Please solve this i will mark brainlist

Answer:

[tex]Q=-15.3kJ[/tex]

Explanation:

Hello!

In this case, since the enthalpy of vaporization is the contrary of the enthalpy of condensation, we have:

[tex]\Delta _{cond}H=-\Delta _{vap}H=-38.0kJ/mol[/tex]

Now, we convert the grams of CH3OH to moles:

[tex]n=12.9g*\frac{1mol}{32.05g}=0.402mol[/tex]

Thus, we compute the energy as shown below:

[tex]Q=n*\Delta _{cond}H=0.402mol*-38.0\frac{kJ}{mol}\\\\Q=-15.3kJ[/tex]

Which means 15.3 kJ of energy must be back down from the system.

Best regards!

Enthalpy is the measure of the energy that is not available to work. 15.27 kJ of energy is needed to condence 12.9 g of methenol.

Enthalpy:

It is the measure of the energy that is not available to work. It is denoted by [tex]\bold{ \Delta H}[/tex].

The energy of a system can be calculated by the formula,

[tex]\bold{Q = n \times \Delta H}[/tex]

Where,

Q - energy( in kJ)

n - Number of moles

[tex]\bold{ \Delta H}[/tex] - enthalpy

Given here,

[tex]\bold{CH_3OH = 12.9 g}[/tex]

[tex]\bold{\Delta Hvap = 38.1 kJ/mol}[/tex]

molar mass of the [tex]\bold{CH_3OH}[/tex] -

The number of moles of [tex]\bold{CH_3OH}[/tex]

[tex]\bold{n = \frac{w}{m}}\\\\\bold{n = \frac{12.9}{32.03}} \\\\\bold{n = 0.402}[/tex]

Put the values in the formula,

[tex]\bold{Q = 0.402\times 38.0}\\\\\bold{Q =15.27 }[/tex]

Therefore, the 15.27 kJ of energy is needed to condense 12.9 g of methenol.

To know more about Enthalpy, refer to the link:

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Answer:

hmm i dont know but i can try mate!

Answer:

They both have 7 electrons in their outer shell

Answer:Through Direct or indirect contact with an infected person or animal, through air or contaminated food and water.

Explanation:

Answer:

The word “organic” refers to how a food is grown. ... However, without preservatives and fewer chemicals than regular produce, you might notice that organic foods taste fresher.

Answer:

The phrase hear, hear seems to have come into existence as an abbreviation of the phrase hear him, hear him, which was well-established in Parliament in the late seventeenth century. ... When you say hear, hear, you are in fact saying that you agree with something another person has just said.

Explanation:

hope it's help you

Answer:

Pulse-code modulation

Explanation:

1.54 × 10²⁴ atoms He

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[Given] 2.56 moles He

[Solve] atoms He

Step 2: Identify Conversion

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

1.54163 × 10²⁴ atoms He ≈ 1.54 × 10²⁴ atoms He

Answer:

Li2S

Explanation:

Hope this helps.

Answer:

can u do an real answer pls so i can help u thanks

Explanation:

Heat transfer by radiation tends to be minimal in many everyday instances. This is in part, due to the 4th power exponentiation of the heat transfer equation that governs radiative heat transfer.

For instance, a bar of metal of 75 ºF will interact with your body, from a distance, when your body is at 98 ºF. But the temperature difference of 14 ºF will be so low, that it is difficult to feel or detect. However, if that bar was heated to 120º F and set close to you, you may begin to feel the heat from radiation. Then, if the bar was heated to the point that it began to glow red, several hundred degrees, not only would you feel it, but it may make you uncomfortably hot very quickly. If it was then heated to being white hot, you would almost certainly be burned by it, not by touching it, but simply by the radiative heat transfer. Again, its the 4th power exponent that really makes radiative heat transfer a powerful force when the temperature increases to a high level.

Another example from a text that I once used set an example of a person in a room with their body temperature at 98 ºF. In one case, the walls of the room surrounding the body are said to be 50º F, but in the other case, the walls are said to be 100º F. In both cases, the air in the room is said to be 75ºF. The question is asked: why is the person colder in the room with 50 ºF walls, when the air is the same temperature in both cases.

The answer is that the 100 ºF walls are acting to slightly warm the body, whereas the 50º F walls are actually taking heat away from the body by way of radiative heat transfer. You can do the equations to see exactly how much the different temperatures of the walls will effect this situation.

