What is the product of the first beta decay in this series?
A)
AC-227
B)
Ac 228
Ra-227
D
Rn 224

The volume of the gas at STP would be 23.93 liters.

The volume of gas at STP (Standard Temperature and Pressure), we need to use the Ideal Gas Law, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is temperature. First, we need to calculate the number of moles of gas in the initial sample. We can use the formula n = PV/RT, where P is the initial pressure, V is the initial volume, R is the gas constant, and T is the initial temperature.
n = (2.31 atm) x (25.15 L) / [(0.0821 L atm/mol K) x (201 + 273.15 K)]
n = 1.067 moles

Now, we can use the molar volume of gas at STP, which is 22.4 L/mol, to calculate the volume of gas at STP.
V = n x 22.4 L/mol
V = 1.067 moles x 22.4 L/mol
V = 23.93 L
Therefore, the volume of the gas at STP would be 23.93 liters.

For more such questions on gas

https://brainly.com/question/25736513

#SPJ11

The Br are in 25 g CaBr2 will be approximately 203.87 g of Br.

The molar mass of an element's atoms is calculated by multiplying the element's comparative atomic mass by the molar mass constant.

In the given scenario, we need to find the grams of Br in CaBr2.

We know that,

molar mass of Br = 79.904 g/mol

molar mass of CaBr2 = 199.886 g/mol

CaBr2 = 2 Br + Ca

So, by the given data,

199.886 g = 2 x 79.904 g

255 g = X ( i.e., mass of Br )

X = 255 x 2 x 79.904 / 199.886

X = 203.87 g of Br

Thus, the amount of Br is 203.87gm.

For more details regarding molar mass, visit:

https://brainly.com/question/12127540

#SPJ1

Answer:

Physical properties can be observed or measured without changing the composition of matter. Physical properties are used to observe and describe matter. Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others.

The mass percent composition of each constituent element of lead (II) phosphate is:
Pb = 76.58%
P = 7.63%
O = 15.79%

To calculate the mass percent composition of each constituent element of lead (II) phosphate, we need to first find the molar mass of each element in the compound and then divide each by the total molar mass of the compound.The chemical formula for lead (II) phosphate is Pb3(PO4)2.

The molar mass of each element in the compound is:
Pb = 207.2 g/mol
P = 30.97 g/mol
O = 16.00 g/mol

The total molar mass of the compound is:
Pb3(PO4)2 = (3 × 207.2) + (2 × 30.97) + (8 × 16.00) = 811.34 g/mol

The mass percent composition of each element is:
Pb = (3 × 207.2) / 811.34 × 100 = 76.58%
P = (2 × 30.97) / 811.34 × 100 = 7.63%
O = (8 × 16.00) / 811.34 × 100 = 15.79%

More questions on mass percent can be obtained here: https://brainly.com/question/23896069

#SPJ11

The percent by mass of sulfur is  20.1%.

Here, we need to find the percent by mass of the sulfur atom and we have to do that by first obtaining the molar mass of the compound as we can see it from the question.

Hence;

Molar mass of the compound = 63.55 + 32.07 + 4( 16.00 )

=  63.55 + 32.07 + 64

= 159.62

We now have to find the percent by mas of sulfur;

32.07/159.62  * 100

= 20.1%

The compound contains 20.1% of sulfur by mass of the compound as shown in the calculation.

Learn more about percent by mass:https://brainly.com/question/5394922

#SPJ1

Answer:

The food coloring in the hot water will most likely spread faster than the one in the cold in which can result in it turning green rather than the coloring in the cold.

Explanation:

Answer:

approximately 251.55 grams of AuCl3 would contain 5.0 x 10^23 molecules.

From the calculations, the change in energy is - 190 J.

From the first law of thermodynamics, the energy is neither created nor destroyed but is transformed from one form to another.

