why do crystals form during crystallisation

The weight of water produced from the complete reaction of 12.25 moles of Hydrogen is  73.5 g water

Hydrogen can be used in fuel cells to generate electricity, or power and heat.

Today, hydrogen is most commonly used in petroleum refining and fertilizer production, while transportation and utilities are emerging markets.

As according to given chemical equation,

3 moles of H₂ produces 1 mole (18 g) of water

Therefore,

The weight of water produced by 12.25 mole of hyrdogen will be ;

                                                            =  18 / 3 x 12.25 =  73.5 g water

Hence , The weight of water produced from the complete reaction of 12.25 moles of Hydrogen is  73.5 g water

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Answer:

101.18 grams

Explanation:

From the equation you can see that the same number of MOLES will be required as MOLES of aluminum chloride produced.

Mole weight of aluminum chloride = 26.981 + 3 * 35.45 = 133.331 gm

     500 gms of this is then    500 / 133.331 = 3.75 moles

So you need 3.75 moles of aluminum

    3.75 moles * 26.981 g/mole = 101.18 grams of Al

101.07 grams of aluminum (Al) are required to produce 500 grams of aluminum chloride (AlCl₃) according to the given chemical equation.

Mass is a fundamental physical property of matter that represents the amount of substance contained in an object. It is a measure of the total amount of matter or material in an object, and it is typically measured in units such as grams (g) or kilograms (kg).

Molar mass, also known as molecular mass or formula mass, is the mass of one mole of a chemical substance. It is usually expressed in grams per mole (g/mol). Molar mass is a fundamental concept in chemistry that allows scientists to relate the mass of a substance to the number of moles it contains.

The balanced chemical equation is:

2Al + 3Cl₂ → 2AlCl₃

From the balanced equation, 2 moles of aluminum (Al) react with 3 moles of chlorine gas (Cl₂) to produce 2 moles of aluminum chloride (AlCl₃).

Molar mass of Al = 26.98 g/mol

Molar mass of Cl = 35.45 g/mol

Molar mass of AlCl₃ = 2 × (26.98 g/mol) + 3 × (35.45 g/mol)

= 133.34 g/mol

moles of AlCl₃ = mass / molar mass

moles of AlCl₃ = 500 g / 133.34 g/mol

= 3.749 moles

In the reaction, 2 moles of Al react to produce 2 moles of AlCl₃.

Therefore, moles of Al = moles of AlCl₃

moles of Al = 3.749 moles

Step 4: Calculate the mass of Al required:

mass of Al = moles of Al × molar mass of Al

mass of Al = 3.749 moles × 26.98 g/mol

= 101.07 g

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2)A complete desktop uses an average of 200 Watt hours (Wh). This is the sum of the average consumption per hour of the computer itself (171 W), the internet modem (10 W), the printer (5 W) and the loudspeakers (20 W). Assuming that a computer is on for eight hours a day, the annual consumption comes to 600 kWh. That corresponds to CO2 emissions of about 175 kg per year, i.e. 1.75 % of the average annual emission of a Belgian.

Moles of benzene

moles of CCl_4

Now

[tex]\\ \rm\Rrightarrow \chi_{C_6H_6}[/tex]

[tex]\\ \rm\Rrightarrow \dfrac{\chi_{C_6H_6}}{\chi_{sol^n}}[/tex]

[tex]\\ \rm\Rrightarrow \dfrac{0.8}{0.8+0.2}[/tex]

[tex]\\ \rm\Rrightarrow \dfrac{0.8}{1}[/tex]

[tex]\\ \rm\Rrightarrow 0.8[/tex]

how are we (brainly users) supposed to know. unless its just me that doesn't know.

sorry that this isn't really much help. :/

Answer:

a

Explanation:

from pH of 0-6 is acidic and 7 is neutral above 7 is basic or alkali

Answer:

See below

Explanation:

Tap water, bottled water and lake water are all examples of FRESH WATER and likely have the same specific gravity  ( or density) .

