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DIMENSIONAL ANALYSIS CHEMISTRY SUPER easy MOLE CONVERSIONS!!

Question : How many moles of O2 are in the sample of 3.6 kilograms of air if 21% of the air is oxygen O2 by mass?

Answer:

[tex]2Na + Ca^{2+} \rightarrow Ca + 2Na^+[/tex]

Explanation:

Hello!

In this case, since this a reaction in which the oxidation state of the metals is changing, we need to apply a redox method for which:

[tex]Na\rightarrow Na^++e^-\\\\Ca^{2+}\rightarrow Ca+2e^-\\\\\\2Na\rightarrow 2Na^++2e^-\\\\Ca^{2+}\rightarrow Ca+2e^-[/tex]

Thus, the result is:

[tex]2Na + Ca^{2+} \rightarrow Ca + 2Na^+[/tex]

Regards!

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:

That is the Atomic mass

Explanation:

The element symbol is S, Element name is sulfur, and

Atomic number is 16

Answer:

1683

Explanation:

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

Answer:

∆H = - 450 kJ/mol

Explanation:

You can calculate the change in enthalpy provided we have the heat of solution (q). That would be the only approach to this problem. But this approach is only possible if we have a specific set-up; we would have to use a calorimeter. So then the reactants are taken as the system, and water as the surroundings. When calculating q, the heat of the solution, we take 4.18. Remember that heat is flowing from the reaction mixture, to the water, from the system to surroundings, so it's exothermic and ∆H = negative:

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).

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]

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:

ecosystem:a biological community of interacting organisms and their physical environment.

rainforest: a luxuriant, dense forest rich in biodiversity, found typically in tropical areas with consistently heavy rainfall.

major part of rain forest:Most rainforests are structured in four layers: emergent, canopy, understory, and forest floor. Each layer has unique characteristics based on differing levels of water, sunlight, and air circulation.

coral reefs :a ridge of rock in the sea formed by the growth and deposit of coral.

type of coral reefs:fringing reefs, barrier reefs, atolls, and patch reefs

Explanation:

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Explanation:

Answer:

electrical

Explanation:

they are working together

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:

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 .

Answer: A. Earth is an inner planet with a solid rock surface composition, while Jupiter is an outer planet with a gas surface composition.

Answer: What a main difference between Earth and Jupiter?

Earth is an inner planet with a solid rock surface composition, while Jupiter is an outer planet with a gas surface composition.

Earth is an inner planet with a relatively long distance from the sun, while Jupiter is an outer planet with a relatively short distance from the sun.

Earth is an outer planet with a gas surface composition, while Jupiter is an inner planet with a solid rock surface composition.

Earth is an outer planet with a relatively short distance from the sun, while Jupiter is an inner planet with a long distance from the sun.

Explanation:

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:

Pulse-code modulation

Explanation:

Answer:

false

Explanation:

An electric field may do work on a charged particle, while a magnetic field does no work.

Answer:

False

Explanation:

Freshwater habitats include ponds, lakes, rivers, and streams, while marine habitats include the ocean and salty seas.

Answer:

true............,....

Answer:False

Explanation:

This statement is false. Correct statement: Photosynthesis produces glucose and oxygen. ... In this process, plants produce glucose and oxygen from carbon dioxide and water in the presence of sunlight. Photosynthesis converts light energy into chemical energy.

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 and Explanation:

It is not necessary to know the amount of salt in the aqua, because we know that the presence of salt in the water will increase its density.

In this case, salt increases the mass of the water, without increasing the volume of water. as the egg will not change in volume or water, we know that the density of the egg will be constant, while the change in the mass of the water with the addition of salt, will change the density of the water which will increase progressively until it becomes denser than the egg and, consequently, it will not let the egg sink.

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:

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Answer:

The oxidation state of the reducing agent has changed from 0 to +2.

Explanation:

reducing agent is anything that loses electron or gains oxygen

in this case, zinc

Answer:

1. Percentage yield = 57.2%

2. Percentage error = 74.9%

Explanation:

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

Actual yield = 5.06 g

Experimental yield = 8.85 g

Percentage yield =?

Percentage error =?

1. Determination of the percentage yield.

Actual yield = 5.06 g

Experimental yield = 8.85 g

Percentage yield =?

Percentage yield = Actual yield /Experimental yield × 100

Percentage yield = 5.06 / 8.85 × 100

Percentage yield = 57.2%

2. Determination of the Percentage error.

Actual yield = 5.06 g

Experimental yield = 8.85 g

Percentage error =?

Percentage error = |Experimental – Actual| / Actual yield × 100

Percentage error = |8.85 – 5.06| / 5.06 × 100

Percentage error = 3.79 / 5.06 × 100

Percentage error = 74.9%

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:

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

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

Explanation:

Answer:

Fe + H(C2H3O2) ........