From the law;

U = q + w

U = internal energy

q = heat

w = work

Since work is done on the surroundings and the gas absorbs heat then;

U = 132 J - 322 J

U = - 190 J

Learn more about thermodynamics:https://brainly.com/question/1368306

#SPJ1

In order to determine whether there is a significant difference between two samples, the Student's t-test examines their mean and standard deviation.

A significant t-score, also known as a t-value, denotes a difference between the groups, whereas a small t-score denotes similarity. Degrees of freedom are the values in a research that have the flexibility to change, and they are crucial for determining the significance and reliability of the null hypothesis.

This test is used when specimens from two distinct populations, species, or groupings are compared and analyzed. The independent T-test is another name for it.

learn more about  t-test

https://brainly.com/question/6589776

#SPJ1

Answer:

I need to se the options

The measure of the length of events and the duration of intervals between events is time.

The duration of events or the gaps between them can be measured, compared, or even ordered using time. The lengthy period of time that the Earth's geologic history takes up is known as geologic time. Starting at the beginning of the Archean Eon  formal geologic time runs until the present. Geology is defined as the "Science of the Earth."

Geology is the fundamental Earth science that examines how the earth created, its structure and composition, and the various forces acting on it. It is sometimes known as geoscience or earth science.

Learn more about time  at;

https://brainly.com/question/479532

#SPJ1

The given electron configuration 1s² 2s² 2p⁶ 3s² 3p⁴ denotes the elements helium (He), beryllium (Be), carbon (C), magnesium (Mg), and sulfur (S).

The given electron configuration represents the electron distribution of an atom. Let's break it down and determine the elements denoted by each part:

1s²: This indicates that there are two electrons in the 1s orbital. The first electron shell (n = 1) can hold a maximum of two electrons. Therefore, the first element denoted by this configuration is helium (He).

2s²: This signifies that there are two electrons in the 2s orbital. The second electron shell (n = 2) can hold a maximum of eight electrons. The element with this configuration is beryllium (Be).

2p⁶: This indicates that there are six electrons in the 2p orbitals. The p orbitals are a set of three orbitals within the second electron shell. The element with this configuration is carbon (C).

3s²: This signifies that there are two electrons in the 3s orbital. The third electron shell (n = 3) can also hold a maximum of eight electrons. The element with this configuration is magnesium (Mg).

3p⁴: This indicates that there are four electrons in the 3p orbitals. The p orbitals in the third shell are also a set of three orbitals. The element with this configuration is sulfur (S).

Know more about the electron configuration here:
https://brainly.com/question/26084288

#SPJ8

The number of moles in 7.65×10²³ molecules of oxygen gas, O₂ is 1.27 mole

To obtain the answer to the question above, it is important that we understand the relationship between number of mole and number of molecules. This is given below:

From Avogadro's hypothesis, we understood that

6.02×10²³ molecules = 1 mole of substance.

This implies that

6.02×10²³ molecules = 1 mole of oxygen gas, O₂

With the above information, we can obtain number of moles in 7.65×10²³ molecules of oxygen gas, O₂. Details below:

6.02×10²³ molecules = 1 mole of oxygen gas, O₂

Therefore,

7.65×10²³ molecules = (7.65×10²³ × 1 mole) / 6.02×10²³

7.65×10²³ molecules = 1.27 mole of oxygen gas, O₂

Thus, we can conclude from the calculation above that the number of mole is 1.27 mole

Learn more about mole:

https://brainly.com/question/13314627

#SPJ1

The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

Learn more about heat energy:

https://brainly.com/question/31429264

#SPJ1

Answer:Comparison of Ionic and Covalent Bonds

In an ionic bond, the atoms are bound together by the electrostatic forces in the attraction between ions of opposite charge. ... For example, sodium (Na), a metal, and chloride (Cl), a nonmetal, form an ionic bond to make NaCl. In a covalent bond, the atoms bond by sharing electrons.

pls   add  Brainliest

Answer:

Explanation:

Remark

Interesting que8stion. You have to figure out how many mols are present in each reactant. Since all periodic tables are different, I'm going to use rounded numbers. If it is too close, I will go further.

