Calculate the percentage by mass of lead in Pb(NO3)2. Calculate the percentage by mass of lead in Pb(NO3)2. 65.3 62.6 44.5 71.2 38.6

Answer:

2

Explanation:

Panthenol (or provitamin B5) is an active ingredient used as a moisturizer, in particular, to treat sensitive and dry skin. It also goes into the hair care formulation to nourish dry hair. All the benefits of this precursor of vitamin B5.

It has moisturizing, anti-inflammatory, regenerating, and healing properties. Panthenol also strengthens the hydrolipidic film, improves the elasticity of the skin, and promotes cell renewal in the event of injuries: this is why it is also used in the event of injuries or sunburn.

Thus, from the image below, the structure of Panthenol is being shown and the number of possible stereoisomers is being outlined as well.

Answer: A) Cold ice makes the liquid condense

On the flip side, warm temperatures make the liquid expand. Since there is only one direction to go, the liquid expands upward until it reaches a certain marker on the thermometer, to indicate the temperature.

Answer:

87.0

Explanation:

Hopes this helps

Answer:

Cleavage and Fracture

Explanation:

Cleavage and Fractures are both characteristics used to determine a type of mineral, along with hardness, luster, color, streak, specific gravity, and tenacity, all of which not included in the answers.

A.THERMOMETERS SEISMIC WAVES

Answer:

Molecular Formula

P4S6

Molecular Weight

316.3 g/mol

P[tex]_4[/tex]S[tex]_6[/tex] is the chemical formula of tetraphosphorus hexasulfide. These can only include one typographic line containing symbols.

A chemical formula is a way to describe the chemical ratios of the atoms that make up a specific chemical compound or molecule in chemistry. Chemical element numbers, symbols, and on occasion other symbols, including parentheses, dashes, brackets, commas, and plus (+) and minus () signs, are used to represent the chemical elements. Which may also include subscripts or superscripts. Since a chemical formula inherently wordless, it cannot be considered a chemical name. A chemical formula does not equal a complete chemical structural formula, despite the fact that it may suggest certain basic chemical structures. P[tex]_4[/tex]S[tex]_6[/tex] is the chemical formula of tetraphosphorus hexasulfide.

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The question is incomplete; the complete question is;

Liquid octane CH3CH26CH3 reacts with gaseous oxygen gas O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. If 2.80g of carbon dioxide is produced from the reaction of 3.4g of octane and 5.9g of oxygen gas, calculate the percent yield of carbon dioxide. Be sure your answer has the correct number of significant digits in it.

Answer:

55%

Explanation:

The balanced equation is:

C8H18(g) + 25/2O2(g) ----------> 8CO2(g) + 9H2O(g)

The limiting reactant IS first determined. This is the reactant that yields the least amount of product.

3.4 g octane / 114 g/mol = 0.030 mol octane

From the reaction equation;

1 mole of octane yields 8 moles of CO2

0.030 mol octane yields 0.030 * 8/1 = 0.24 moles of CO2

5.9 g O2 / 32 g/mol = 0.18 mol O2

25/2 moles of O2 yields 8 moles of CO2

0.18 moles of O2 yields 8 * 0.18/25/2 = 0.1152 moles of CO2

Oxygen is the limiting reactant.

Number of moles of carbon dioxide produced (actual yield) = 2.8 g/44g/mol = 0.0636 moles of CO2

% yield = actual yield/ theoretical yield * 100

% yield =   0.0636/0.1152 * 100= 55%

Answer:

38.4%

Explanation:

Step 1 Obtain the concentration of Ca^2+ and SO4^2-

[Ca^2+] = 0.05 L (0.0125 mol/L) (1/0.1 L) = 6.25 * 10^-3 M

[SO4^2-] = 0.05 L (0.0152mol/L) (1/0.1L) = 7.60 * 10^-3 M

Step 2 Obtain the concentration of [SO4^2-]  left

         Ca^2+(aq)             +       SO4^2-(aq)------> CaSO4(s)

initial  6.25 * 10^-3 M             7.60 * 10^-3 M

final        0                               1.35 * 10^-3 M

Step 3 Determine the amount of Ca^2+ left from the common ion problem

                      CaSO4(s) --------> Ca^2+(aq)             +       SO4^2-(aq)

initial                                             0                                 1.35 * 10^-3 M

equilibrium                                    x                                (1.35 * 10^-3  + x) M

