Someone help pleaseeee I will give brainliest

Answer:

1.94 moles

Explanation:

because moles =mass/mr

=34.9/18

which gives 1.938 so we round it up to 1.94

mr of H2O is 18

hope this helps :)

1.94 moles of water in 34.9 g of water.

It is defined as given mass over molar mass.

Molar mass = 18 g/mol

Number of moles  =  Given mass  /  Molar mass

Number of moles = 34.9 g / 18 g/mol

Number of  moles = 1.94 moles

Thus, 1.94 moles of water in 34.9 g of water.

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Answer:

Resistance

Explanation:

Resistance is the measure of the opposition of current in a circuit.

Answer:

Increasing the temperature

Explanation:

The rate of solubility depends on a few factors. By increasing the temperature, the kinetic energy of the particles increase, leading to a higher rate of diffusion, dissolving the solid solute quicker.

2 F atoms

Explanation:

A Ca atom has a valence number of +2, which means that when ionized, it will give up two electrons. In turn, a F atom has a valence number of -1, which means it can only accept 1 electron when ionized. So to accommodate the two electrons from Ca atom, we need 2 F atoms.

Answer:

[tex]0.64molCr(NO_3)_3[/tex]

Explanation:

Hello there!

In this case, according to the given chemical equation, it turns out possible for us to realize there is a 4:3 mole ratio of chromium(III) nitrate to lead(IV) nitrate, and therefore, we can calculate the moles of the former by applying the shown below stoichiometry setup:

[tex]0.85molPb(NO_3)_4*\frac{3molCr(NO_3)_3}{4molPb(NO_3)_4} \\\\0.64molCr(NO_3)_3[/tex]

Regards!

Answer:

1. 868.8832g

2. .0053385mol

3.34.87 mol

4. 7049.088 g

Explanation:

I used the molar mass equation M= gram/mol and plugged in the numbers for each equation to figure out the missing part.

Answer:

Since the alligator population decreased, this means there are less predators for the gar. Less predators for the gar mean the gar population will increase.  More gar also means more competition for the diving duck in terms of animals that eat crabs, and thus the diving duck population will also decrease.

Explanation:

Hope this helped <3

440 torr

Chemistry

Ideal Gas Law

Boyle's Law: P₁V₁ = P₂V₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Equality Properties

Step 1: Define

Identify

[Given] V₁ = 1.25 L

[Given] P₁ = 760 torr

[Given] V₂ = 2.15 L

[Solve] P₂

Step 2: Solve for P₂

Step 3: Check

Follow sig fig rules and round. We are given 2 sig figs as our lowest.

441.86 torr ≈ 440 torr

Answer:

friend me on here and imma send you the link Explanation:

Temperature is 258.32°C

Using the ideal gas equation;

PV = nRT        --------------(i)

Where;

P = Pressure of the gas

V = Volume of the gas

n = number of moles of the gas

R = Gas constant = 8.31 J/mol · K

T = Temperature

Given:

mass of H₂ gas = 7.056 grams

Volume of the gas = 85L = 8.5 x 10⁻³m³

Pressure of the gas = 101.3kPa = 101.3 x 10³Pa = 1.013 x 10⁵Pa

Steps:

(i) Using the mass of the gas, calculate the number of moles using the relation:

n = m / M         ----------------- (ii)

Where;

m = mass of H₂ = 7.056g

M = Molar mass of H₂ = 1g/mol

Substitute these values into equation (ii) as follows:

n = 7.056g / (1g/mol)

n = 7.056mol

(ii) Now calculate the temperature of the balloon by substituting the necessary values into equation (i)

(1.013 x 10⁵Pa)(8.5 x 10⁻³m³) = (7.056mol) (8.31 J/mol · K)(T)

T = (1.013 x 10⁵Pa)(8.5 x 10⁻³m³) ÷ (7.056mol) (8.31 J/mol · K)

Solving the above gives

T = 14.68K

Convert this to Celsius

T = 273 - 14.68

T = 258.32°C

Answer:

the digestive system

Explanation:

The digestive system is the stomache

it breaks down the food

makes glucine

creates energy

Stomach

Explanation:

When food enters your stomach, it mixes the foods and liquids with digestive juices.

Inside the balloon, the gas particles collide with the balloon's inner walls. ... As the molecules heat up, they move faster and strike the inside wall of the balloon harder. This increased motion of the gas particles increases the force on an area of the balloon, producing a rise in the pressure.

