You mix a solution with 17.1 grams NaCl, 29.8 grams NaHCO3, and 105 grams of water. What is the mass percent of NaCl in this solution?

Answers

Answer 1

Answer:

45.2662%

Explanation:

The sum of the chemicals (sodium chloride) and (Baking powder) and (water) is 151.9, The Salt(sodium chloride) is 29.8 grams and as a percent is 0.298%. 151.9x0.298=45.2662%, happy to help any other time!


Related Questions

balance the equation
S(s) + O2(g)

Answers

Answer:

- Balancing equation must encounter the equality in moles of both reactants and products. (The left hand side must be equal to the right hand side)

- For the low concentration of oxygen, sulphurdioxide is produced and equation is balanced as below

[tex]{ \rm{S _{(s)}+ O _{2(g)} → SO _{2(g)}}}[/tex]

- For high oxygen concentration, sulphurtrioxide is produced and equation is balanced as below;

[tex]{ \rm{2S _{(s)}+ 3O _{2(g)} →2 SO _{3(g)}}}[/tex]

1. Which element listed below should have chemical properties similar to carbon (C)?
a. Li b. Si c. Br d. Ne

Answers

Si (Silicon) because it is in the same group as carbon.

A pH change can be evidence that

Answers

The pH change of a solution is practical evidence that a chemical change has occurred such that a solution is more acidic or basic.

What is meant by pH of a solution?

The pH of a given solution can simply be defined as the degree of acidity or alkalinity of the solution indicating that the chemical composition of the substance has changed. The pH scale is from 0 to 14.

An acid is a substance which when dissolves in water, it produces hydrogen ion as the positive ion.A base or alkaline produces hydroxyl ion as the only positive ion when dissolved in water.

So therefore, when the pH of a substance changes from one point to another, it confirms that it is either more basic or acidic.

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Calculate the mass of ammonia NH3 that contains a billion 1.0x10^9 hydrogen atoms.

Answers

1.0x10^9 H atoms x 1 molecule NH3/3 H atoms x 1 mol NH3/9.02x10^23 molecules x 17 g/mol = 9.4x10^-18 g NH3.

The mass of the formula is obtained by summing the masses of the individual atoms in the compound's formula. Correct chemical formulas are electrically neutral no net gain or loss of electrons so ions can be considered atoms in chemical formula mass calculations. The formula mass of a molecule is the sum of the atomic weights of the atoms in the compound's molecular formula.

Ammonia is formed from three hydrogen atoms and one nitrogen atom. Therefore, three hydrogen atoms each share one electron with nitrogen to form three covalent bonds, forming one ammonia NH3 ammonia molecule. The total mass of a compound is the sum of the masses of two hydrogen atoms and one oxygen atom. Your mass is the same wherever you go in space. Weight, on the other hand, varies from place to place.

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Use this reaction to answer the questions and explain :
CO(g)+2H2(g)-CH3OH(g) Delta H= -91.8kJ

1- If the pressure increases, what is the effect on the value of the equilibrium constant k?
2- If the pressure increases, Will the concentration of H2 increase , decrease or stay the same ? Why?

Answers

1) If the pressure increases, the equilibrium constant K does not change.

2) If the pressure increases, the concentration of H₂ decreases.

The reaction is given by:

CO + 2H₂    ⇄   CH₃OH            ΔH = -91.8 KJ

1) If the pressure increases, the equilibrium constant K does not change because the only factor affect the equilibrium constant k is the temperature.

2) If the pressure increases the equilibrium position shifted to right and increases the yield of product for this reaction .

                p ∝ n

Thus, using the given reaction

CO + 2H₂    ⇄   CH₃OH            ΔH = -91.8 KJ

1) If the pressure increases, the equilibrium constant K does not change.

2) If the pressure increases, the concentration of H₂ decreases.

