How much heat must be removed from 75.0 g of water at 90.0°C to cool it to 23.0°C?

Answer:

1. yes

2. yes

3. no

sorry if wrong but hope this helps

Answer:

Diffusion is the movement of a substance from an area of high concentration to an area of lower concentration

hope this helps!!!

Molar mass of 2H2, O2 and 2H2O is 4g, 32g and 36 g per moles respectively.

That is , 4g of H2 = 36g of water

250g of H2 = xg of water

Make xg the subject of formula,

xg = 250× 36/4

xg = 9000/4

xg = 2250g of water

Molar mass of 2H2, O2 and 2H2O is 4g, 32g and 36 g per moles respectively.

32g of oxygen = 36g of water

250g of oxygen = xg of water

Make xg the subject of formula,

xg = 250 × 36/32

xg = 9000/32

xg = 281.25g of water

C3H8(g)+5O2(g)→3CO2(g)+4H2O(g).

Molar mass of propane and water is 44g and 72g per mole.

if 44g of propane = 72 g of water

xg of propane = 1000g of water

make xg the subject of formula,

xg = 44 × 1000/72

xg = 44000/72

xg = 611g of propane

2 H2O → 2H2 + O2

Molar mass of 2H2O and 2H2 is 36g and 4g respectively.

If 36g of water = 4g of Hydrogen

xg of water = 150 g of hydrogen

Make xg the subject of formula,

xg = 36×150/4

xg = 5400/4

xg = 1350g of water

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Answer:

Yes. Diesel works the best.

Explanation:

Homemade Napalm can be made using the following procedures; Using an enormous container, fill it about halfway with gasoline. Which means Diesel works the best. Break the special soap, Styrofoam(polystyrene), plate into small pieces.

Answer:

1. Conduction

2. Convection

Explanation:

1. Conduction is the transfer of energy from one end of something to the other. Since the pad is heating up your back and no fluids or gasses are involved it is conduction.

2. Convection is the transfer of energy through air. Since the air is transferring its energy to the ice it is convection.  

Answer:

The primary function of chemical nomenclature is to ensure that a spoken or written chemical name leaves no ambiguity concerning which chemical compound the name refers to: each chemical name should refer to a single sub

Answer:

The problem provides you with the solubility of potassium chloride,

KCl

, in water at

20

∘

C

, which is said to be equal to

34 g / 100 g H

2

O

.

This means that at

20

∘

C

, a saturated solution of potassium chloride will contain

34 g

of dissolved salt for every

100 g

of water.

As you know, a saturated solution is a solution that holds the maximum amount of dissolved salt. Adding more solid to a saturated solution will cause the solid to remain undissolved.

In your case, you can create a saturated solution of potassium chloride by dissolving

34 g

of salt in

100 g

of water at

20

∘

C

.

Now, your goal here is to figure out how much potassium chloride can be dissolved in

300 g

of water at this temperature. To do that, use the given solubility as a conversion factor to take you from grams of salt to grams of water

Answer:

0.42 moles Na₂O

Explanation:

Molarity: 1.2 M

Volume (mL): 350 mL

Volume (L): 0.35 L

350 mL / 1,000 mL = 0.35 L Na₂O

Molarity (M) =  moles / liters (L)

1.2 M Na₂O = ? moles / 0.35 L Na₂O

(1.2 M Na₂O) x (0.35 L Na₂O) = ? moles

? = 0.42 moles Na₂O

Answer:

12.82 liters

Explanation:

From periodic chart ...mole weight of neon = 20.1797 gm/mole

23 g / 20.1797 g/mole = 1.14 moles

PV = n R T          R = gas constant = .082057 L-Atm / K-mole

                            n = 1.14

                             T = 1 C = 274.15 K

2 * V = 1.14 * .082057 * 274.15     Solve for V = 12.82 liters

The heat required to form 1 mole of carbon dioxide from carbon and oxygen is 393.5 kJ/mol.

Enthalpy of formation of a substance is the heat required to form 1 mole of a substance from its reactants.

Carbon reacts with oxygen to produce carbon dioxide.

The enthalpy of formation of carbon dioxide is -393.5 kJ/mol.

Therefore, the heat required to form 1 mole of carbon dioxide from carbon and oxygen is 393.5 kJ/mol.

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Answer:

The actual yield is 38.59g of NaCl

Explanation:

Balanced equation: 2Na+CI2-->2NaCl

actual yield= (percent yield*theoretical yield)/100

Theoretical yield= 

17.25*(1/22.989769)*(2/2)*(58.442769)=43.8515

43.8515*0.88=38.59 grams of NaCl

The actual yield is 38.59g of NaCl

The theoretical yield of the reaction is obtained as 43.87 g. The percentage yield is given 88%. Then, the actual yield is 38.6 g.

The percentage yield in a reaction is the  ratio of actual yield to the theoretical yield multiplied by 100. The balanced chemical equation equation of the reaction is :

[tex]\rm 2Na + Cl _{2} \rightarrow 2NaCl[/tex]

Atomic mass of Na = 23 g

2 Na = 46 g

molar mass of NaCl = 58.5 g

2 NaCl = 117 g.

46 g of sodium metal gives 117 g of NaCl. Hence, the mass of NaCl produced from 17.25 g of Na is :

(17.25 × 117) /46 = 43.87 g

Thus the theoretical yield of the reaction is 43.87 g.

