What is molarity of 47.0 g KCl dissolved in enough water to give 375 mL of solution?

A solution has a pH of 5.4, the determination of [H+].

Take negative to other side

-pH = log H+

multiple Antilog on both side

(Antilog and log cancel each other )

Antilog (-pH) = [ H+ ]

New Formula :- Antilog (-pH) = [+H]

Now put the values of pH in new formula

Antilog (-5.4) = [+H]

we can write -5.4 as (-6+0.6) just to solve Antilog

Antilog ( -6+0.6 ) = [+H]

Antilog (-6) × Antilog (0.6) = [+H]

[tex]Antilog (-6) = {10}^{ - 6} , \\ Antilog (0.6) = 4 [/tex]

put the value in equation

[tex] {10}^{ - 6} \times 4 = [H+] \\ 4 \times {10}^{ - 6} = [H+][/tex]

Given the data from the question, the mass of arsenic that contains 1.23×10²⁰ atoms is 0.0153 g

6.02×10²³ atoms = 1 mole of arsenic

But

1 mole of arsenic = 75 g

Thus, we can say that:

6.02×10²³ atoms = 75 g of arsenic

6.02×10²³ atoms = 75 g of arsenic

Therefore,

1.23×10²⁰ atoms = (1.23×10²⁰ × 75) / 6.02×10²³ atoms)

1.23×10²⁰ atoms = 0.0153 g of arsenic

Thus, 1.23×10²⁰ atoms is present in 0.0153 g of arsenic

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The proportion of long-tailed squirrels may have increased due to increased food availability.

The statement has it that the percentage of long tailed increased also that the long tailed are better at jumping and balancing on trees.

The first option could is tempting but saying decrease in trees would not likely support the argument.

The last option has more sound options as more food availability may lead to population increment

Hope it helps....

Answer:

Explanation:

2Al(s) + 3 2 O2(g) → Al2O3(s) And given the stoichiometry ...and EXCESS dioxygen gas...we would get 6.25⋅ mol of alumina. the which represents a mass... ...6.25 ⋅ mol ×101.96 ⋅ g ⋅ mol−1 molar mass of alumina ≡ 637.25 ⋅ g.

Answer:

56.7 grams of aluminum oxide (AI²O³) are produced.Need a fast expert's response.

Answer:In general, the gross composition of cow's milk in the U.S. is 87.7% water, 4.9% lactose (carbohydrate), 3.4% fat, 3.3% protein, and 0.7% minerals (referred to as ash).

Explanation:

i got it ccorerct

Answer:

The milk of goats and sheep is similar in composition to that of cows.

Milk protein consists mainly of casein, and it exists in several classes: α, β, etc. If milk pH falls below 4.6, the casein precipitates. Although casein represents 80–85% of total milk protein, when precipitation occurs, the liquid portion is referred to as whey.

The remaining proteins are found in whey, and they include serum albumin, immunoglobulins, α-lactalbumin, etc. Milk carbohydrate is lactose, and its content is fairly consistent among breeds of milk cows at around 5.0%.

lactose is the main sugar; smaller quantities of glucose and citric acid exist. The fat content varies between ca. 3.5 and 5.0% depending upon cattle breed.

The ash content of around 0.7% consists of a relatively high level of Ca2+ and a lower level of Fe2+.

The pH of fresh whole milk is around 6.6 but it may reach ca. 6.8 from a cow that has mastitis.

Mastitis is an infection of the udder that is most often caused by Streptococcus agalactiae and S. Uberois but sometimes by Staphylococcus aureus or Streptococcus dysgalactiae.

Fresh milk of mastitis cows mainly has leucocytes (white blood cells) >106/ml as compared to nonmetastatic milk which has 70,000/ml leucocytes.

Milk contains a very adequate supply of B vitamins with pantothenic acid and riboflavin being the two most abundant. Vitamins A and D are added for human consumption, and their presence has no known effect on the activity of microorganisms.

Overall, the chemical composition of whole cow’s milk makes it an ideal growth medium for heterotrophic microorganisms, including the nutritionally fastidious Gram-positive lactic acid bacteria. However, the milk microbiota utilizes these constituents and brings about its spoilage.

The aqueous solution and their respective properties include the following:

This is defined as the degree of acidity or alkalinity of a substance and pH from 1.0 - 6.9 is acidic, 7 is neutral while 7.1 - 14.0 is basic.

The aqueous solutions and their appropriate pH can be seen above which is the right choice.