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An RNA virus is a virus that has RNA as its genetic material. The base compositions of two
kinds of RNA viruses are the following:
RNA virus (#1) 20.2% A, 20.0% U, 29.8% G, and 30.0% C.
RNA virus (#2) 12.2% A, 37.8% U, 12.2.% G, and 37.8% C.
Which of the following correctly describes the genetic materials of these two DNA viruses

Answers

Based on the base composition of the two kinds of RNA viruses, Therefore, in virus 1, A pairs with U while G pairs with C, whereas in virus 2, A pairs with G while U pairs with C.

What is RNA?

RNA is one of the two genetic materials that living organisms use to store genetic information. The second genetic material is DNA.

RNA is the genetic material whose sugar backbone is ribose sugar.

Also, one of the four nucleotides in RNA is Uracil.

These are differences between RNA and DNA whose sugar backbone is deoxyribose and where the nitrogenous base in place of uracil is thymine.

RNA forms the genetic material in some viruses, whereas DNA is the genetic material in other living organisms.

RNA viruses are known as retroviruses.

In base pairing in RNA, A pairs to U, while G pairs to C. Therefore, the ratio of the two base pairs is always equal.

Considering the two RNA viruses given;

The base compositions of two kinds of RNA viruses are as follows:

RNA virus (#1) 20.2% A, 20.0% U, 29.8% G, and 30.0% C.

RNA virus (#2) 12.2% A, 37.8% U, 12.2.% G, and 37.8% C.

Comparing the  base compositions of the two viruses:

Virus 1 has equal ratios of the base pairs, A and U, as well as G and C.

Virus 2 has equal ratios of the base pairs, A and G, as well as U and C.

This means the base pairing in virus differs from the base pairing in virus 2.

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Question 10 of 40
At equilibrium, a reaction vessel contains 4.50 atm of Br2 and 1.10 atm
of NBr3. According to the reaction: 2 NBr3 (g) = N2 (g) + 3 Br₂ (g) Kp = 4.8

Determine the equilibrium partial pressure of N2.

Answers

The equilibrium partial pressure of Nitrogen would be 0.0638 atm when a reaction vessel contains 4.5 atm of Br2 and 1.1 atm of NBr3.

What is equilibrium and equilibrium partial pressure and how it comes out to be 0.0638 atm for Nitrogen?As always studied in earlier classes equilibrium is a state of equality between the reactant and product .Equilibrium is a condition where the rate of formation of reactant is equal to the rate of formation of product.Partial pressure is the pressure exerted by individual molecule of the container contained gas.The total pressure is the total pressure exerted by total molecules of the container.Here Kp= P N2 x( P Br 2 )^3/ p ( NBr3) ^2, 4.8 = ( PN2) (4.50)^3/(1.10)^2 , 5.8.8 = 91.125 ( PN2) = 0.0638 atm.

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Now we will examine a more complex system. Watch the animation portraying the combustion of propane. The unbalanced chemical equation is given below.

__ C3H8(g) + __O2(g) → __CO2(g) + __H2O(ℓ)

Begin by balancing an element that appears in the fewest different formulas. What coefficient must be added to the CO2 to balance the element C?

Answers

By balancing the element that appears in the fewest different formulas of the combustion reaction of propane, the coefficient that must be added to the CO₂ to balance the element C is 3.

What is a combustion reaction?

A combustion reaction is a reaction that involves the release of large amounts of heat and light energy.

Combustion reactions include the burning of hydrocarbons in the air to produce carbon dioxide and water.

Considering the given question below:

What is the balanced equation of the reaction for the combustion of propane?

The balanced equation of the reaction for the combustion of propane is given below as follows:

C₃H₈ (g) + 5 O₂ (g) ---> 3 CO₂ (g) + 4 H₂O (l)

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I need help with this homework assignment problem ​

Answers

Answer:

A. The ion is Ar^2+

B. 18

C. 0

Explanation:

There are total of 2 + 2 + 6 + 2 + 4 = 16 electrons

since the cation is +2, it's neutral state should be 16 + 2 = 18

A. The ion is Ar^2+

B. 18

C. 0

Which of the following words/phrases can be used to describe table salt (NaCl)? Select all that apply.ElementCompoundPure substanceMixture

Answers

Let's see the definition of each concept:

An element is a substance only formed by atoms of the same element. For example, Na (sodium), O2 (oxygen), C (carbon).

