the amount of hydrogen that would be produced by dropping 2.5 grams of zinc in 100 mL of sulfuric acid solution with the same concentration

The atomic mass of the element X is 56 and the element can be seen to be iron.

In this problem, we are given a compound to obtain the identity of the unknown element therein.

We already can relate that;

Number of moles = mass/molar mass

Number of moles Br  = 0.04806 moles

Molar mass of Br could be obtained as 79.9 g/mol

We have;

Mass = Number of moles x molar mass

         = 0.04806x 79.9

       = 3.84 g

Mass of X = 4.735 - 3.84

                 = 0.895 g

Given that there are 3 moles of Br for every 1 mole of X. We have 0.04806 mole of Br present in 4.735 g, then the number of moles of X present would be:

                              0.04806/3 = 0.01602 moles

Molar mass = mass/mole

                     = 0.895/0.01602

                          = 55.87 or 56 g/mol

Hence, the element X is iron

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Considering the definition of molar mass, the number of moles of Ti and Fe₂O₃ are 0.087 moles and 0.11 moles respectively.

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

The molar mass of a compound is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

The molar mass of Ti is 204.37 g/mole.

You know the molar mass of the elements is:

So, the molar mass of the compound Fe₂O₃ is calculated as:

Fe₂O₃= 2× 55.85 g/mole + 3× 16 g/mole

Solving:

Fe₂O₃= 159.7 g/mole

You can apply the following rules of three:

moles of Ti= (17.8 grams× 1 mole)÷ 204.37 grams

moles of Ti= 0.087 moles

If by definition of molar mass 159.7 grams of Fe₂O₃ are contained in 1 mole, 17.8 grams of Fe₂O₃ are contained in how many moles of Fe₂O₃?

moles of Fe₂O₃= (17.8 grams× 1 mole)÷ 159.7 grams

moles of Fe₂O₃= 0.11 moles

Finally, the number of moles of Ti and Fe₂O₃ are 0.087 moles and 0.11 moles respectively.

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If ln(x) = 3.11, the value of x is 22.64. it has 4 significant figures.

In positional notation, significant figures are the digits in a number that is trustworthy and required to denote the amount of something. The correctness and precision of numbers are the focus of significant figures, also known as significant digits, which are crucial components of scientific and mathematical calculations.

significant figures play a crucial role when estimating the degree of uncertainty in the outcome. The number of digits that can be determined with some degree of certainty is relevant to significant figures. When compiling data from an experiment, keeping track of this number is crucial because it reduces mistakes.

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Density of X = 0.5 g/cm³

Volume of Y = 5 cm³

Mass of Z = 20 g

As we know Density is the substance's mass per unit of volume. So according to the given values of X,Y and Z we can calculate density, mass and Volume.

For X:

Volume of X = 10g

Mass of X = 50cm³

Density =Mass ÷ Volume

Density = 10 /50

Density = 0.5 g/cm³

For Y  

Mass of Y = 50g

Density of Y = 10g/cm³

Volume = Mass / Density

Volume = 50 / 10

Volume = 5 cm³

For Z:

Volume of Z = 5 cm³

Density of Z =4 g/cm³

Mass of  Z = Volume ×Density

Mass of Z = 4×5

Mass of Z = 20g

Complete question is

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The density is quantitative method to measure the mass and volume of a substance.

The formulae of density is mass of a substance per unit volume.

1) For X

The mass of X  =  10.0gm

The volume of X = 20.0 cm³

Then density of X = mass/ volume

Density of X         = 20/10

Density of X       = 2 g/ cm³

2) For Y

The mass of Y = 50gm

density of Y = 10 gm/cm³

volume  of Y = mass /density

Volume of Y = 50/10

Volume of Y = 5cm³

3) For Z

The volume of Z = 5 cm³

The density of Z =  4 gm/cm³

The mass of Z =  density ×volume

The mass of Z = 5× 4

The mass of Z = 20 gm

The density of X =  2 g/ cm³

The Volume of Y =  5cm³

The Mass of Z = 20 gm

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Answer:

Let it be x

[tex]{ \tt{ (oxidation \: state \: of \: nitrogen) + 2x = overall \: charge}} \\ { \tt{ - 4 - 2 x = 0}} \\ { \tt{2x = - 4}} \\ { \tt{x = - 2}}[/tex]