But Ksp of CaSO4 = 9.1 * 10^-6

Ksp = [Ca^2+] [SO4^2-]

9.1 * 10^-6= [x] [1.35 * 10^-3  + x]

9.1 * 10^-6= 1.35 * 10^-3 x + x^2

Rearranging:

x^2 + 1.35 * 10^-3 x + 9.1 * 10^-6 = 0

solving the quadratic yields x = 2.4 * 10^-3

Step 4 Calculate the amount of Ca^2+ remaining;

% Ca^2+ remaining = 2.4 * 10^-3/ 6.25 * 10^-3 M * 100

% Ca^2+ remaining = 38.4%

Explanation:

Water molecules form hydrogen bonding when the oxygen of one water molecule combines with the hydrogen of another molecule.

Hydrogen bonding is an electrostatic attraction between the hydrogen atom of one molecule and the electronegative atom of a neighboring molecule.

Answer:

Colloid = Condensed milk, Paint

Solution = brine

Suspension = flour and water

Explanation:

Colloid:

Colloid is a mixture in which smaller particles of one substance are evenly distributed throughout into another substance.

These particles are smaller than the particles present in suspension but larger than the particles present in solution.

Condensed milk is example of colloid.

Paint is also example of colloid in which pigment particles dispersed.

Solution:

In solution one or more substances are dissolved into the another substance. The substance which is being dissolved is called solute while the substance which has tendency to dissolve the other substance is called solvent. It is homogenous mixture.

Salty water is example of solution in which salt are solute dissolved in solvent which is water.

Suspension:

In suspension solute particles are not dissolved they are dispersed into bulk of solvent. The solute particles are larger then the particles present in colloid.

flour and water is the example of suspension.

Answer:

6.62 g of carbon.

Explanation:

We'll begin by calculating the molar mass of C6H12O6. This is illustrated below:

Molar mass of C6H12O6 = (12×6) + (12×1) + (16×6)

= 72 + 12 + 96

= 180 g/mol

Next, we shall determine the mass of carbon (C) in 1 mole (i.e 180 g) of C6H12O6. This is illustrated:

Mass of C in C6H12O6 = 6C = 12×6

Mass of C in C6H12O6 = 72 g

Thus, 180 g of glucose contains 72 g of carbon.

Finally, we shall determine the mass of carbon in 16.55 g of glucose. This can be obtained as follow:

180 g of glucose contains 72 g of carbon.

Therefore, 16.55 g of glucose will contain = (16.55 × 72)/180 = 6.62 g of carbon.

Thus, 16.55 g of glucose contains 6.62 g of carbon.

Answer:

0.41 M

Explanation:

A -> B

rate constant (k) = 0.039L/mol s

t = 23

Final concentration, [A]  = 0.30M

Initial concentration, [A]o = x

1 / [A]  = kt + 1 / [A]o

1 / [A]o = 1 / [A] - kt

1 / [A]o  = 1 / 0.30   - 0.039 (23)

1 / [A]  = 3.33 -  0.897 = 2.433

[A] = 0.41 M

Answer:

Its d

Explanation:

Got it correct

Answer:

d

Explanation:

did the test

Answer:

What ae the options?  

Explanation:

Answer:

The balanced chemical equation for the reaction can be computed as:

[tex]\mathbf{Cr_2O_3_{(s)}+ 3H_2S_{(g)} \to Cr_2S_3_{(s)} + 3H_2O_{(l)}}[/tex]

2.103 moles of [tex]Cr_2O_3_{(s)}[/tex]  is being required.

Explanation:

The balanced chemical equation for the reaction can be computed as:

[tex]\mathbf{Cr_2O_3_{(s)}+ 3H_2S_{(g)} \to Cr_2S_3_{(s)} + 3H_2O_{(l)}}[/tex]

Recall that numbers of moles = [tex]\dfrac{mass}{molar \ mass}[/tex]

∴

number of moles of Cr2S3 = [tex]\dfrac{421}{200.19}[/tex]

number of moles of Cr2S3 = 2.103 moles

It  obvious from the balanced equation that:

1 mole of [tex]Cr_2S_3_{(s)}[/tex] requires 1 mole of  [tex]Cr_2O_3_{(s)}[/tex]  

Thus; 2.103 moles of  [tex]Cr_2S_3_{(s)}[/tex]  = 2.103 × (1/1) moles of [tex]Cr_2O_3_{(s)}[/tex]  

= 2.103 moles of [tex]Cr_2O_3_{(s)}[/tex]  

Answer:

The true statement about Sir Isaac Newton is that he made a connection between the mass of objects and the distance between them. Hence option B is correct.