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Answer:

Answer:

Kc = 0.20        

Explanation:

                 N₂O₄     ⇄    2NO₂

moles       5.3mol          2.3mol

Vol               5L                5L

Molarity    5.3/5M        2.3/5M

               = 1.06M     = 0.46M

Kc = [NO₂]²/[N₂O₄] =  (0.46)²/(1.06) = 0.1996 ≅ 0.20

Note:

All credit goes to  drpelezo (Ace) who created and explained the answer.

Have a nice day, and I hope this helps

-kiniwih426

Answer:

Though a hydrogen atom has only one electron, it contains a large number of shells, so when this single electron jumps from one shell to another, a photon is emitted, and the energy difference of the shells causes different wavelengths to be released... hence, mono-electronic hydrogen has many spectral lines.

Explanation:

thank me later

The reason that the atomic emission spectrum of hydrogen contains only four lines is the hydrogen atoms form a continuous series of quantized energy levels that transmute at a variety of frequencies.

The emission spectrum of hydrogen consist of numerous spectral series, the wavelength is postulated by Rydberg formula.

The reason behind the lines of spectrum is the transition of electron between two energies.

Thus, the correct option is A.

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Answer:

Unsaturated

Explanation:

An unsaturated solution contains less solute than it can normally hold at a particular temperature.

This kind of solution can also dissolve more solute.

Hence, when a bit of solute is added to this solution, the solute dissolves indicating that the original solution was unsaturated.

Answer: The mass of barium nitrate required is 23.91 g

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]    ......(1)

Given mass of sodium phosphate = 10.0 g

Molar mass of sodium phosphate = 163.94 g/mol

Plugging values in equation 1:

[tex]\text{Moles of sodium phosphate}=\frac{10.0g}{163.94g/mol}=0.061 mol[/tex]

The chemical equation for the reaction of sodium phosphate and barium nitrate follows:

[tex]3Ba(NO_3)_2+2Na_3PO_4\rightarrow Ba_3(PO_4)_2+6NaNO_3[/tex]

By the stoichiometry of the reaction:

If 2 moles of sodium phosphate reacts with 3 moles of barium nitrate

So, 0.061 moles of sodium phosphate will react with = [tex]\frac{3}{2}\times 0.061=0.0915mol[/tex] of barium nitrate

Molar mass of barium nitrate = 261.337 g/mol

Plugging values in equation 1:

[tex]\text{Mass of barium nitrate}=(0.0915mol\times 261.337g/mol)=23.91g[/tex]

Hence, the mass of barium nitrate required is 23.91 g

Answer:

El sistema cardiovascular tiene como función distribuir los nutrientes y el oxígeno a las células del cuerpo y recoger los desechos metabólicos para después eliminarlos en los riñones a través de la orina, y por el aire exhalado en los pulmones. El sistema cardiovascular comprende el corazón, que actúa como una bomba que mantiene el conjunto en funcionamiento, los vasos sanguíneos (arterias, venas y capilares), que son los conductos que transportan la sangre y, la sangre, que es el líquido fluido que contiene las células producidas por la maduración de las células madre de la médula

Answer:

The correct hypothesis would be - "if a water body contains a high amount of heavy metals such as chromium and lead then the death of the fishes will increase because lead and chromium affect the aquatic environment and gills of fishes."

Explanation:

Heavy metal like chromium in a high concentration can affect the gills of the fishes, it is seen in fishes that swim at the point of disposal of metals at thewater surface harm their gills. In high concentration, it becomes toxic for the fishes.

Lead also causes a negative impact on the aquatic ecosystem if accumulated in a high amount in the aquatic environment that leads to the death of the fishes.

Answer:

There are 122.1982401 moles of  H2O in [tex]7.36*10^{25}[/tex]  molecules of H2O

Explanation:

We know,

[tex]6.023*10^{23}[/tex]  molecules of H2O contains 1 mole H2O

            1      molecules of H2O contains [tex]\frac{1}{6.023*10^{23}}[/tex]  mole H2O

∴ [tex]7.36*10^{25}[/tex] molecules of H2O contains [tex]\frac{1}{6.023*10^{23}}*(7.36*10^{25})[/tex] moles of H2O

                                                               = 122.1982401 moles of  H2O

∴ There are 122.1982401 moles of  H2O in [tex]7.36*10^{25}[/tex]  molecules of H2O

Answer:

Alpha

Alpha decay

When a nucleus emits an alpha particle, these changes happen: the mass number decreases by 4.