The number of atoms of gold in the 2.96 mL of the seawater is 4.73×10¹⁰ atoms

1 mole of Gold = 6.02×10²³ atoms

With the above information, we can determine the number of atoms in the seawater. Details below

1 mole of Gold = 6.02×10²³ atoms

Therefore,

7.86×10⁻¹⁴ mole of gold = (7.86×10⁻¹⁴ mole × 6.02×10²³ atoms) / 1 mole

7.86×10⁻¹⁴ mole of gold = 4.73×10¹⁰ atoms

Thus, 4.73×10¹⁰ atoms of gold are present in the seawater

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Answer:

Your mom

Explanation:

Julie I think that this is the most easiest  question someone has every asked in my whole entire life. I think you should really go to a lower class and will benefit you more. I wish you some what of some success!!!!

Mass of the object is 5.6196 * 10^4 g.

The term density has to do with the ratio of the mass to the volume of a substance. The density is an intrinsic property of a substance which could be used to identify a substance.

Mass of the substances = ?

Volume of the substance = 20. cm x 20.0 cm x 70.0 cm =28000 cm^3

Density of the substance = 2.007 g/cm3

Density = mass/volume

mass = density * volume

mass = 2.007 g/cm3  * 28000 cm^3

mass = 5.6196 * 10^4 g

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Answer:

1.03 x 10²³ atoms NaCl

Explanation:

To find the amount of table salt (NaCl) in atoms, you need to (1) convert grams to moles (using the molar mass) and then (2) convert moles to atoms (using Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units.

(Step 1)

Molar Mass (NaCl): 22.99 g/mol + 35.45 g/mol

Molar Mass (NaCl): 58.44 g/mol

10 grams NaCl                1 mole
------------------------  x  -----------------------  =  0.17 moles NaCl
                                   58.44 grams

(Step 2)

Avogadro's Number:

6.022 x 10²³ atoms = 1 mole

0.17 moles NaCl           6.022 x 10²³ atoms
--------------------------  x  --------------------------------  =  1.03 x 10²³ atoms NaCl
                                                 1 mole

Answer:

36 L

Explanation:

Since the temperature remains constant, you can use Boyle's Law to find the final volume:

P₁V₁ = P₂V₂

In this formula, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and volume. Before, you can plug the given values into the equation and solve for "V₂", you need to convert mmHg to atm to maintain consistent units.

760 mmHg = 1 atm

P₁ = 3,450 mmHg / 760 mmHg = 4.54 atm      P₂ = 1.4 atm

V₁ = 11.2 L                                                            V₂ = ? L

P₁V₁ = P₂V₂                                                  <----- Boyle's Law

(4.54 atm)(11.2 L) = (1.4 atm)V₂                    <----- Insert values

50.848 = (1.4 atm)V₂                                   <----- Multiply 4.54 and 11.2

36 = V₂                                                        <----- Divide both sides by 1.4

The mass (in grams) of xenon in 3.541 g of the compound xenon tetrafluoride is 2.243 grams

We'll begin by listing the composition of xenon tetrafluoride, XeF₄

1 mole of XeF₄ contains the following:

The mass of Xe in 3.541 g of XeF₄ can be obtained as illustrated below:

207.3 g of XeF₄ contains 131.3 g of Xe.

Therefore,

3.541 g of XeF₄ will contain = (3.541 g × 131.3 g) / 207.3 g = 2.243 g of Xe

Thus, 2.243 g of Xe is present in 3.541 g of xenon tetrafluoride, XeF₄

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As a nucleus becomes unstable, it will undergo radioactive decay to form the daughter nuclei because daughter nuclei is more stable and lighter than the nucleus that decayed.

Radioactive decay is the process in which the emission of energy is in the form of ionizing radiation.

It is represented as

A = - (dN/dt)

where,

A = total activity

t = time

N = number of particles

Daughter nucleus is the nucleus which remains after the decay. Daughter nucleus form when the 2 nucleus usually by mitosis results from the division of a single nucleus.

Thus from the above conclusion we can say that As a nucleus becomes unstable, it will undergo radioactive decay to form the daughter nucleus.