Mass is defined as a dimensionless number used to describe the mass of a particle or item. Gravity and inertia, which are the two main forces influencing how objects move in space, make mass crucial. A substance's mass, expressed in kilograms (kg), can be used to estimate its matter content.

Every item in the universe is attracted to one another by a force that is directly proportional to the product of the masses of the objects and inversely proportional to the distance between them, according to Newton's law of universal gravitation.

Thus, the true statement about Sir Isaac Newton is that he made a connection between the mass of objects and the distance between them. Hence option B is correct.

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Answer:

2 Na⁺(aq) + S²⁻(aq) + Fe²⁺(aq) + 2 NO₃⁻(aq) ⇒ FeS(s) + 2 Na⁺(aq) + 2 NO₃⁻(aq)

Explanation:

Let's consider the molecular equation that occurs when aqueous solutions of sodium sulfide and iron(II) nitrate are mixed.

Na₂S(aq) + Fe(NO₃)₂ ⇒ FeS(s) + 2 NaNO₃(aq)

The complete ionic equation includes all the ions and the species that do not dissociate in water.

2 Na⁺(aq) + S²⁻(aq) + Fe²⁺(aq) + 2 NO₃⁻(aq) ⇒ FeS(s) + 2 Na⁺(aq) + 2 NO₃⁻(aq)

The complete ionic equation for the reaction between aqueous solution of sodium sulfide and iron(II) nitrate is

2Na⁺(aq) + S²⁻(aq) + Fe²⁺(aq) + 2NO₃⁻(aq) —> FeS(s) + 2Na⁺(aq) + 2NO₃⁻(aq)

The complete ionic equation for the reaction between aqueous solution of sodium sulfide and iron(II) nitrate can be written as follow:

In solution, Na₂S and Fe(NO₃)₂ will dissociate as follow:

Na₂S(aq) —> 2Na⁺(aq) + S²¯(aq)

Fe(NO₃)₂(aq) —> Fe²⁺(aq) + 2NO₃¯(aq)

The reaction will proceeds as illustrated below to give the complete ionic equation:

Na₂S(aq) + Fe(NO₃)₂(aq)—>

2Na⁺(aq) + S²¯(aq) + Fe²⁺(aq) + 2NO₃¯(aq) —> FeS(s) + 2Na⁺(aq) + 2NO₃¯(aq)

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Answer:

THE ANSWER IS CORRECT!!

Answer:

1. The oxidation number of Li changes from 0 to +1

2. The oxidation number of Cu changes from +2 to 0.

3. The oxidation number of Cl remains the same in each compound.

Explanation:the equation for the reaction is given below:

Li(s) + CuCl2(s) —> LiCl(s) + Cu(s)

Next, we shall determine the oxidation number of each element in the reaction.

NOTE: 1. Oxidation number of chlorine (Cl) is always –1 in any compound because it is a ground 7 element.

Now, we shall determine the change in oxidation number of each element. This is illustrated below:

1. For Li:

Li = 0 (ground state)

LiCl = 0

Cl = –1

Li + (–1) = 0

Li – 1 = 0

Collect like terms:

Li = 0 + 1

Li = +1

The oxidation number of Li changes from 0 to +1

2. For Cu:

CuCl2 = 0

Cu + 2Cl = 0

Cl = –1

Cu + 2(–1) = 0

Cu – 2 = 0

Collect like terms

Cu = 0 + 2

Cu = +2

Cu = 0 (ground state)

The oxidation number of Cu changes from +2 to 0.

3. For Cl:

The oxidation number of Cl remains the same in each compound.

Summary:

1. The oxidation number of Li changes from 0 to +1

2. The oxidation number of Cu changes from +2 to 0.

3. The oxidation number of Cl remains the same in each compound

Answer:

c

Explanation:

Answer:

Binding properties

Explanation:

Answer:

[tex]\Delta G=8015\frac{J}{mol}[/tex]

Explanation:

Hello.

