What's the molality of a solution with 120 g of NaCl and 30 kg of water?A)0.068B)0.004C)0.25D)6.8

Answer:

6.13, 7.53, 8.13, 10.25, 12.24

Explanation:

Without any KOH, the pH can be calculated using an ICE table (initial, change, equilibrium). I will assume that the pka is 7.53 since that's the value that wikipedia gives
after setting up the table the equation left should be:
[tex]\frac{x^2}{0.19-x} = 2.95*10^{-8}[/tex] - original equation
the equation can be simplified to [tex]\frac{x^2}{0.19} = 2.95*10^{-8}[/tex] since if x is really small, (0.19-x) will be pretty much equal to 0.19
solve to get x = 7.49*10^-7, and since [tex]\frac{7.49*10^{-7}}{0.19}[/tex] is very small, we don't have to calculate x with the original equation instead of approximating it with the simplified equation
since x = [H3O+], -log(x) would give us the ph, so the pH would be

-log(7.49*10^-7) = pH = 6.13

For the other problems, calculate the number of moles of each of the components
in total, we have 0.05*0.19 moles of HClO, which is 0.0095 moles.
after adding 0.025*0.19 moles of KOH (0.00475 moles), there would be 0.0095-0.00475 moles of HClO left, and 0.00475 moles of ClO- would be generated. The concentrations of both ClO- and HClO are both about equal to 0.00475/0.075 (0.075 is the total amount of liquid after adding 25 ml of KOH). The fraction simplified to 0.0633
Using the equation
pH = pKa + log([A-]/[HA]), we would get pH = 7.53 + log(0.0633/0.0633)
so pH = 7.53 after 25 mls of KOH has been added

Do a similar thing for 40 mls of KOH being added.

pH = 7.53 + log(0.0844/0.0211) = pH = 8.13

For 50 mls, an ICE table needs to be used again since the moles of base and acid are roughly equal.

The resulting solution should be equal to adding
0.05*0.19 moles of KClO to water, which would be a 0.05*0.19/0.1 molar concentration, or 0.095M
Set up an equation and use ICE:
[tex]ClO^-+H2O = > HClO + OH^-[/tex]
the Kf of this equation can be calculated by rearranging this reaction and utilizing the equation for the auto-ionization of water
[tex]HClO + H2O = > H3O^+ + ClO^-[/tex] with a Ka of 2.95*10^-8

flip the reaction to get:
[tex]H3O^+ + ClO^- = > HClO + H2O[/tex] and the Ka is 1/(2.95*10^-8) , or 33898305.1

Use the equation:
[tex]2H_2O = > H_3O^+ + OH^- , \ \ \ \ K_w = 10^{-14}[/tex]
and add the equations

[tex]2H2O + H3O^+ + ClO^- = > HClO + H2O + H3O^+ + OH^-[/tex]

the K for this equation is just 33898305.1 times 10^-14
which is 3.39*10^-7
the equation can have terms present on both sides of the equation canceled out to get
[tex]ClO^-+H2O = > HClO + OH^-[/tex] with a K of 3.39*10^-7

Set up the ICE table once more, note that the ClO- concentration is 0.095

x^2/(0.095-x) = 3.39*10^-7
approximate the equation to be:
x^2/(0.095) = 3.39*10^-7
solve for x = 0.00017945 = [OH-]
the pOH would be 3.746, and since 14 = pH+pOH,
14 = pH + 3.746
pH = 10.25

For the final equation it is much simpler. Since the moles of strong base is more than the moles of acid, the pOH can be calculated by just taking the -log of the excess base, which is 0.01*0.19 moles, or 0.01*0.19/(0.11) molar solution
The concentration of OH is 0.01*0.19/(0.11), which is 0.0173.
-log(0.0173) = pOH
pOH = 1.76
pH = 1.76 = pH = 12.24

According to the given statement 4.64 grams of O₂(g) are needed to completely burn 27.6 g C₃H₂(g).

Chemical equations are symbolic depictions of chemical reactions where the reactants and products are stated in terms of their respective chemical formulae.

