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2.55 × 10²⁴ molecules H₂O

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[Given] 76.4 g H₂O

[Solve] molecules H₂O

Step 2: Identify Conversions

Avogadro's Number

[PT] Molar Mass of H - 1.01 g/mol

[PT] Molar Mass of O - 16.00 g/mol

Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol

Step 3: Convert

Step 4: Check

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

2.55317 × 10²⁴ molecules H₂O ≈ 2.55 × 10²⁴ molecules H₂O

Answer:

Option B. 101.60 KPa

Explanation:

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

Total pressure (Pₜ) = 105.00 KPa

Partial pressure of wet gas (Pᵥᵥ) at 26 °C = 3.4 KPa

Partial pressure of dry gas (Pₔ) =?

Total pressure = partial pressure of dry gas + partial pressure of wet gas

Pₜ = Pₔ + Pᵥᵥ

105 = Pₔ + 3.4

Collect like terms

105 – 3.4 = Pₔ

Pₔ = 101.60 KPa

Therefore, the partial pressure of the dry gas is 101.60 KPa

Answer:

a

Explanation:

as the law of conservation of matter (mass) states: matter can not be created nor destroyed but can transform from a form to another.

since the conversion of mass to energy can not be done except in nuclear reactions via (E= mc2). normal chemical equations must be balanced to achieve the law.

Answer:

21

Explanation:

P=2(l+w)=2·(8+2.5)=21

Hope this helps :)

Answer:

What I've done:

Molar mass of Zn: 65.409 g/mol

Molar mass of Cl: 2*35.453 =70.906 g/mol

Molar mass of O: 6*15.9994 =95.9964 g/mol

Total molar mass of Zn(ClO3)2: 232.3114 g/mol

21% of molar mass = 232.3114 g/mol

100% of mass = 1106.244762 g/mol

Molar mass of H2O: 18.01528 g/mol

232.3114 g/mol + 18.01528 g/mol = 250.32668 g/mol

250.32668 = 1106.244762

1106.244762 g/mol divided by 232.3114 g/mol

x = 4.419

Explanation:

% anything = (g/total mass)*100 = ?

Atomic mass Zn = 65.4 from your post.

molar mass Zn(ClO3)2 from your post = 232.3

molar mass H2O = 18

The 21.5% Zn is (note you used 21%) percent Zn in the hydrate so

%Zn = [(65.4)/(232.3 + x*18)]*100 = 21.5%

Solve for x and I obtained 3.99 which rounds to 4.00. Let me know if you don't understand any part.

Answer:

According to an energy pyramid model, Producer is expected have the largest biomass in land ecosystems

Explanation:

In a trophic level, the producers possess the largest biomass. With the increasing trophic level, the biomass reduces. Hence, the producers at the base have high biomass.

On terrestrial ecosystem, the producers are the plants and trees and hence the greatest biomass exists in the plants and trees.

Hence, in an energy pyramid model, Producer is expected have the largest biomass in land ecosystems  

Answer:

Hunting

Explanation:

Things like hunting is instinct to animals and it's it beneficial to the survival of a young predator so it doesn't starve and die

Answer:HuntingExplanation:Things like hunting is instinct to animals and it's it beneficial to the survival of a young predator so it doesn't starve and die

Explanation:

Answer:

Its B

Explanation:

I just took the quiz.

When [tex]CH_{3} Br[/tex] and OH collide in order to react and form [tex]CH_{3} OH[/tex] , such reaction will be best represented by diagram (B).

A chemical reaction would be a procedure that causes one group of chemical components to change chemically into another. In a chemical reaction, one or even more substances also known as reactants would be changed into one or more additional materials known as products. Chemical elements and chemical compounds make up substances.

A colloid would be a mixture wherein the component made up of insoluble particles that are scattered at a microscopic scale is suspended within another component.

When

[tex]CH_{3} Br + OH[/tex] → [tex]CH_{3} OH + Br[/tex].

By the Collison of  methyl bromide with OH ion then methyl alcohol will be formed.

Therefore, when [tex]CH_{3} Br[/tex] and OH collide in order to react and form [tex]CH_{3} OH[/tex] , such reaction will be best represented by diagram (B).

Therefore, the correct answer will be option (B).

To know more about Collison

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Answer:

ur answer would be D.)

Explanation:

Hope this helps

also happy birthday

Answer:

Subside

Explanation:

Answer:

lower, reduce, decline

Explanation:

Answer:

0.029 g/mL or 0.5 M

Explanation:

The concentration in g/mL is:

As for calculating the molar concentration, first we convert 14.61 g of NaCl to moles, using its molar mass:

Then we divide the number of moles by the volume in liters:

Answer:

I only know the answer to the second one, The bond that occurs between two metal atoms is a metallic bond

Answer:

A. Industrial waste

Explanation:

Answer:

Water softening is the process of removing the dissolved calcium and magnesium salts that cause hardness in water

Explanation:

Answer:

Follows are the solution to the given points:

Explanation:

In point a:

Just the y-axis graph intensity as well as the "y" absorption. Find a path or intercept utilizing Excel or simple math.