In this case, for the following chemical reaction in gaseous phase:

[tex]C_2H_4+H_2O\rightleftharpoons C_2H_5OH[/tex]

We can write the equilibrium expression as:

[tex]Kp=\frac{p_{C_2H_5OH}}{p_{H_2O}*p_{C_2H_4}}[/tex]

it means that given the pressures, we can compute Kp as shown below:

[tex]Kp=\frac{0.100atm}{0.275atm*0.350atm}=1.04[/tex]

Next, we compute Kc at 298 K:

[tex]Kc=\frac{Kp}{(RT)^{1-1-1}}=\frac{Kp}{(RT)^{-1}}[/tex]

Whereas 1-1-1 comes from the stoichiometric coefficients of products minus reactants. Therefore, Kc is:

[tex]Kc=\frac{1.04}{(0.08206*298)^{-1}}=25.4[/tex]

Thus, the Gibbs free energy for this reaction is:

[tex]\Delta G=RTln(kC)=8.314\frac{J}{mol*K}*298K*ln(25.4)\\ \\\Delta G=8015\frac{J}{mol}[/tex]

Best regards!

Answer:

Any thing that takes up space and has mass

Explanation:

Answer:

1.mass 2.space

Your welcome

Answer:

liquid to solid

Explanation:

liquid atoms are closer together but can slide past one then it starts to lose energy and locks in which in that case turns intl a solid.

Hopefully that helped

The scenario described in the question suggests a change from a liquid state to a solid state, known as solidification or freezing. When a liquid is cooled, the energy of the molecules decreases and they begin to move more slowly.

As the temperature approaches the freezing point, the attractive forces between the molecules begin to overcome their thermal energy, causing the molecules to arrange themselves in a more organized and compact structure. Eventually, the molecules become locked in place, forming a solid.

The degree to which a liquid can be supercooled before solidifying depends on factors such as the specific properties of the liquid, the rate of cooling, and the presence of impurities.

In some cases, supercooling can occur where a liquid is cooled below its normal freezing point without solidifying. However, even in these cases, the liquid will eventually solidify if it is disturbed or seeded with a small crystal of the solid phase.

Therefore, Solidification is an important process in many industries, such as metalworking and manufacturing of plastics and ceramics. Understanding the factors that influence solidification can help improve the quality and properties of these materials.

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Answer:

easy

Explanation:

Divide the mass by the volume to calculate its density. If its density isn't the same as an equal amount of pure silver, the coin has some other metal in it.

Answer:

1105.7kg of limestone must be added

Explanation:

A solution is neutralized when pH = 7.0. That is [H+] = 1x10⁻⁷M.

The initial [H+] is 10^-5.3 = 5.01x10⁻⁶M.

That means we need to neutralize:

5.01x10⁻⁶M - 1x10⁻⁷M = 4.91x10⁻⁶M

The moles of H+ in 4.5 billion liters = 4.5x10⁹L are:

4.91x10⁻⁶M * (4.5x10⁹L) = 22095 moles of H+

That reacts with limestone (CaCO3), as follows:

2H+ + CaCO3 → H2O + CO2 + Ca²⁺

Moles of limestone needed to neutralize the lake are:

22095 moles of H⁺ * (1 mole Limestone / 2 moles H⁺) = 11047.5 moles of limestone.

Molar mass of limestone is 100.09g/mol. Mass of limestone we need to add are:

11047.5 moles of limestone * (100.09g / mol) = 1.106x10⁶g of limestone. In kg:

1.106x10⁶g of limestone * (1kg / 1000g) =

1105.7kg of limestone must be added

Answer: 1.79 x 10^24 molecules H2O

Explanation:

Use the following conversion factors to convert from molecules of oxygen to molecules of water: 1 mole O2/ 6.02 x 10^23 molecules O2, 2 mole H2O/ 1 mole O2, 6.02 x 10^23 molecules H2O/ 1 moles H2O

Answer: The answer is C. 0.1MCaCl2

Explanation:

We have AgCl whose least solubility is to be determined at 25degree Celsius

so upon looking at the options given we observe C 0.1MCaCl2 and D 0.1MHCl both have chlorine ions present and we know that here common ion effect will happen that causes decreases the solubility of the AgCl here

but when Calcium chloride dissociates it gives 2 moles of chlorine ions

[tex]CaCl2[/tex]→[tex]Ca^+2 + 2Cl^-[/tex]

so chlorine ion will be present in more amount [tex]2*0.1\\[/tex]=[tex]0.2[/tex] as compared to the chlorine produced by HCl

[tex]HCl[/tex]→[tex]H^+ +Cl^-[/tex] only 1 mole of chlorine is produced.

Hence AgCl will be least soluble in 0.1M CaCl2