Ocean water is SALT WATER ....and depending on HOW MUCH salt is in the water, it can be quite a bit denser than fresh water ...which will allow the golf ball ( which is less dense)   to float .

Answer:

the answer is hormone

Explanation:

because it is

The amount of carbon flux in the atmosphere will be 3.3 GtC/yr

The carbon flux in the atmosphere can be calculated by:

1. Removing the amount of carbon that leaves the atmosphere from the amount that enters the atmosphere.

2. Adding the amount of carbon released by fossil fuel burning.

Thus,

Carbon flux = 211.6 - 213.8 + 5.5 = 3.3 GtC/yr

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In the given heating curve, Particles of the substance have the most kinetic energy when the substance is (a) 1. A gas. The part of the graph that represents where the substance has the least amount of potential energy is labeled (b) 1. Solid.

The heating curve is the relationship between the heating system supply temperature and the outside air temperature.

Gas molecules have the highest average velocities among the three states of matter so gas has the highest kinetic energy.

During freezing, a substance loses a lot of potential energy so solid has the least potential energy.

Hence, In the given heating curve, Particles of the substance have the most kinetic energy when the substance is (a) 1. A gas.

The part of the graph that represents where the substance has the least amount of potential energy is labeled (b) 1. Solid.

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Answer:

8800  cm / s

Explanation:

There are 100 cm / m

  so:    88 m/s  * 100 cm / m =   8800 cm/s  

                     ( see how the 'm' cancels out and you are left with cm /s ?)

Answer: D

Explanation:

Reduction involves the gaining of electrons.

However, charge must be balanced, and this is not the case for choice B, but it is the case for choice D

Answer:

smallest whole number ratios of atoms

Answer:

Explanation:

Solution

Verified by Toppr

2 molL

−1

Explanation :

Concentration =

Volume of solution

Moles of solute

We assume that potassium nitrate dissolves in the given volume of solvent without gross change in volume.

Concentration =

101.10gmol

−1

404g

Answer:

An energy change occurs during the breaking and forming of bonds.

Explanation:

Answer:

An energy change occurs during the breaking and forming of bonds.

Explanation:

Energy changes occur when bonds are broken or formed.

When a bond is formed, energy is released.

When a bond is broken, energy is stored.

Edge 2022

Thermochemical Reactions Quiz answer

The answer to this question is change in temperature will be 6.1 and specific specific heat capacity of metal will be 1698.36.

According to the formula of Calorimetry

Q = msΔT

where, Q = Quantity of heat absorbed (in joules)

M = Mass of water sample given (in kilogram)

S = specific heat capacity of metal

ΔT = Change in temperature

We have given,

Mass as 25 gram which is equal to 0.025 Kg.

Change in temperature as 6.1

Quantity of heat absorbed as 259 J

Applying to the formula of Calorimetry

Q = msΔT

259 = 0.025 × s × 6.1

s = 1698.36

So, specific heat capacity of metal came out to be 1698.36 and the change in temperature will be 6.1

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Answer: specific heat is 1.7

Explanation:

after you answer this question itll then tell you to find the specific heat

The velocity of the avalanche is 0.04 miles / sec. If the avalanche lasted for 97 seconds and travels 4.5 miles,

Velocity is a vector expression of the displacement that an object or particle undergoes with respect to time .

The standard unit of velocity magnitude (also known as speed ) is the meter per second (m/s). Alternatively, the centimeter per second (cm/s) can be used to express velocity magnitude.

Given ;

Formula used ;

Velocity = Distance / Time

Therefore,

Velocity =  4.5 miles / 97 sec

              = 0.04 miles / sec

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The number of grams of oxygen present in a sample of this compound that contains 40.00 grams of S = 29.9g of oxygen

The compound contains the following:

sulphur = 57.20%

Oxygen= 100 - 57.20 = 42.80%

If 57.20% of the sample contains 40g of sulphur then 42.80% of the sample will contain X.