One final example - if you look into a thermos, you will see a highly reflective liner inside of the thermos. This is a radiant barrier, and it is put into the thermos to keep the liquid inside from losing heat by way of radiation. The reflective film will transfer back most of the heat that would otherwise be lost by radiating to the outer surface of the thermos, after which it would conduct through the side of the thermos. So a thermos provides a good example of a solution for heat transfer in the form of radiation.

Answer:

I would not accept it.

Explanation:

Although it is tempting to accept the janitor's offer and save the scholarship, which is not easy to get, I would not accept his offer, as I do not believe in victories based on dishonesty and would be heavy on conscience if I did the opposite. Obviously, I would not like to lose my scholarship and for that reason, I would look for other ways that would be honest and help me improve my grade. If I could not improve and lose the scholarship, I would be extremely sad, but I would be at peace with my conscience.

Answer:

B. Farming

Explanation:

Answer:

See explanation

Explanation:

In electrophillic aromatic substitution, an electrophile attacks the aromatic ring and resonance structures are created.

We know that the nature of the substituents already present in the ring determines the position to which the incoming substituent is directed.

-OCH3 is an ortho-para director. If the -OCH3  is present at position 1 and the ring is brominated at position 4, the resonance structures shown in the image attached are observed.

Answer:

2.67 M

Explanation:

Molarity, which is the molar concentration of a substance, can be calculated using the formula;

M = n/V

Where;

M = molarity (M)

n = number of moles (mol)

V = volume (Litres)

Based on the provided information in this question, mass of lithium sulfate (Li2SO4) = 734g, volume = 2.5L

Using mole = mass/molar mass

Molar mass of Li2SO4 = 7(2) + 32 + 16(4)

= 14 + 32 + 64

= 110g/mol

Mole = 734/110

Mole (n) = 6.67moles

Molarity = n/V

Molarity = 6.67/2.5

Molarity = 2.668

Molarity of Li2SO4 in the solution is 2.67 M

Answer:

The molarity of the solution is 2.672[tex]\frac{moles}{liter}[/tex]

Explanation:

Molarity (M) is a way of expressing the concentration of solutions. It is defined as the number of moles of solute per volume of solution. The Molarity of a solution is determined by the following expression:

[tex]Molarity=\frac{number of moles}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

Being the molar mass of Li₂SO₄ 109.94 g/mol, then you can apply the following rule of three: if 109.94 grams are present in 1 mole, 734 grams will be present in how many moles?

[tex]amount of moles=\frac{734 grams*1 mole}{109.94 grams}[/tex]

amount of moles= 6.68 moles

Then:

Replacing in the definition of molarity:

[tex]Molarity=\frac{6.68 moles}{2.5 L}[/tex]

and solving you get:

Molarity= 2.672[tex]\frac{moles}{liter}[/tex]

The molarity of the solution is 2.672[tex]\frac{moles}{liter}[/tex]

Answer:

Classifications according to mandatory, discretionary, or originator controlled policy, or a combination thereof:

a. Mandatory

b. Originator

c. Discretionary

d. Mandatory and Originator combined

Explanation:

a) Mandatory control means that access to the UNIX operating system is restricted.

b) Originator controlled policy implies that the memorandum cannot be distributed without the author's consent or permission.

c) Discretionary means that only certain authorized users, for example, generals, can access the particular room.

d) Combined Mandatory and Originator means that while access is restricted to some people, the originator's consent is still required before access can be granted to the faculty member.

Answer:

Explanation:

scheelite is CaWO₄

Mol weight = 288

80 g of scheelite = 80 / 288 = 27.77 x 10⁻² moles

27.77 x 10⁻² moles of scheelite = 27.77 x 10⁻² x 6.02 x 10²³  molecules of scheelite

= 167.17 x 10²¹ molecules of scheelite

1 molecule of scheelite contains 4 atoms of oxygen

167.77 x 10²¹ molecules of scheelite contains 4 x 167.77 x 10²¹ atoms of oxygen .

= 671.08 x 10²¹ atoms of oxygen .

= 671 x 10²¹ atoms .

Explanation:

The equation is given as;

N2O(g) ⇄ N2(g) +  O(g)

k₁ = Forward reaction

k₋₁ = Reverse Reaction

Equilibrium concentration (K) = k₁ / k₋₁

[tex]K = \frac{[N2O] }{[N2] [ O]}[/tex]

Answer:

True.

Explanation:

When the number of molecules, atoms or ions of any element is in the hundreds of millions, we can safely speak of concentrations and analyze a standard behavior, and can even specify the different dilutions used, if there are dilutions. This allows analyzes to be clearly understood by any individual. However, it is not possible to do this if the number of molecules, atoms and ions is very small.