A compound is a substance formed by the combination of two or more elements, through a chemical bond. For example, H2O (water), and CO2 (carbon dioxide).

A pure substance can be an element or a compound, which is alone in the media. For example, the O2 present in an oxygen bullet is pure, because it is only oxygen.

A mixture is when you have 2 or more elements or compounds present in the same media. For example, the air is a mixture of oxygen and nitrogen.

Then, the answer is that NaCl is a compound and a pure substance.

help me please if you can

Answers

nswer

C. Cr₂O₃ (s)

Explanation

[tex]Cr_2O_3(s)+2Al(s)\rightarrow2Cr(s)+Al_2O_3(s)[/tex]

An oxidizing agent is a substance that causes oxidation by accepting electrons; therefore, its oxidation state decreases.

A reducing agent is a substance that causes reduction by losing electrons; therefore its oxidation state increases.

The simplest way to answer this is that the oxidizing agent is the substance that is reduced, while the reducing agent is the substance that is oxidized.

Therefore, CrA

Determine the number of atoms of C in 25.6 grams of C₁₂H₂₂O₁₁

Answers

There are 5.403×10[tex]^23[/tex]  atoms of carbon in 25.6 grams of sucrose which is in relation with the number of moles.

What is a mole?

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Number of atoms  of carbon can be determined by calculating number of moles of carbon which is 25.6/242.3=0.074 moles .As 1 mole has 6.022×10[tex]^23[/tex]  atoms

∴0.074 moles has 4.503×10²² moles

Number of carbon atoms in 1 molecule of sucrose is 12

∴number of carbon atoms in 4.503×10²² molecules is 12×4.503×10²²=5.403×10²³ atoms

Therefore, there are 5.403×10²³ atoms in 25.6 g of sucrose.

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Good question for compound

Answers

Why does the Law of Composition mainly applies to compounds?

Determining the Concentration of Citric Acid in 7-Up (soft drink) Using Acid-Base Titration. Titration of 7-Up:
1. Obtain 50 mL of your soft drink sample. The soft drink samples in your lab have been opened several days in advance to assure it is decarbonated.
2. Add 10 mL of the soft drink into a clean 250 mL Erlenmeyer.
3. Add 2 to 3 drops of phenolphthalein.
4. Fill your burette with the standardized NaOH.
5. Add the NaOH solution to the soft drink until the first faint lasting pink color
appears.
6. Repeat this part two more times.
7. Calculate the molarity of the citric acid in the soft drink.

And Calculate the w/v% for citric acid in the soft drink.

Answers

The molarity of the citric acid in the soft drink is 0.00385M and the w/v% for citric acid in the soft drink is 7.99 g/L

Citric acid occur naturally in lemon, limes, pineapples and citric acid used as a flavoring and preserving agent and here given experiment are given obtain 50 mL of your soft drink sample the soft drink samples in your lab have been opened several days in advance to assure it is decarbonated. add 10 mL of the soft drink into a clean 250 mL Erlenmeyer add 2 to 3 drops of phenolphthalein fill your burette with the standardized NaOH add the NaOH solution to the soft drink until the first faint lasting pink color appears repeat this part two more times and then the molarity of citric acid in soft drink are 0.00385M and we have to calculate w/v% for citric acid in the soft drink = ?

So w/v% = g of solute/ 100ml of solution = 39.99/100×20 = 7.99 g/L

Concentration of citric acid in soft drinks are 7.99g/L

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Because you want to study how botulinum toxin works, but you do not want to paralyze an animal, you decide to determine the effect of botulinum toxin on yeast. Botulinum toxin has a MW= 149323.05 and you have a 5ml stock bottle that contains 70% w/v botulinum toxin, 50mL of yeast growing in a liquid culture, and 25ml H2O. Your lab protocol performs treatments in 500µL samples.