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Answer:

             287.30 g of FeCO₃

Solution:

The Balance Chemical Equation is as follow,

                           FeCl₂ + Na₂CO₃    →    FeCO₃ + 2 NaCl

Step 1: Calculate Mass of FeCl₂ as,

                            Molarity  =  Moles ÷ Volume

Solving for Moles,

                            Moles  =  Molarity × Volume

Putting Values,

                            Moles  =  2 mol.L⁻¹ × 1.24 L

                           Moles  =  2.48 mol

Also,

                            Moles  =  Mass ÷ M.Mass

Solving for Mass,

                            Mass  =  Moles × M.Mass

Putting Values,

                            Mass  =  2.48 mol × 126.75 g.mol⁻¹

                            Mass =  314.34 g of FeCl₂

Step 2: Calculate Mass of FeCO₃ formed as,

According to equation,

          126.75 g (1 mole) FeCl₂ produces  =  115.85 g (1 mole) FeCO₃

So,

               314.34 g of FeCl₂ will produce  =  X g of FeCO₃

Solving for X,

                     X =  (314.34 g × 115.85 g) ÷ 126.75 g

                     X =  287.30 g of FeCO₃

Answer:

Warmth (in addition to sunlight) at the Earth's surface.

Explanation:

Heat radiated from Earth's surface is absorbed by water vapor molecules in the lower atmosphere. The water vapor molecules, in turn, radiate heat in all directions. Some of the heat returns to the Earth's surface. Thus, water vapor is a second source of warmth (in addition to sunlight) at the Earth's surface.

Answer:

The solidifying/cooling and crystallizing of magma causes igneous rocks to form.

337.92 moles of Ozone will be produced

1 Oxygen atom is 8 g

1 mole of ozone, O3 = 8 * 3 = 24 g

7.92 * 1024 = 8110.08 g

1 mole = 24 g

? moles = 8110.08 g

? = 337.92 moles

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Ozone has a molecular formula of O3. If 7.92*1024 atoms of oxygen react to form ozone, then 337.92 moles of ozone will produce.

Molecular formula is defined as an expression that defines a number of atoms of each element in one molecule of a compound.

It can also be defined as a chemical formula that gives the total number of atoms of each elements in each molecules of a substance.

Ozone is defined as a highly reactive gas composed of three oxygen atoms and form a layer above the earth surface called as ozone layer.

1 oxygen atom = 8 g

1 mole of ozone = 8 x 3 = 24 g

7.92 x 10²⁴ = 8110.08 g

24 g = 1 mole

So, 8110.08 g = 337.92 moles

Thus, Ozone has a molecular formula of O3. If 7.92*1024 atoms of oxygen react to form ozone, then 337.92 moles of ozone will produce.

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Note the signs of equilibrium:-

So

if

Concentration of A is 2M then concentration of B should be same .

So equilibrium constant K is 1

[tex]\\ \rm\rightarrowtail K=\dfrac{[Products]^a}{[Reactants]^b}[/tex]

So

The equilibrium constant K is the ratio of product of molar concentrations of products to the product of molar concentrations of reactants. The concentration of B in the given reaction is 0.0031 M.

Rate of a reaction is the rate of decrease in the concentration of the reactants or rate of increase in the concentration of products.

Consider the simple reaction A ⇄2B, the rate of the reaction can be written as follows:

rate = K [A]

Where, k is the equilibrium constant or rate constant and [A] is the concentration of reactant A. If A have any coefficients, then the coefficient number is written as power of the concentration term.

The equilibrium constant K = [B]²/ [A] it is given 4.87 ×10⁻⁶ . Thus concentration of B can be calculated as follows:

[B]² = K [A]

       = (4.87 ×10⁻⁶)×2.00 M

       =9×10⁻⁶

  [B] = 0.0031 M

Hence, the concentration of the product B is 0.0031 M.

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Answer:

Explanation:

This is not my photo. I got it from this website.

https://pubchem.ncbi.nlm.nih.gov/compound/Chlorocyclohexane#section=2D-Structure

Answer:

O place them in a flame dissolve them in water o add more particles to the solution.

Answer:

Explanation:

Calculate the pH of a hydrochloride acid solution, HCl, whose hydronium ion (H3O)+ concentration is 8.29 X 10-4 M.

Note: answer should have three significant figures

Picture 1 shows choice B

Explanation:

picture 1 shows the car to which the net force is a zero

Answer:

The name of it is Sulfur Hexafluoride

Explanation:

Bonus fact: It is over 5 times heavier than air so when inhaling it, it makes your voice go very deep. The opposite of helium some would say

The percentage by mass of each of the compounds would be 40%, 2.6%, 4%, and 20% respectively

The percentage by mass of a substance is given by:

Percent by mass = mass of substance/mass of solution x 100%.