Mass of C₃H₂ = 27.6 g

Molar mass of C₃H₂  = 38.05 g/mol

Molar mass of O₂= 32 g/mol

We have to calculate the moles of C₃H₂

moles of C₃H₂ = given mass C₃H₂/molar mass C₃H₂

moles of C₃H₂ = 27.6/38.05 = 0.725 mol

We have to calculate the moles of C₃H₂

The balanced chemical equation is:

C₂Hg (g) + 5O₂(g) → 3 CO₂(g) + 4H₂O(g)

From the reaction, we conclude that

As, 1 mole of C₂Hg react with 5 mole of O₂

So, 0.725 mole C₃H₂ of  react with 0.725/5 = 0.145 mole of O₂

We have to calculate the mass of O₂

Mass of O₂ = Moles of O₂ * Molar mass of O₂

Mass of O₂ = (0.145moles) * (32g/mol) = 4.64g

The mass of O₂ needed is, 4.64 grams.

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a) 2Al (s) + 6HCl (aq) → 2AlCl3 (aq) + 3H₂ (g)

b) 2C10H8 (s) + O2 (g) → H₂0 (1) + CO2 (g)

c) 2 Na2SO4 + 2 BA(NO3)2 → 2 BA(SO4) + 2NANO3

d) CaCO3 + heat → CaO + CO2

This are the Balanced Chemical equations.

The chemical equation can be said to as a balanced one if there are no inequalities. Every element in this illustration of a balanced equation has the same number of atoms on the reactant and product sides.

Chemical equation that is balanced is described as one in which the number of atoms of various elements on the reactants side (left side) and that on the product side (right side) are equal.

The reactants and products are now placed on the left and right sides of the arrow, respectively so that they create a balanced equation. Coefficients, that appear as a number before any kind of chemical formula, represent moles of a compound.

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The term route of entry on an SDS refers to the way a chemicals enters the body

The Safety data sheet (SDS) means which refer to the very complete documents about the chemicals the written or printed material concerning a hazardous chemical that is prepared in accordance with the HCS and the means by which a material may gain access to the body and example is inhalation, ingestion, and skin contact and and routes  on an SDS refers to the way enters the chemicals in the body

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H3PO3 - is the formula for phosphorous acid

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Answer: the answer is D

Explanation: hope this helps just did it

Air flowing over an airplane's wing can be thought of as a river flowing around a rock Conceptual. Option A.

Air moves around the wing at about 100 knots. Slightly faster based on the profile. However, if you measure the airspeed within 1 inch of the wing surface, you'll find that the airflow slows down. When it reaches the surface of the wing, the velocity of the airflow is zero. Bernoulli's Principle helps explain how the shape of a wing gives an airplane lift.

They are shaped so that the airflow is faster at the top of the wing and slower at the bottom. Fast-moving air corresponds to low pressure, and slow-moving air corresponds to high pressure. The wing is shaped and raked so that the air moving over it moves faster than the air moving underneath. As the airspeed increases, its pressure decreases. So fast-moving air at the top exerts less pressure on the wing than slower-moving air at the bottom. The result is a wing thrust upward lift.

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The term mole concept is used here to determine the molar mass of an element. The molar mass of the element is 80.62 g/ mol.

One mole of a substance is that quantity of it which contains as many particles or entities as there are atoms in exactly 12 g of carbon -12. The equation which is used to calculate the number of moles is:

The mass of one mole of molecules of a substance is defined as the molar mass. It is generally expressed in g mol⁻¹

Number of moles = Given mass / Molar mass

Here the given mass of the element is 10.4 g. The number of moles of the element is 0.129 mole. Then the molar mass is:

Molar mass = Given mass / Number of moles

= 10.4 g / 0.129 mol

= 80.62 g/ mol

Thus the molar mass of element is 80.62 g/ mol.

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A reaction that starts with 10 g platinum, 180 mL 5 M HCl, and 223 mL 6.55 m [tex]HNO_3[/tex] will produce 20.9 grams of [tex]H_2PtCl_6[/tex].

First, let's look at the equation of the reaction:

[tex]3 Pt + 4 HNO_3 + 18 HCl -- > 3 H_2[PtCl_6] + 4 NO + 8 H_2O[/tex]

The mole ratio of Pt, [tex]HNO_3[/tex], and HCl from the balanced equation of the reaction is 3:4:18.

