot blend as easily into the mostly brown environment of the dry river bed as their brown counter parts. There are not as many green plants for them to hide against, making it easier for predators to see them.

Explanation:

The green frog's population decreases because they cannot blend as easily into the mostly brown environment of the dry river bed as their brown counter parts. There are not as many green plants for them to hide against, making it easier for predators to see them.

Answer:

C2HO

Explanation:

According to this question, acetic acid has a composition of 40.00% C, 6.71% H, and 53.29% O.

This means that;

40.00% C = 40.00g of Carbon

6.71% H = 6.71g of Hydrogen

53.29% O = 53.29g of Oxygen

First, we convert each mass to mole by dividing by their respective atomic mass;

C = 12g/mol, O = 16g/mol, H = 1 g/mol

C = 40.00/12 = 3.33moles

H = 6.71/1 = 6.71moles

O = 53.29/16 = 3.33moles

Next, we divide each mole by smallest value (3.33moles);

C = 3.33/3.33 = 1

H = 6.71/3.33 = 2.01

O = 3.33/3.33 = 1

Approximately, the empirical ratio of CHO is 1:2:1. Therefore, the empirical formula is CH2O.

Acetic acid, which is present in vinegar, was found to consist of by mass. Find the empirical formula for acetic acid

Answer:

Answer : The volume of water and alcohol present in 675 mL of this solution is 405 mL and 270 mL respectively.

Explanation :

As we are given that 40.0 % (v/v) alcohol solution. That means, 40.0 mL of alcohol present in 100 mL of solution.

Now we have to calculable the volume of alcohol in 675 mL solution.

As 100 mL of solution contains 40.0 mL of alcohol

So, 675 mL of solution contains alcohol

Thus, the volume of alcohol = 270 mL

Now we have to calculate the volume of water.

The volume of water = Volume of the solution - Volume of alcohol

Volume of water = 675 mL - 270 mL

The volume of water = 405 mL

Thus, the volume of water = 405 mL

Hence, the volume of water and alcohol present in 675 mL of this solution is 405 mL and 270 mL respectively.

790 mL of an 80 proof brandy, which is 40.0 % (v/v) ethyl alcohol, contain 316 mL of ethyl alcohol.

An 80 proof brandy is 40.0 % (v/v) ethyl alcohol, that is, there are 40.0 mL of ethyl alcohol per 100 mL of brandy. This is the conversion factor.

We have 790 mL of brandy. This is the given information.

The milliliters of ethyl alcohol in 790 mL of brandy are:

[tex]790 mL Brandy \times \frac{40.0mLAlcohol}{100mLBrandy} = 316mLAlcohol[/tex]

790 mL of an 80 proof brandy, which is 40.0 % (v/v) ethyl alcohol, contain 316 mL of ethyl alcohol.

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ionic solid try this answer I’m sure it’s gonna work

Magnesium chloride is a colorless crystalline solid.MgCl₂ is an ionic compound. Therefore, option A is correct.

When an atom (or group of atoms) gains or loses electrons, ions form charged particles, forming ionic compounds. A cation is a positively charged ion, whereas an anion is a negatively charged ion.

When a metal reacts with a nonmetal, ionic compounds are (usually) formed or a polyatomic ion.

MgCl2 is an ionic compound because the chemical bonds in the molecule are formed by electron transfers between Mg and Cl atoms. Magnesium is an alkaline earth metal that loses two electrons to form magnesium cation, whereas chlorine is a nonmetal that accepts one electron to form chloride ion.

Thus, option A is correct.

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Answer:

The concentration (in mM units) of vitamin C in the juice is 0.64mM.

Explanation:

Let us calculate -:

Concentration of sample =>[tex]1ml\times 29.4mM[/tex]

                               = 29.4 mmol => 29.4mmol/50ml

                               = 0.588mM

plug in formula =>[tex]\frac{[final concentration]}{[v_1/v_2]} \times[final concentration]+[concentration of sample])[/tex] or

[tex]\frac{[x]}{[v_1/v-2]} \times[ x]+[concentration of sample])[/tex]

= [2.02 micro-Amber/3.79micro-Amber]

plug in and simplify

1.81x = 1.17

x = 0.64mM

Hence , the answer is 0.64mM.