The percentage yield  = 88%

Hence, actual yield / theoretical yield  = 0.88

Actual yield = 0.88 × 43. 87 = 38.6 g.

Therefore, the actual yield of the reaction is 38.6 g.

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Answer:

In chemistry, orbital hybridisation (or hybridization) is the concept of mixing atomic orbitals into new hybrid orbitals (with different energies, shapes, etc., than the component atomic orbitals) suitable for the pairing of electrons to form chemical bonds in valence bond theory. Hybrid orbitals are very useful in the explanation of molecular geometry and atomic bonding properties and are symmetrically disposed in space. Although sometimes taught together with the valence shell electron-pair repulsion (VSEPR) theory, valence bond and hybridisation are in fact not related to the VSEPR model.

Answer:

.853 M

Explanation:

(72.1 g / 342.3 g/mole) / (246.8 ml /1000 ml/l )= .853 M

Answer:

the answer is atmospheric carbon dioxide

Explanation:

The presence of carbon dioxide in atmosphere warms the planet and causes the climate change. Human activities have raised the atmospheric CO₂ content. Here atmospheric carbon dioxide is the planetary health measures which humans already exceeded. The correct option is C.

The planetary health measures offers a way to understand the relationship between human health and the environmental sustainability. The global environmental degradation and climate change threaten the foundation of human health and well being.

Carbon dioxide is an important greenhouse gas that comes from the burning of fossil fuels like coal or oil which traps heat. The increased level of CO₂ in the atmosphere causes greenhouse effect and it does not allow hot rays of the sun to escape from the atmosphere.

The increased level of CO₂ also causes the global warming which increases the temperature of the earth.

Thus the correct option is C.

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Answer:

Carbohydrates

Explanation:

Carbohydrates are organic compounds that contain only carbon, hydrogen, and oxygen. They are the most common of the four major types of organic compounds. There are thousands of different carbohydrates, but they all consist of one or smaller units called monosaccharides.

Answer:

See below ~

Explanation:

Answer:

CH3NH2 + H2O = CH3NH3 + OH - Balanced Chemical Equation

Explanation:

CH3NH2- BASE

H20- both

CH3NH3- ACID

OH- BASE

Answer:

The solubility graph is a very useful tool because it tells you the amount of potassium nitrate that can be dissolved per

100 mL

of water in order to have a saturated solution of potassium nitrate at a given temperature.

In order to find the solubility of the salt at

60

∘

C

, start from the

60

∘

C

mark on the graph and move up until you intersect the curve. At the point of intersection, move left until you intersect the

y

axis and read off the value that you land on.

In this case, you can estimate that the solubility of potassium nitrate in water at

60

∘

C

is equal to about

Answer:

electric charge

Explanation:

Answer:

A. Low pressure system

Explanation:

A low pressure system allows for more cloud development. I think of it as in, since the clouds have low pressure on them they can do whatever they want but if the clouds have a high pressure on them, they tend to not do much and most of the time not even form.  

I hope this helps, good luck :)

Answer: I believe the answer is B

Explanation:

because over time sediment breaks down

Answer:

see below

Explanation:

tetonic plate movement is gradual...then there is suddenly an eathquake to relieve pressures in the plates

Answer:

An innate, typically fixed pattern of behavior in animals in response to certain stimuli.

0.72 L and 2.28 L of 1/5 M and 1/8 M HCl solution are required respectively to obtain 3 L of 1/7 M HCl.

The concentration of a solution is the amount of substance a given volume of the solution of that substance.

The final concentration and volume of the mixture is 3 L of 1/7 M HCl.

Let the volume of 1/5 M and 1/8 M HCl solution required be X and Y respectively.

X + Y = 3 L

Liters of y = 3 -

[.0.2 X + 0.125 * (3-X)] / 3 = 1/7

(0.2X + 0.375 - 0.125X) / 3 = 1/7

(0.075 X / 3) = 1/7 - 0.375/3

(0.075X / 3) = 0.018

Multiplying both sides by 3

0.075 X = 0.054

X = 0.72 L

Y = 2.28 L

Therefore, 0.72 L and 2.28 L of 1/5 M and 1/8 M HCl solution are required respectively.

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Answer:

D. A plastic cup

I would perfer to prefer to live my dream forever because I wouldn't let someone be stuck with my dream forever because I would rather tourture my self other than to toutour everybody else.

I would rather let everyone else live their dream, because living a dream forever after a certain point would get boring, no matter how fun it seems. Additionally, just because I sacrifice me having my dream doesn't mean I wouldn't be able to enjoy life. It just means that I wouldn't be able to live out my best scenario.

Identified substance which is present in the sample of 55.5g is calcium, because the calculated and actual specific heat is almost same.

Relation between the amount of absorbed heat and specific heat of any substance is shown by following equation:

Q = mcΔT, where

On putting all these values on the above equation, we get

c = 500 / (55.5)(14) = 0.643 J/g. degrees Celsius

And this value is almost equal to the given specific heat value of calcium, so the given substance is calcium.

Hence the given unknown substance is calcium.

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Answer:

P + O2 --> P2O5

Explanation:

For a simple match burning you can use the following equation: P + O2 --> P2O5 To balance the reaction you have to make sure you have the same amount of each element on both sides.