Mole of 10 g platinum = 10/195

                                     = 0.051

Mole of 180 mL, 5 M HCl = 180/1000 x 5

                                    = 0.9 moles

Mole of 223 mL, 6.55 M [tex]HNO_3[/tex] = 223/1000 x 6.55

                                        = 1.46 moles

Considering the mole ratio, HCl seems to be in excess while both platinum and [tex]HNO_3[/tex] are limiting.

Mole ratio of platinum and [tex]H_2PtCl_6[/tex] = 1:1

Equivalent mole of [tex]H_2PtCl_6[/tex] that is produced = 0.051 moles.

Mass of 0.051 mole platinum = 0.051 x 409.81

                                             = 20.9 grams

Thus, the amount of [tex]H_2PtCl_6[/tex] that would be formed is 20.9 grams.

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The compound with the highest boiling point is hexanone. Hexanone has the highest boiling point among the following substances at degree Celsius, and its structure is much more compact than that of the other substances.

The temperature at which a liquid's vapor pressure matches that of the surrounding environment's liquid is known as the boiling point. As gas forms below the surface and escapes upwards at this temperature, the liquid starts to bubble.

Important information about an organic compound's structural make-up and physical characteristics can be learned from its boiling point. The boiling point of a chemical can be used to identify and describe the substance. At higher atmospheric pressures, water boils more quickly than it does at lower atmospheric pressures.

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Based on the mass composition of the penny:

The density of the penny  that was made of a brass alloy that is 95% copper and 5% zinc by mass is calculated as follows:

The densities of copper and zinc are 8.96 g/cm³ and 7.14 g/cm³, respectively.

Density of Penny = 95% * 8.96 + 5% * 7.14

Density of penny = 8.87 g/cm³

The volume of the penny will then be;

volume of penny = 3.09 / 8..87

volume of the penny = 0.35 cm³

The thickness of the penny will then be;

radius of the penny = 0.95 cm

thickness of the penny = v /  π r²

thickness of the penny = 0.35 / 3.142 * 0.95²

thickness of the penny = 0.12 cm

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According to the given statement Summer are usually hot and dry represent climate.

Climate is the usual weather observed over a longer period of time in a certain location. A description of a climate includes specifics like the average temperature in each season, how much rain falls, and how much sun there is. Additionally, descriptions of the extreme are common.

Nearly every area of our life is impacted by the climate, including our food supplies, transport networks, clothing choices, and vacation destinations. It significantly affects our future, our wellbeing, and our means of subsistence. The long-term pattern of the climate in any given location is called the climate.

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The moles of SO₂ formed if you have 467.2 g of ZnS and excess O₂ is 4.79 moles.

The balanced chemical reaction of the give equation is-

2 ZnS(s) + 3 O₂(g) → 2 ZnO(s) + 2 SO₂(g)

What is mole?

Mole is defined as fundamental measurement unit which is used to measure the amount of substance.

Number of moles of ZnS = Given mass

                                             Molar mass

Moles of ZnS = 467.2 g

                          97.47 g/mol

Moles of ZnS = 4.79 moles

From the reaction, we know that

2 moles of ZnS forms 2 moles of SO₂

4.79 moles of ZnS forms 2 x 4.7 moles of SO₂

                                         2

Moles of SO₂ = 4.79 mol

Hence, the moles of SO₂ can be formed is 4.79 moles.

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Answer

Moles = 1.22 moles

Explanation

Given

Mass of water = 22 g

We know the molar mass of water = 18,01528 g/mol

Required: Moles of H2O

Solution

To calculate the number of moles, use

n = m/M where n is the moles, m is the mass and M is the molar mass

n = 22g/18,01528 g/mol

n = 1.22 mol

Answer:mole =22gm/ 18gm = 1.22moles

Explanation:A mole is calculated by dividing the given weight from molecular weight of the compound. In this case Molecular weight of H2O = 18 grams. So answer is 22/18= 1.22

The correct answer is to freeze. Option C.

This diffusion effect of water molecules during freezing means that applying pressure to water also lowers its freezing point. With enough pressure which makes it difficult for water molecules to spread out into the solid structure, liquid water is a few degrees below zero degrees Celsius.