Answer:

To start, you need know that all a mole means is you have 6.022 x 1023 atoms of that type. So if I tell you I have a mole of nitrogen, then I have 6.022 x1023 nitrogen atoms. That ugly number is called Avogadro's Constant, NA

Explanation:

hy its isnt the correct answer but checkout the equation hope it help help

Answer:

Explanation:

Suppose we dehydrate 2-methylcyclohexanol, the products formed are 1-methylcyclohexene and 3 methylcyclohexene, where 1-methylcyclohexene tends to be the major product because it has the tendency of more substituted double bond.

In any event, gas chromatography method usually reveals two products with their relative amounts but not their identities.

Now, if we carry out a reaction containing those two products and let's say we have a peak 10:1. Then, we add a little drop of 3-methylcyclohexene to the mixture and carry out the test again.

Let's say that the new ratio is 3:1. Therefore, we can conclude that the minor product is 3-methylcyclohexene. However, if the ratio is larger, let say 20:1, then the original sample's major product is 3-methylcyclohexene.

We expect new chromatogram to show the major quantity of one of the formed products.

Gas chromatography is a kind of analytical method in the chemistry to separate and analyze the components of any compound by the adsorption process.

When we already run our product on the gas chromatogram and after the result we add a drop of 3-methylcyclohexene in the product then we don't observe much difference in the result. Because from the gas chromatography result we only get the quantity of any substance not the identity. If already in the product 3-methylcyclohexene was present then in that condition we get a higher peak in graph and identify the component of product.

Hence, 3-methylcyclohexene gives idea about the quantity.

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Answer:

C the simultaneous collisions of fast-moving particles with the container

Explanation:

Answer:

solusoin ( 0.0130 )²

Explanation:

Answer:

Accept electrons

Explanation:

Non metals are found towards the right hand side of the periodic table. They usually possess more valence electrons than metals.

Hence, they do not give out electrons as metals do in order to become isoelectronic with the noble gases because this will cost a lot of energy. Rather, they accept electrons in order to become isoelectronic with noble gases.

Isoelectronic means that the both species have the same number of electrons. In accepting electrons, nonmetals form negative charges.

Answer:

The answer would be Noble gases

Noble gases is the periodic family which has a full outermost valence shell and rarely reacts with other element.  Therefore, the correct option is option D.

The organised arrangement of all chemical elements according to the order to increase their atomic number—that is, the total amount of protons within an atomic nucleus—is known as the periodic table, or full periodic chart of the elements. When chemical substances are grouped in this way, a recurring pattern in their properties known as the "periodic law" occurs.

Where substances within the same row (group) exhibit comparable qualities. Dmitry I. Mendeleyev's original discovery, whose was made in the middle of the 19th century, has had immeasurable significance for the advancement of chemistry. Noble gases is the periodic family which has a full outermost valence shell and rarely reacts with other element.

Therefore, the correct option is option D.

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Answer:

False

Explanation:

the number of collisions between particles decreases as there is less energy amid the particles

:)

Answer:

protons-50

Neutrons-75

protons are 50, neutrons are 75

Answer:

81.9%

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

N2 + 3H2 —> 2NH3

Next, we shall determine the mass of H2 that reacted and the mass of NH3 produced from the balanced equation. This is illustrated below:

Molar mass of H2 = 2 ×1 = 2 g/mol

Mass of H2 from the balanced equation = 3 × 2 = 6 g

Converting 6 g of H2 to kg, we have:

1000 g = 1 kg

Therefore,

6 g = 6 g × 1 kg /1000 g

6 g = 0.006 kg

Molar mass of NH3 = 14 + (3×1) = 17 g/mol

Mass of NH3 from the balanced equation = 2 × 17 = 34 g

Converting 34 g of NH3 to kg, we have:

1000 g = 1 kg

Therefore,

34 g = 34 g × 1 kg / 1000 g

34 g = 0.034 Kg

Summary:

From the balanced equation above,

0.006 kg of H2 reacted to produce 0.034 kg of NH3.

