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?

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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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.

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

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

(B) Mixture b is a type of  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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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.

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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.

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

C₁V₁/C₂V₂ = na/nb

Where;

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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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

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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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.

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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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.

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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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.

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

Some organic acids are their sources are given below:

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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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.

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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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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nswer

C. Cr₂O₃ (s)

Explanation

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

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

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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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.

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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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.

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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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

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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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]

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

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.

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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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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