When water is placed in a vacuum it freezes slower or faster than water placed in a container or freezer at normal atmospheric pressure. Atmospheric pressure does affect the freezing temperature. The higher the pressure the lower the freezing temperature. For water stored in a tank, its bottom pressure is the weight acting on a unit area of ​​the surface on which the tank is stored.

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The formula for the base dissociation constant (Kb) is Kb = [NH4+][OH-]/[NH3].

Kb is a temperature-dependent constant that is typically calculated at 25 degrees Celsius. Ammonia has a Kb value of 1.8E-5 (the notation "E-5" stands for "ten in power -5").

A basic solution is created when ammonia and water are combined. Ammonium hydroxide is created when a little amount of dissolved ammonia combines with water. This compound then breaks down into ammonium and hydroxide ions.

A material that absorbs hydrogen ions or protons in solution is referred to as a base. The base dissociation constant is the equilibrium constant for the equilibrium created when a weak base interacts with water.

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The cigarette smoke as it were is 686 times greater than the standard.

The term concertation is used to describe the amount of substance that is contained in a sample. There are several units that could be used in the measurement of concentration such as;

In this case, the designation 35.0 ppm means 35 units of carbon monoxide in  1,000,000 units, this is the same as saying 3.5 x 10^-5.

Again we have the percent concentration of the sample as 2.40% or 0.024. Hence we would get the number of  times greater than this standard is the CO concentration in cigarette smoke is by;

0.024/ 3.5 x 10^-5

= 686

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Answer:

In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.

Answer:

Cats are eazy to take care for and relatively affordable

Answer:

cats r better cuz there cats ovi

Explanation:

there small, easy to take care of, and the are good with kids depending on the breed.

Answer:

What does chemistry mean in science?

Chemistry is a branch of natural science that deals principally with the properties of substances, the changes they undergo, and the natural laws that describe these changes.

Explanation:

Answer:

Guys’ search it up on math thank me later

Explanation:

dhsjdjsusysgtjghtd fjfhfhcchdh

C2H4 + 3O2 ---> 2CO2 + 2H2O

From the calculation, we now obtain the molarity of the sulfuric acid to be 5.8 Mol/L

The term concentration is defined as the ratio of the number of moles to the volume of the solution. We know that unit of the molarity of the solution is the moles per liters.

We know the following;

Mass of the acid =  571.6 g

Volume of the acid = 1.000 x 10^3 ml or 1 L

Molar mass of the acid = 98.08 g/mol

Hence;

Number of moles of the acid = 571.6 g/98.08 g/mol = 5.8 moles

Molar concentration of acid = 5.8 moles/ 1 L

= 5.8 Mol/L

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The molarity of a CaCl₂ solution that is prepared by dissolving 27.1 g of CaCl₂ in sufficient water to give 779 mL of solution is 0.31M.

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

The molarity of a substance can be calculated by dividing the number of moles of the substance by the volume.

According to this question, 27.1 g of CaCl₂ is dissolved in sufficient water. The number of moles can be calculated as follows:

moles = 27.1g ÷ 110.98 g/mol

moles = 0.24mol

Molarity of CaCl₂ = 0.24mol ÷ 0.779L

Molarity of CaCl₂ = 0.31M

Therefore, 0.31M is the concentration required to prepare by dissolving 27.1 g of CaCl₂ in sufficient water.

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Answer: 74.54kg

Explanation:

Gasoline is 0.79 g/mL

1Kg/1000g x 0.79g/mL x 1000mL/1L x 1L/1.06 quarts x 4 quarts/1gallon x 25 gallons

1 x 0.79 x 1000 x 1 x 4 x 25  divided by 1000 x 1 x 1 x1.06 x 1 =74.54Kg

Newton's laws of motion the answers to these is an object will not change its motion unless a force acts on it

In the first law an object will not change its motion unless a force acts on it and in the second law, the force on an object is equal to its mass times its acceleration and in the third law when two objects interact they apply forces to each other of equal magnitude and opposite direction and newton's second law is a quantitative description of the changes that a force can produce on the motion of a body and it states that the time rate of change of the momentum of a body is equal in both magnitude and direction to the force imposed on it

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CO 2

H ₂0

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Answer:

that is some above

Explanation:

because of the chemical reaction