Next, we shall determine the theoretical yield of NH3. This can be obtained as follow:

From the balanced equation above,

0.006 kg of H2 reacted to produce 0.034 kg of NH3.

Therefore, 6.29 kg of H2 will react to produce = (6.29 × 0.034)/0.006 = 35.64 Kg of NH3.

Thus, the theoretical yield of NH3 is 35.64 kg.

Finally, we shall determine the percentage yield of NH3 as shown below:

Actual yield of NH3 = 29.2 kg

Theoretical yield of NH3 = 35.64 kg

Percentage yield of NH3 =?

Percentage yield = Actual yield /Theoretical yield × 100

Percentage yield = 29.2/35.64 × 100

Percentage yield of NH3 = 81.9%

Answer:

B.  melting point

Explanation:

The melting point is the same as the freezing point.  This temperature is when a liquid freezes and becomes a solid, and it is also when a solid melts and becomes a liquid.  This is why freezers are set at temperatures lower than the freezing point of water.

Answer:

boiling point

Explanation:

hope this helps

Answer:

Screening

Explanation:

Screening is usually done in large amounts.

Thanks!!

Answer:

Detail is given below.

Explanation:

Electronic configuration:

[He] 2s² 2p⁵

Number of electron in given atom:

we know that the atomic number of helium is 2 it means it has 2 electron.

Thus the number of electron in given atom are 2+2+5 = 9

Symbol of atom:

The number of electron is the atomic number of an atom. Thus it means the given atom has atomic number 9 which is fluorine.

Symbol = F

Properties of fluorine:

1. it is yellow in color.

2. it is flammable gas.

3. it is highly corrosive.

4. fluorine has pungent smell.

5. its reactions with all other elements are very vigorous except neon, oxygen, krypton and helium.  

How many 2s electrons are in atom?

There are 2 electron are present in 2s subshell of fluorine.

Answer:

See explanation

Explanation:

Even though the question is incomplete, but I believe you want to know the Lewis acid and Lewis base in the reaction; AlBr3+NH3⇌H3NAlBr3.

A Lewis acid is a lone pair acceptor while a Lewis base is a lone pair donor.

If we look at the reactants, AlBr3 has an open sextet hence it must be a lone pair acceptor ( a Lewis acid). NH3 is a lone pair donor owing to the lone pair present on nitrogen atom, hence it a Lewis base.

The reaction can be classified as a an acid-base reaction according to the Lewis definition of acids and bases.

The missing diagrams are shown in the diagrams attached below.

Answer:

Explanation:

The reaction of Lithium Aluminium hydride LiAlH4 with Alkanone leads to the formation of secondary alcohol products. This is because Lithium Aluminium hydride LiAlH4 acts as a reducing agent. The reaction of NaBH4 in CH3OH with Alkanone is less reactive as compared with Lithium Aluminium hydride LiAlH4, thus it also reduces aldehydes and ketones. From the image attached below, we will see the missing diagram and the mechanism used in the process for the formation of those products.

Answer:

[tex]\Pi=146.3atm[/tex]

Explanation:

Hello.

In this case, since the osmotic pressure is computed via:

[tex]\Pi =i*c*RT[/tex]

Whereas the van't Hoff's factor of calcium acetate (molar mass = 158.17 g/mol) is 3 as it dissociates in one calcium ion and two acetate ions, the concentration is:

[tex]c=\frac{345g*\frac{1mol}{158.17g} }{1.2L}=1.82mol[/tex]

Therefore, the osmotic pressure is:

[tex]\Pi =3*1.82mol*0.082\frac{atm*L}{mol*K}*(54+273.15)K\\\\\Pi=146.3atm[/tex]

Best regards!

Answer:

c

Explanation:

c