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Hexane, CH3CH2CH2CH2CH2CH3, has a boiling point of 69ºC, while butane has a boiling point of 0.4ºC. Both molecules are nonpolar. Describe the significant difference between these two substances' boiling points.

Intermolecular attractions are the likely cause of the significant disparity in the boiling points of butane and hexane. Due to its size (molecular weight = 86) and higher number of electrons and nuclei, hexane has stronger and more durable van der Waals forces. With a molecular weight of 58, butane is a smaller molecule with less van der Waals forces.

Hexane has a higher boiling point than butane as a result, while butane has a lower boiling point.

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The mass of a sample of copper with a volume of 4.5 cubic centimeters is 40.32 grams.

A substance's density is defined as its mass per unit of volume. Density is most frequently represented by the symbol, however Latin letter D may also be used. Mass divided by volume is the formula for density in mathematics: ρ = m / v , where ρ is the density, m is the mass, and V is the volume.

So, ρ = m/v

8.96 = m / 4.5

40.32 g = mass

Therefore, the mass of a sample of copper with a volume of 4.5 cubic centimeters is 40.32 grams.

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Answer:

it is 3 in a half inches long i hope this helped

We will immediately say that right here idea or idea or precept from the from the herbal sciences college students, herbal sciences- that could be a relevant that is real occasion to snow's paintings on Anaesthetics. the scholars is thereto substances.

Propofol, etomidate, and ketamine are the intravenous sedative-hypnotic retailers typically used to result in standard anesthesia, at the same time as adjuvant dealers, eg, opioids, lidocaine, midazolam are frequently used to complement the effects of the primary sedative-hypnotic induction agent.

Examples consist of an epidural to ease the pain of childbirth or at some stage in a cesarean phase, a spinal for hip or knee surgical procedure, or an arm block for hand surgical treatment. preferred anesthesia: This remedy makes you subconscious and insensitive to ache or other stimuli.

Propofol is the maximum usually used IV fashionable anesthetic. In lower doses, it induces sleep whilst allowing a affected person to maintain respiration on their personal. It's far regularly utilized by anesthesiologist for sedation similarly to anxiolytics and analgesics.

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The net force of the runner, given the data from the question is 280 N

From the question given above, the following data were obtained:

The net force of the runner can be obtained as illustrated below:

Net force = Exerting force - resistance force

Net force = 325 - 45

Net force = 280 N

From the calculation made above, we can conclude that the runner's net force is 280 N

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The net force of the runner would be 280 N.

Hope this helps! Also, if you need help with the other questions regarding this assignment, feel free to check out the study set I made on Quizlet. Thanks and good luck!

Quizlet - "Unit 6: Lesson 2 Newton's First Law QC"

h t t p s : / / q u i z l e t. c o m / 7 3 7 7 5 9 5 5 5 / u n i t - 6 - l e s s o n - 2 - n e w t o n s - f i r s t - l a w - f l a s h - c a r d s / ? n e w

The de Broglie wavelength of the neutron moving at a velocity of 7.11×10⁶ m/s is 5.56×10¯¹⁴ m

λ = h /mv

Where

The following data were obtained from the question:

The de Broglie wavelength can be obtained as follow:

λ = h /mv

λ = 6.626×10¯³⁴ / (1.676×10⁻²⁷ × 7.11×10⁶)

λ = 5.56×10¯¹⁴ m

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Molar mass is thus 70.6 g/mol.

We must first determine how many moles of gas are there in the container.

PV = nRT

where;

P - pressure = 290 802.75 Pa = 2.87 atm x 101 325 Pa/atm

Volume: 5.29 x 103 m3, or V.

quantity of moles, n

R, the global gas constant, is 8.314 Jmol K-1.

Temperature is 230 K, or T.

using these values as a substitute in the equation

n x 8.314 Jmol 1 K x 230 K = 290 802.75 Pa x 5.29 x 10 3 m3

n = 0.804 mol

the molar mass = [tex]\frac{mass present}{number of moles}[/tex]

the molar mass of gas =[tex]\frac{56.75g}{0.804 mol}[/tex]

therefore molar mass is 70.6 g/mol

Molar mass is 70.6 g/mol as a result.

The molar mass of a chemical compound is defined as the mass of the sample divided by the amount, or the number of moles, in the sample, measured in moles. A substance's molar mass is a bulk characteristic rather than a molecular one.