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Answer:

12.6 g O2 or

12.60 g O2 (if needed two decimal places)

Explanation:

First convert grams into moles:

17.4 g KCl × 1

74.55

= 0.233 moles of KCl

Next solve for the mole of O2:

= 0.233 × 3 moles of O2

2 moles of KCl

= 0.3495 or

= 0.350 moles of O2

Finally convert the mole to grams:

= 0.350 moles of O2 × 36g

1 mole

= 12.6 g O2 or 12.60 g O2

Answer:

a car traveled 20m &400k/g

Answer:

An adult male is between 2.4-3m (8-10 feet) in size and weighs between 350-680kg (775-1500lbs). Females are slightly smaller at around 1.8-2.4m (6-8 feet) and weigh between 150-250kg (330-550lbs).

Answer:

option B

cementation and compaction

The ideal gas equation can be used to obtain the pressure, number of moles, volume and temperature of a gas.

The ideal gas equation gives the relationship between pressure, number of moles, volume and temperature.

To obtain the number of moles of PH3

PV = nRT

n = PV/RT

n = 0.80 atm * 1.50 L/0.082 atmL/Kmol * 298 K

n = 0.049 moles

Number of moles of O2

PV = nRT

n = PV/RT

n = 0.100 atm *  2.28L /0.082 atmL/Kmol * 293 K

n = 0.0095 moles

Fom the reaction equation;

4 moles of PH3 reacts with 8 moles of O2

0.049 moles of PH3 reacts with  0.049 moles * 8/4 moles

= 0.098

Hence O2 is the limiting reacatant.

Mass of P4O10 produced =

8 moles of O2 yields 1 mole of P4O10

0.0095 moles  of O2 yields 0.0095 moles  * 1 mole/8 moles

= 0.0012 moles

Mass of P4O10  = 0.0012 moles * 284 = 0.34 g

Mass of water;

8 moles of O2 yields 6mole of water

0.0095 moles  of O2 yields 0.0095 moles * 6 moles/8 moles

=0.0071 moles

Mass of water = 0.0071 moles * 18 g/mol = 0.13 g

Since 4 moles of PH3 reacts with 8 moles of O2

x moles of PH3 reacts with 0.0095 moles  of O2

x = 0.0048 moles

Moles of PH3 left over = 0.049 moles - 0.0048 moles = 0.0442 moles

Mass of PH3 left over = 0.0442 moles * 34 g/mol

= 1.5 g

No mass of O2 is left over because the limiting reactant is used up.

Total moles of gas left after the reaction = 0.0442 moles +  0.0071 moles = 0.0513 moles

P = nRT/V

P = 0.0513 moles * 0.082 atmL/Kmol * 295.5/3.88L

P= 0.32 atm'

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Answer:

you are looking at the official nkana fc website

Answer:

Explanation:

On the reactant side, XeO3 is a strong oxidizing agent. It can be a solid or gas. Most likely it is in a solid state.

H+ and Br- combine to form HBr which is a weak acid. So H+ and Br- are in an aqueous state.

On the product side, both Br2 and Xe are not very soluble in water. They will be in gaseous state and H2O is water i.e. liquid state.

Answer:

The object is moving away from the origin.

Explanation:

Answer:

The object is moving away from the origin

The object started at 2 meters.

The object is traveling at a constant velocity.

Explanation:

The line on the graph is moving in the upward direction which means the farther right on the graph you go the farther up the line is. The line also has a constant slope which indicates that the object is moving at a constant rate. and if you look at x=0 the y=2 so therefor the object started at 2 meters.

Answer:

The answer is the Sodium Chloride.

Explanation:

A solute is the minor component in a solution, dissolved in the solvent, and the sodium is being dissolved in water ( or the solvent).

A chemist adds 36.0 g of sodium chloride to 200 g of water at STP and all of the sodium chloride dissolves, in this scenario sodium chloride is solute.

Those substance which are present in the solution relatively in less amount is known as solute.

In the question given that 36 grams of sodium chloride is added in the 200 grams of water. From this it is clear that sodium chloride is a solute and water is a solvent, which additionally makes a solution.

Hence, sodium chloride is a solute.

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Based on the distillation data provided, the percent recovery of ethanol is 66.7%

Distillation is a separation technique which is used to separate two miscible liquids based on differences in their boiling points.

At the boiling point of the first liquid, it distills over and is obtained by condensation.

The liquid obtained is known as distillate.

In the distillation of ethanol, the percent recovery is calculated as follows:

From the data given:

Percent Recovery = (300/450) × 100%

Percent recovery = 66.7%

Therefore, the percent recovery of ethanol is 66.7%.

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Answer:

HI>HBr>HCL>HF

Explanation:

Answer:

Combination reactions

Explanation:

Hope this helps:)