Answers

The effect of botulinum toxin cannot be determined using a yeast.

Botulinum toxin is produced by the bacterium called Clostridium botulinum. It is a neurotoxin that affects the nervous system. It is done by inhibiting a chemical called as acetylcholine.

Acetylcholine is a neurotransmitter that carries the message from the brain. It relays the message thus resulting in movement. If it is inhibited, the person would be paralyzed.

Yeast is a single-celled organism. It does not have well-developed systems as in multicellular organisms. In addition to that, the test organisms used to measure the effect of toxicity should be similar genetically to humans which would result in higher efficiency.

Thus, yeast cannot be used to determine the effect of botulinum toxin

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i need help with chemistry equation

Answers

The theoretical yield of the reaction is 12.1 g and the percent yield  of the reaction is 77.4%.

What is the percentage yield of the calcium sulfate?

Let us recall that when we are carrying out any kind of calculations that involves the substances that are used or formed in a reaction we must have to make recourse to the stoichiometry of the reaction. This is where the relationship between the reactants and the products could be understood well here.

Now we have the chemical reaction equation as;

[tex]H_{2} SO_{4} (aq) + CaOH(aq) ----- > CaSO_{4} (s) +H_{2} O(l)[/tex]

We can see that the reaction can be found to be 1:1 from the reaction equation as shown.

Number of moles of calcium hydroxide = 6.56 g/74 g/mol = 0.089 moles

It then follows that the limiting reactant is calcium hydroxide.

Theoretical yield of the calcium sulfate = 0.089 moles * 136 g/mol = 12.1 g

Then the percent yield = 9.37 g/12.1 g * 100/1

= 77.4%

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please help fast
The table compares some characteristics of two atoms.

Use the table to determine the number of protons for each atom. Then, choose the statement below that is true about the two atoms.

Answers

Answer:

C. Atom X and atom Y are in the same row on the periodic table

Explanation:

The number of protons in each atom:

X = 7 - 4 = 3 which is Li

Y = 9 - 5 = 4 which is Be

A. wrong because X and Y are not in same family

B. wrong because Y is in the column to the right of X

D. wrong because X and Y are not the same element

True or false. An ion is an electrically neutral atom that has the same number of protons and neutrons

Answers

Answer:

False

Explanation:

Atoms are neutral Ions carry a charge. Take a look at the groups in the periodic table for extra help in understanding this.

A geologist determines that a rock is approximately 123,000,000 years old. Which of the following is the correct way to express the number in scientific notation?

Answers

The correct way to express the number 123,000,000 years old in scientific notation is 1.23 x 10⁸.

What is Scientific notation?

This is referred to as a way of expressing numbers which are too large or too small and is often difficult to write them in decimal form. An example of such large numbers is 123,000,000.

This type of numbers can be written in the powers of 10 which helps compress it into smaller forms.For example 1000 can be written in the form 1 × 10³ which when expressed will still give the same result.

In the case of 123,000,000, we count from the back and put the decimal point between the firs two digits and the number counted is then expressed as the power of the number being expressed. We count eight times to get to 1.23 which is then expressed as 1.23 x 10⁸ therefore making it the correct choice.

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30cm3 of 0.1m HCl (aq) were titrated against 25cm3 of a solution containing 15.0g/dm3 of a mixture of NaCl and KHCl and KHCO3.
1.Calculate concentration of KHCO3 in mol/dm3​
2.Mass of KHCO3 in g/dm3
3.Percentage Purity of KHCO3

Answers

Titration is a common laboratory method for quantitative chemical analysis to determine the concentration of an identified analyte. The reagent, sometimes referred to as the titrant or titrator, is prepared as a standard solution with a specified concentration and volume.