The phrases "molecular mass" and "formula mass," which refer to molar mass specifically for molecular compounds, are commonly used interchangeably; nevertheless, the definitions provided by the most trustworthy authorities vary.

The molar mass is the appropriate unit for converting between a substance's mass and quantity in bulk quantities.

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Answer:

Based on the mass number of an element, one can determine the number of neutrons that element has. The identity of an element implies its number of protons, and thus one can subtract atomic number from mass number to determine the number of neutrons in the atom's nucleus.

The following equality statistic is available for the BC X (s) region states:

The following data is obtained using the equilibrium diagram:

shows the various categories that can be found in various temperatures and shapes.

It demonstrates how one object can solidly melt over another.

Describes the amount of the temperature at which the material system solidifies or solidifies.

The rate of reaction is equal to the rate of reaction in an equilibrium situation.

Examples of equilibrium include a book on the table, liquid in a tightly sealed container, full solution, ionic compounds in polar solvents, and the synthesis of ammonia.

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Answer:

since neon has 10 electrons, phosphorous would contain 10 + 2 + 3 = 15 electrons, with 5 being valence electrons.

aka 15 dots in total, with 5 dots in the valence electron shell

Therefore if a patient receives a dose with an activity of 53. 8 mCi of technetium-99m for cardiac imaging, radioactivity will be left in the patient’s body 72 hours after injection is 0.00024

The equation that describes the radioactive decay is:

Ln [A] = -kt + Ln [A]₀

Where [A] could be taken as activity of the source after time t, [A]₀ is initial activity and k is decay constant.

Decay constant could be written as:

k = ln2 / Half-life

k = ln 2 / 6h

k = 0.115h⁻¹

Replacing in decay equation:

ln a = -0.115 x 72  + Ln [53.8]

ln a = - 8.28 + 3. 98

ln a = - 8.28

log a = -4/ 2.303

log a = 1.867

Therefore if a patient receives a dose with an activity of 53. 8 mCi of technetium-99m for cardiac imaging. radioactivity will be left in the patient’s body 72 hours after injection is 1.867

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The secondary cell wall of the elongated, hollow xylem cells, which are dead, contains lignin.

The specialized tissue in vascular plants called xylem distributes nutrients and water from the plant-soil contact to the stems and leaves as well as serving as a mechanical support system and a storage system. One of the key characteristics that sets vascular plants apart is the xylem's ability to transmit water.

Vascular bundles, which are found in both non-woody plants and non-woody sections of woody plants, contain xylem. In woody plants, a meristem known as the vascular cambium lays down secondary xylem. as a component in a starry arrangement rather than a bundle, as in many ferns.

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Answer:

nnnj

Explanation:

James Author I m not sure if you have any questions or concerns please visit the plug-in settings to determine how attachments are handled the situation and see if you have yyyy I m not sure if you have any questions or concerns please visit the plug-in settings to determine how attachments are handled the situation and I m not sure if you have any questions or concerns please visit the plug-in I m not gonna lie in bed with step by step by step instructions on how we can get the answer to your account we will tell you have any questions you might want I will be able and you will send the hw the whole thing is the whole thing I have to the whole of I m too many like a good for the plug-in the plug-in I m eating a good for the whole time I was just for you the whole of the et I m eating a email to the answer to the answer to the same is the answer is er the whole time is the best ee the whole of I will send me a good time for the plug-in the whole thing was I is not to mention the plug-in I am a email I will be able to the answer is no sharing to others and you can get the

Answer:

B. Skimming

Explanation:

Skimming is an electronic method of stealing a victim's credit card number and then using the information to make fraudulent purchases.

The acceleration of the turtle, given the data from the question is 0.4 m/s²

This is defined as the rate of change of velocity which time. It is expressed as

a = (v – u) / t

Where

The acceleration of the turtle can be obtained as follow:

a = (v – u) / t

a = (5 – 1) / 10

a = 4 / 10

a = 0.4 m/s²

Thus, acceleration of the turtle is 0.4 m/s²

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The compound is-

CH₂-CH3 = C2H5 = it is ethyl radical

CH3-CH₂-CH-CH-CH₂-CH3= Hex-3-ene

-CH-CH- = acetylene or ethyne

CH₂-CH3 = ethyl radical

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