Answer:

7.19g of fertilizer are required to provide 2.20g of N to a plant

Explanation:

In 100g of fertilizer, the amount of nitrogen could be obtained as follows using the ratio of molar mass of nitrogen*atoms of nitrongen / molar mass of the molecule:

CH4N2O = 53.2g * (14g/mol*2 / 60.06g/mol) = 24.8gN

KNO3 = 24.1g * (14g/mol*1 / 101.10g/mol) = 3.3g N

(NH4)2HPO4 = 11.8g * (14g/mol*2 / 132.06g/mol) = 2.5g N

The mass of nitrogen in 100g of fertilizer is 24.8g + 3.3g + 2.5g = 30.6g N

That is: 30.6g N / 100g of fertilizer.

To obtain 2.20g of nitrogen are required:

2.20g N * (100g Fertilizer / 30.6g N) =

Answer:

0.30 L

Explanation:

First we convert 75.0 g of Al₂(SO₄)₃ into moles, using its molar mass:

Then we can calculate the volume of the solution, by using the definition of molarity:

We solve for Volume:

Answer:

1683

Explanation:

i did that game a few weeks ago preeeettyyyyyyyy sure that's the right number

Answer:

630.95 grams of Na₂CO₃ would be needed to produce 1000g of NaHCO₃

Explanation:

The balanced reaction is:

Na₂CO₃ + CO₂+ H₂O → 2 NaHCO₃

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:

Being the molar mass:

Then by stoichiometry the following quantities of mass participate in the reaction:

You can apply the following rule of three: if 106 grams of Na₂CO₃ are needed to produce 168 grams of NaHCO₃, how much mass of Na₂CO₃ is necessary to produce 1000 grams of NaHCO₃?

[tex]mass of Na_{2} CO_{3}=\frac{1000grams ofNaHCO_{3} *106gramsofNa_{2} CO_{3} }{168grams ofNaHCO_{3}}[/tex]

mass of Na₂CO₃= 630.95 grams

630.95 grams of Na₂CO₃ would be needed to produce 1000g of NaHCO₃

The types of tissues that you think humans might have that are similar to plant’s vascular tissues - is connective tissues of circulatory tissues.

A plant's vascular tissues transport nutrients throughout the plant, just as the circulatory system transports nutrients throughout the human body.

Connective tissue in the human :

Thus, the types of tissues that you think humans might have that are similar to plant’s vascular tissues - is connective tissues of circulatory tissues.

Learn more about the circulatory system:

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Answer:4.2 6.4 6.7 9.5 5.5 3.8

Explanation:

Answer:

Hellium (He): 1s2

Nitrogen (N): 1s2 2s2 2p6

Silicon (Si): 1s2 2s2 2p6 3s2 3p2

The orbital configuration of following elements is as follows:i) helium- 1 s² ii)nitrogen- 1 s² 2 s²  2 p³ iii)silicon-1 s² 2 s² 2 p⁶ 3 s² 3 p²

It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.

Learn more about elements,here:

https://brainly.com/question/14347616

#SPJ2

Answer:

See explanation

Explanation:

Basically, phosphorolysis involves the cleavage of a bond by adding phosphoric acid across the bond, while hydrolysis involves the cleavage of a bond by adding water across the bond.

The phosphorolytic cleavage of glycogen is energetically advantageous because the released sugar is already phosphorylated. In contrast, a hydrolytic cleavage would yield glucose, which would then have to be phosphorylated at the expense of the hydrolysis of a molecule of ATP to enter the glycolytic pathway(Biochemistry, 5th ed, Jeremy M Berg et al, 2002).

Answer:

Highest temperature which was recorded in Texas was 40 degrees.

Explanation:

Texas has variating weather. In summer Texas city turns to be very hot and during winters the city of Texas experience fall in temperature. There is very few rainfall in Texas due the climatic conditions.

Answer:

C6H14O3F

Explanation:

The first step is to divide each compound by its molecular weight

Carbon

= 39.10/12

= 3.258

Hydrogen

= 7.67/1

= 7.67

Oxygen

= 26.11/16

= 1.63

Phosphorous

= 16.82/31

= 0.542

Flourine

= 10.30/19

= 0.542

The next step is to divide by the lowes value

3.258/0.542

= 6 mol of C

7.67/0.542

= 14 mol of H

1.63/0.542

= 3 mol of O

0.542/0.542

= 1 mol of P

0.542/0.542

= 1 mol of F

Hence the molecular formula is C6H14O3F