Titration is the continuous addition of one solution with a known concentration (referred to as a titrant) to a known volume of another solution with an unknown concentration when a reaction reaches neutrality, which is occasionally marked by a color change.

Utilizing methyl orange indicator, a sodium carbonate solution and a hydrochloric acid solution can be titrated. The solution will be mildly acidic at the end point when a weak base is titrated with a strong acid. The solution becomes slightly basic when a weak acid is titrated with a strong base because the salt that results will partially hydrolyze.

Below is a list of the chemical processes that took place during this titration.

NaCl(aq) + CO2(g) + H2O → Na2CO3(aq) + 2HCl(aq)

CO2(g) + H2O  →  CO32-(aq) + 2H+(aq)

Acid and base titrations have an end point when the acid and base amounts are chemically identical. When a strong acid and a strong base are titrated, the solution neutralizes at the end point.

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Someone please help me with this. . .

Answers

I rounded the answer. The average atomic mass of Cl is 35.45

A sample of gas has a volume of 2.50 L at 536 kPa and 75.0 °C. What is the pressure (in atm) of the gas if it expands to 3.75 L at 25.0 °C?

Answers

Answer:

P₂ = 1.18 atm

Explanation:

To find the final pressure, you need to use the Combined Gas Law equation:

[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]

In this equation, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the final pressure, volume, and temperature. After plugging the given variables into the equation, you can simplify/rearrange the equation to solve for "P₂".

P₁ = 536 pKa                     P₂ = ? pKa

V₁ = 2.50 L                        V₂ = 3.75 L

T₁ = 75.0 °C                       T₂ = 25.0 °C

[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]                                               <----- Combined Gas Law

[tex]\frac{(536 pKa)(2.50L)}{75.0^oC} =\frac{P_2(3.75 L)}{25.0^oC}[/tex]                          <----- Insert variables

[tex]17.87 =\frac{P_2(3.75 L)}{25.0^oC}[/tex]                                        <----- Simplify left side

[tex]446.7 = P_2(3.75 L)[/tex]                                      <----- Multiply both sides by 25.0

[tex]119 = P_2[/tex]                                                    <----- Divide both sides by 3.75

Finally, you need to convert the pressure from kilopascals (pKa) to atmospheres (atm).

101.3 pKa = 1 atm

 119 pKa                1 atm
---------------  x  --------------------  =  1.18 atm
                          101.3 pKa

Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used here. Therefore the new pressure of  gas is 1.18 atm.

What is ideal gas equation?

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of  gas

V= volume of gas

n =number of moles of gas

T =temperature of gas

R = Gas constant = 0.0821 L.atm/K.mol

Combining Boyle's and Charles' gas law

P₁V₁/T₁ = P₂V₂/T₂

{ (5.28atm) (2.50 L)} ÷348 K ={ (P2) (3.75 L)} ÷298 K

P2 =1.18 atm

Therefore the new pressure of gas is 1.18 atm when the temperature is changed to348K and volume is increased to 3.75 L.

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4.
5.
Base your answer(s) to the following question(s)
on the information below and on your knowledge
of chemistry.
A student prepares two 141-gram
mixtures, A and B. Each mixture consists
of NH4Cl, sand, and H₂O at 15° C. Both
mixtures are thoroughly stirred and allowed
to stand. The mass of each component used
to make the mixtures is listed in the data table below

Answers

(A) Sand is un soluble in water . NH4Cl is soluble in water.

(B) Mixture b is a type of  heterogenous mixture.

What is a heterogenous mixture?

A mixture with an inhomogeneous composition is referred to be heterogeneous. There are at least two distinct phases that continue to exist with distinct features that vary in composition from one place to another. It is possible to distinguish the individual components of a heterogeneous mixture by looking at a sample.

The concept of a heterogeneous mixture is somewhat different in physical chemistry and materials science. A homogeneous mixture in this context is one in which each component is in a single phase, as opposed to a heterogeneous mixture, which has components in many phases.