Make X the subject of formula,

X = 42.8 × 40/57.20

X= 1712/57.20

X= 29.9g of oxygen

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Explanation:

saliva contains and amylase which randomly hydrogen all the one is equal to 4 glycosidic bonds of stars except it's out most bones and those next the branches on the hand glycogen being a highly branched molecule it is evident that amylase won't be a good animal eyes to digest it due to physical structure constance

Translocation can be investigated by using radioactively labelled tracers, which are absorbed into glucose during photosynthesis.

Translocation can be defined as a biological process which involves the transfer (movement) of water and other soluble nutrients from one part of a plant to another, especially through the xylem and phloem.

Generally, translocation can be investigated by using radioactively labelled tracers, which are absorbed into glucose during photosynthesis. Also, an x-ray turns black when exposed to this biological process in plants.

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Answer:

volume = 0.288 L

Explanation:

To find the volume, you need to (1) convert grams LiBr to moles LiBr (via molar mass) and then (2) calculate volume (via molarity equation). It is important to arrange the ratios in a way tat allows for the cancellation of units (desired units in the numerator).

(Step 1)

Molar Mass (LiBr): 6.9410 g/mol + 79.904 g/mol

Molar Mass (LiBr): 86.845 g/mol

100 grams LiBr           1 mole
-----------------------  x  ------------------  =  1.15 moles LiBr
                                  86.845 g

(Step 2)

Molarity (M) = moles / volume (L)

4 M = 1.15 moles / volume

(4 M) x volume = 1.15 moles

volume = 1.15 moles / 4 M

volume = 0.288 L

The substitution product that is supposed to be favoured. The product with retention of configuration is expected to predominate slightly because the leaving group blocks the nucleophile.

A substitution product is a product that is gotten from a reaction in which a group of reactants is replaced by another group in the reaction.

Therefore, the substitution product is supposed to be favoured. The product with retention of configuration is expected to predominate slightly because the leaving group blocks the nucleophile.

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Answer:

P total = 1.25 atm

neon = 0.68 atm

argon= 0.35 atm

helium= x

1.25=0.68+0.35+x

1.25-0.68-0.35=x

x=0.22 atm

Answer:

frequency = 2.07 x 10¹³ Hz

Explanation:

To find the frequency of the photon, you need to use the following equation:

E = hv

In this formula,

-----> E = energy (J)

-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)

-----> v = frequency (Hz)

Since you have been given values for two of the variables (in the correct units), you can plug them into the equation and simplify to find the frequency.

E = hv                                                       <----- General Equation

E = (6.626 x 10⁻³⁴ J*s)v                           <---- Plug in Planck's Constant

1.37 x 10⁻²⁰ J = (6.626 x 10⁻³⁴ J*s)v        <----- Plug in energy (given)

2.07 x 10¹³ = v                                        <----- Divide both sides by 6.626 x 10⁻³⁴

Answer:

A) photon

Explanation:

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Answer:

Explanation:

After reducing the starting volume, the gas has a resultant pressure of 3 atm.

Describe Boyle's Law.

Boyle's Law states that a gas's pressure is inversely proportionate to its volume at constant temperature:

P ∝ 1/V

The necessary equation for the posed question is:

P1V1 = P2V2, and

Initial pressure is P1 and is 1.5 atm.

Initial volume = 2 L for V1.

final pressure = P2 =?

Final volume = 1 L, or V2.

Using the aforementioned equation and all of these data, we obtain

P₂ = [tex]\frac{(1.5x2)}{1}[/tex]= 3atm

Therefore, 3 atm of pressure is needed.

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Gravity increases as the mass of either object increases.

Gravity is the force by which a planet or other body draws objects toward its centre. The force of gravity keeps all of the planets in orbit around the sun.

Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.

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