In point b:

There are two different ways:

Graphically = Then add the unknown absorbance.

Its intensity of the unknown, if they consider the y axis to pull the straight line to the line marked but instead drop it off on the x-axis.

= resolve, [tex]y=mx+b[/tex]  from of the line even for the x variable and also get on 

[tex]\to \frac{(y-b)}{m}= x[/tex]

Plug [tex]y \ value = (0.402)[/tex] and the un-concentration is also in place

Answer:

19. C 20. A 21. H 22. G 23. D 24. F 25. B 26. E

Explanation:

Just learnt it in science class

Answer: The volume of sample at 400 K is [tex]285cm^3[/tex]

Explanation:

Charles' Law: This law states that volume is directly proportional to the temperature of the gas at constant pressure and number of moles.

[tex]V\propto T[/tex]     (At constant pressure and number of moles)

[tex]{\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

where,

[tex]V_1[/tex] = initial volume of gas  = [tex]257cm^3[/tex]

[tex]V_2[/tex] = final volume of gas  = ?

[tex]T_1[/tex] = initial temperature of gas  = 360 K

[tex]T_2[/tex] = final temperature of gas  = 400 K

Putting in the values we get:

[tex]{\frac{257}{360}=\frac{V_2}{400}[/tex]

[tex]V_2=285cm^3[/tex]

Thus volume of sample at 400 K is [tex]285cm^3[/tex]

Answer:

D

Explanation: 400 cm

The mass and velocity of an object determines its kinetic energy. The kinetic energy of the substance with mass of 10 kg and speed of 5 m/s is 125 J. Hence, option b is correct.

Kinetic energy of an object is generated by virtue of its motion. The kinetic energy is dependent to the mass and speed of the object by the expression written below;

Ke  = 1/2 mv²

Therefore, as the mass or speed or both increases kinetic energy increases. When an object starts moving its potential energy gets converted to kinetic energy.

Given that mass = 10 Kg

speed = 5 m/s

then Ke  = 1/2 10 kg × 5 m/s   × 5 m/s =  125 J

Therefore, the kinetic energy of the object is 125 J, option c is correct.

Find more on  kinetic energy:

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Answer:

Hey mate.....

Explanation:

This is ur answer....

Plastics are produced from natural gas, feedstocks derived from natural gas processing, and feedstocks derived from crude oil refining.

Hope it helps,

Mark me brainliest....

:D

Answer:

Oil and natural gas are chemically broken down into small compounds that combine to form plastic.

Answer:

Answer:

it gives up electrons B. because the bond between the electrons is not very strong due to how few of them there are

Explanation:

Answer:

Scientists have observed that electromagnetic radiation has a dual "personality." Besides acting like waves, it acts like a stream of particles (called "photons") that have no mass. The photons with the highest energy correspond to the shortest wavelengths.

Explanation:

Hope It Help

Explanation:  C) the air temp. at the top is lower

Answer:

[a]. 108 mL.

[b].

1. use HCL in washing for the neutralization of NaOH.

2. Wash with water.

3. make use of MgSO4 to remove water traces.

4. Evaporate to get the pure cyclohexane

Explanation:

The chemical equation for the reaction between 2-naphthol and Sodium hydroxide is given below as:

C₁₀H₈O + NaOH --------------------------------------------------> C10H7O⁻ Na⁺ + H₂O.

The C10H7O⁻ Na⁺ is  the aqueous phase.

The molarity of Sodium Hydroxide is = [ (mass of sodium hydroxide ) ÷ molar mass sodium  hydroxide × volume] × 1000.

The molarity of sodium hydroxide = [ (5/40) × 100] × 1000 =  1.25 M.

The number of moles of 2-naphthol = mass / molar mass =  20 / 144.17 = 0.138 moles.

Recall that, the formula for the number of moles = concentration × volume. Therefore, the volume of sodium hydroxide is given below as:

Volume of sodium hydroxide = the number of moles of sodium hydroxide ÷  concentration of sodium hydroxide = 0.138 ÷  1.25 = 0.108L = 108 mL.

In order to efficiently isolate relatively pure cyclohexane from the ether layer, the following process must be followed:

1. use HCL in washing for the neutralization of NaOH.

2. Wash with water.

3. make use of MgSO4 to remove water traces.

4. Evaporate to get the pure cyclohexane

Answer:

We know that polar molecules are attracted to each other by dipole-dipole attractions between the partial negative charge of one polar molecule and the partial positive charge on another polar molecule. Therefore, polar molecules like HCl are held together by both dipole-dipole attractions and London forces.