Answer:

11.0 L

Explanation:

Podemos resolver este problema usando la ley de Charles, que afirma que a presión constante:

Donde el subíndice 1 indica las condiciones iniciales y el 2 las finales. En este caso:

Introducimos los datos:

Y calculamos V₂:

Answer:

The answer is pentene.

Explanation:

The nomenclature for an organic compound with 5 carbon atoms will have a  -pent prefix.

An organic compound with at least one double bond will have alkene suffix, which is -ene.

Thus, the nomenclature for an organic compound that has 5 carbon atoms with at least one double bond will be pentene.  

Answer:

Part A:

"360 grams of NaCl can be dissolved in 1 L water. So, 2000 grams sugar can be dissolved in 1 L water then we can say that the solubility of salt is lesser in water as to sugar and both heightened by increasing the temperature. If we make a batch of 800 L we can add sugar, 1600 kg at 25 0c. We can add salt is 288 kg at 25 0c and the ingredient tomato is having low solubility."

Read more at Answer.Ya.Guru – https://answer.ya.guru/questions/8061-describe-the-sequence-of-adding-ingredients-to-make-the-recipe.html

Part B:

'Manufacturers can generate new value minimize cost and increase operational stability by focusing on 4 broad areas; Management, Supply Circle, Product Design, and Value Recovery.'

Read more at Answer.Ya.Guru – https://answer.ya.guru/questions/2807911-what-changes-could-be-made-to-optimize-the-manufacturing-process.html

In order to make tomato soup, the salt NaCl is first added, then followed by sugar and finally the tomato powder.

Tomato soup is made of the following ingredients:

In order to make tomato soup, the salt NaCl is first added, then followed by sugar. This is to ensure increase in the boiling point of water and to reduce the heating time of the tomato soup.

The solution is heated to induce more dissolution if solute and finally the tomato powder is added.

In order to optimize the manufacturing process, changes should be made in the design, supply and composition of the soup.

Therefore, an optimized manufacturing process will reduce cost of production.

Learn more about tomato soup at: https://brainly.com/question/21475711

Answer:

hi! I hope your having a awesome day

Explanation:

Answer:

The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want.

change 25 grams of potassium chlorate to moles.

calculate the gram molecular mass of potassium chlorate.

Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.

1 K x 39 grams/mole

+1 Cl x 35.4 grams/ mole

+3 O x 16 grams/ mole

= 122.4 grams / mole Potassium Chlorate

25

122.4

= moles.

2.05 moles of Potassium Chlorate.

There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.

2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride.

Find the gram molecular mass of Potassium Chloride.

1 K x 39 = 39

+1 Cl x 35.4 = 35.4

= 74.4 grams / mole.

2.05 moles x 74.4 grams/ mole = 15.2 grams

Explanation:

hope this helped :)

Answer:

1574joules of heat

Explanation:

Q= mc( T2-T1)

=150 * 0.477 *22

=1574 joules

1574.1 Joules heat is needed to raise the temperature of 150 g of manganese by 22°C.

The quantity or amount of heat per unit mass required to raise the temperature of a body by one degree Celsius is known as specific heat. The unit of specific heat are joules or calories per gram per degree Celsius. Specific heat is an intensive property.

Calculate heat to raise temperature

Relationship between temperature and heat is expressed as:

Q = mcΔT

where,

Q is heat energy in Joules (J)

m is mass (in grams)

c is specific heat in J/g°C

ΔT is change in temperature

Now, put the values in above formula, we get that

Q = 150 × 0.477 × 22

Q = 150 × 10.494

Q = 1574.1 Joules

Thus, we can say that 1574.1 Joules is needed to raise the temperature  of 150g of manganese by 22°C.

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Answer:

The answer is " salt".

Explanation:

Hey there!

When any acids and base react with eachother, they forms water and respective salts.

For example:

HCl + NAOH = NACl + H2O.

Hope it helps!

Answer:

2.18 grams of Br2 reacts to produce 3.25 grams of KBr

Explanation:

The balanced equation is

2 KI + Br2 → 2 KBr + I2

2 moles of KI and 1 mole of Br2 reacts to produce two molecules of KBr

Mass of two moles of KI = 2 * 166 grams

Mass of one mole of Br2 = 159.808 grams

Mass of two moles of KBr = 2* 119 grams

Thus,  159.808 grams of Br2 reacts to produce 2* 119 grams of KBr

2.18 grams of Br2 reacts to produce {(2* 119)/ 159.808} * 2.18 grams of KBr

2.18 grams of Br2 reacts to produce 3.25 grams of KBr