A mixture is any combination of two or more chemically unaltered, pure substances that has not been altered in any way from its original state. Unlike other types of combinations, heterogeneous ones do not blend and have an uneven makeup.

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In the longstanding war between coyotes and sheep ranchers in New Mexico, studies show that coyotes kill sheep. The percentage of sheep lost from
herds in areas where coyotes have been exterminated (killed off) is about the same as the percentage lost in areas where coyotes are still present.
What is the most likely explanation for the similarity on the percentage of sheep lost in bother areas. Coyotes were protective sheep. Another predator it was killing sheep. Did she die from overcrowding. Coyotes we’re praying on sicker week sheep

Answers

In the longstanding war between coyotes and sheep ranchers in New Mexico, studies show that coyotes kill sheep. The most likely explanation for the similarity in the percentage of sheep lost in other areas is that Another predator was killing sheep. Option B

This is further explained below.

What is a predator?

Generally, A biological relationship known as predation occurs when one creature, known as the predator, hunts down and consumes another organism, known as the prey.

It belongs to the same group of common feeding behaviors as parasitism, micropredation, and parasitoids. Parasitism is a subtype of parasitoids.

In conclusion, Studies have shown that coyotes are the aggressors in the conflict that has been going on for a long time in New Mexico between sheep farmers and coyotes.

The hypothesis that another kind of predator was responsible for the loss of sheep in the same proportion in other locations is the one with the highest probability of being correct. Alternative B

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Multiply 643.78 quarts by 4.3562. What is the answer in the correct significant figures?

Answers

Calculated with significant figures is 2804.4, which contains 5 sig figs and 1 decimal.

Three rules are used to determine the number of significant digits Non-zero numbers are always valid. All zeros between two significant digits are valid. Only trailing zeros or trailing zeros in the fractional part are significant. Enter a number or formula to calculate the number of digits and decimal places in your answer. contains 1 significant digit.

All zeros between two non-zero digits are valid. For example, 108.0097 contains 7 significant digits. Zeros to the right of the decimal point and to the left of non-zero digits have no meaning. For example, 0.00798 contained 3 significant digits. For example, the 3-digit power of 20,499 is 20,500. The first digit to round down is 9 so round up. 0.0020499 to 3 significant digits are 0.

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Hydrochloric acid reacts with potassium hydroxide, according to the following equation:

HCl + KOH → KCl + H2O

If 15 cm3 of 0.5 M HCl are exactly neutralized with 24 cm3 of solution of
KOH. What is the concentration of the KOH solution?

Answers

The concentration of KOH solution if 15 cm³ of 0.5 M HCl are exactly neutralised with 24 cm3 of solution of KOH is 0.313M.

How to calculate concentration?

The concentration of a solution can be calculated by using the following formula;

C₁V₁/C₂V₂ = na/nb

Where;

C₁ = initial concentrationV₁ = initial volumeC₂ = final concentrationV₂ = final volumena = number of moles of acidnb = number of moles of base

According to this question, a reaction between hydrochloric acid and potassium hydroxide forms water and potassium chloride as follows:

HCl + KOH → KCl + H2O

This suggests that na and nb values are both 1.

15 × 0.5 = 24 × C₂

7.5 = 24C₂

C₂ = 7.5/24

C₂ = 0.313M

Therefore, the concentration of KOH solution if 15 cm³ of 0.5 M HCl are exactly neutralised with 24 cm3 of solution of KOH is 0.313M.

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Calculate the mass of water produced if 12.1 g of ethanol (C2H6O) undergoes the reaction below:

C2H6O (l) + O2 (g) → CO2 (g) + H2O (l)

Answers

The mass of water produced if 12.1 g of ethanol (C₂H₆O) undergoes the reaction is 14.2 g.

Ethanol is a natural compound. it is simple alcohol with the chemical components C₂H₆O. Its formula may be also written as CH₃−CH₂−OH or C₂H₅OH. Ethanol is a risky, flammable, colorless liquid with a characteristic wine-like odor and smelly taste.

Ethanol is used in the manufacture of medication, plastics, lacquers, polishes, plasticizers, and cosmetics. Ethanol is used in medicine as a topical antiinfective, and as an antidote for ethylene glycol or methanol overdose.

Balancing the reaction,

C₂H₆O (l) + 3O₂ (g) → 2CO₂ (g) + 3H₂O (l)

Mass of ethanol given = 12.1g

the molar mass of ethanol = 46 g

Therefore given mole = 46/12.1

                                    = 3.80 mole.

1 mole of ethanol = 3 moles of H₂O

∵ 46 g of ethanol = 54g of water

∴ 12.1 g of ethanol = 54g / 46 g × 12.1 g

                               = 14.2 g of ethanol produced.

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Heavy metal ions like lead(II) can be precipitated from laboratory wastewater by adding sodium sulfide, Na2S. Will all the lead be removed from 11.8 mL of 7.40×10-3 M Pb(NO3)2 upon addition of 13.7 mL of 0.0117 M Na2S? If all the lead is removed, how many moles of lead is this? If not, how many moles of Pb remain?

Answers

All the lead ions will not be removed and 6.502 ×10-8 moles of lead ions remain in solution.

The equation of the reaction is;

Pb(NO3)2(aq) +  Na2S(aq) ---------> PbS(s) + 2NaNO3(aq)

Number of moles of Pb(NO3)2 = concentration × volume

Number of moles of Pb(NO3)2 = 11.2 mL/100   × 7.10×10-3 M = 7.952 ×10-8 moles

Number of moles of  Na2S = 12.4 mL/1000 ×  0.0117 M = 1.45  × 10-8 moles

Since the reaction is 1:1, 7.952 ×10-8 moles of Pb(NO3)2 should react with  7.952 ×10-8 moles of Na2S in order to remove all the Pb^2+ ions but we have only 1.45  × 10-8 moles of  Na2S  hence all the lead ions will not be removed.

Amount of lead ions remaining =  7.952 ×10-8  -  1.45  × 10-8 moles

= 6.502 ×10-8 moles of lead ions

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15 organic acids and their sources

Answers

Some organic acids are their sources are given below:

Lactic acid - milkascorbic acid - fruitsoxalic acid - grapescitric acid - citrusacetic acid - vinegarpyruvic acid - glycolysisfumaric acid - TCA cycleaspartic acid - proteinsglutamic acid - proteinssuccinic acid - TCA cyclemaleic acid - TCA cycleTartaric acid - grapesUric acid - ureaformic acid - antsglucuronic acid - glucose

What are organic acids?

Organic acids are acids that are obtained from organic sources or living organisms.

Organic acids unlike inorganic acids are usually weak acids.

Organic acids are important in living organisms and play several roles such as in proteins or in lipids.

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A gas has a temperature of 400. K, a pressure of 50.0 kPa, and a volume of 3.00 L. The volume is doubled while the temperature is held con- stant, and then the temperature is halved while the pressure is held constant. Use the gas laws to deter- mine the final temperature, pres- sure, and volume of the gas.​

Answers

The, new volume is 1200 L and new pressure is 25 kPa.

Given, temperature = 400 K

Pressure = 50 kPa

Volume = 3 L

V1/T1 = V2/T2

V2 = V1×T2 / T1

V2 = 400× 6/ 2

V2 = 1200 L

Hence, new volume is 1200 L.

P1/T1 = P2/T2

P2 = P1 × T2/ T1

P2 = 50 × 1000 × 200/ 400

P2 = 25000 Pa

Hence, new pressure is 25 kPa.

A gas is a set of molecules that do not cohere strongly sufficient to form a liquid or a strong. The quantity of a gas is, so long as the molecules fit into it, the extent of the container preserving the gas. In different phrases, the extent of a gas isn't always a belongings of the gas immediately, however a belongings of the box.

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