NaCl

Na = 23

Cl = 35.5

1 mol = 58.5 grams

given = 50.0 grams

Mols for the reaction = 50/58.5 = 0.855

H2SO4

H2       =    2*1        2

S          =   1 * 32   32

O4       =   4*16     64

1 mol  =               98   grams

mols  present = 50/98 = 0.510

MnO2

Mn     = 1 * 55    = 55

O2   =   2*16      = 32

1 mol =                  87 grams

mols available    = 50/87 = 0.5747

Discussion

Na Cl and H2SO4 both require 2 moles for every mol of Cl2 produces.

H2SO4  has 0.51 mols available for a reaction

NaCl has  0.855 moles available for a reaction

MnO2 has 0.575 moles available for a reaction.

Given those numbers 0.510 mols of H2SO4 will only produce 0.255 mols of chlorine and the rest will be reduced in a similar manner. H2SO4 is the limiting reagent (reactant).

In other words only 0.510 moles of NaCl will be used and 0.855 - 0.510 moles will be left over on the reactants side.

only 0.575 moles of MnO2 will be used and 0.065 moles will be left over.

The oddity in the result shows up because the balance numbers in the equation give a ratio of 2 to 1 for H2SO4 and NaCl The 2 belongs to the reactants and the 1 for the chlorine.

Answer:

The correct answer is letter A. Condensation nucleii

Buffering capacity measures a solution's capability to withstand pH fluctuations by either absorbing as well as desorbing H+ as well as OH- ions.

Aqueous buffer solutions were made up of a weak acid as well as its conjugate base or even a weak base as well as its conjugate acid. The capability of buffer solutions to keep a fairly constant pH value in reaction to the addition of a tiny amount of acid or base is an important attribute.

A buffer would be a solution that avoids pH changes when a minuscule portion of strong acid as well as strong base is added. Technical definition (How does one come up with one?): A buffer was made up of a weak acid and its conjugate base.

Thus, the correct answer will be option (b).

To know more about solution's

https://brainly.com/question/1616939

#SPJ4

Answer:

How do amoeba respire.

How do plants respire.

Answer:

40,113 years

Explanation:

To find the age of the sample, you need to use the half-life formula:

\(N(t)=N_0(\frac{1}{2})^{t/h\)

In this formula:

------> N(t) = current mass (g)

------> N₀ = initial mass (g)

------> t = time passed (yrs)

------> h = half-life (yrs)

You can plug the given values into the equation and rearrange the formula to find "t".

N(t) = 0.781 g                       t = ? yrs

N₀ = 100 g                           h = 5730 yrs

\(N(t)=N_0(\frac{1}{2})^{t/h\)                                           <----- Half-life formula

\(0.781=100(\frac{1}{2})^{t/5730}\)                                     <----- Insert values

\(0.00781=(\frac{1}{2})^{t/5730}\)                                       <----- Divide both sides by 100

\(log_{1/2}(0.00781)=log_{1/2}((\frac{1}{2})^ {t/5730})\)               <----- Take \(log_{1/2}\) of both sides

\(7.00 = \frac{t}{5730}\)                                                   <----- Solve \(log_{1/2}\)

\(40,113 = t\)                                                   <----- Multiply both sides by 5730

The given sample is 40,113 years .

Half-life, in radioactivity, is the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay.

Half-life formula,

\(\rm N(t)\;=N_0(\dfrac{1}{2})^\frac{t}{t1/2}\)   .......(1)

where,

N(t)=current mass

N₀=initial mass

t=time period

h=half -life

Given,

N(t)=0.781g, t=? yrs, N₀=100g, h=5730 years

\(\rm N(t)\;=N_0(\dfrac{1}{2})^\frac{t}{t1/2}\)

put the values, in ......(1)

0.781=100(1/2) \(t/5730\\\)

log₁/₂(0.00781)=log₁/₂ ( 1/2)\(t/5730\)

7=t/5730

40,113=t

Hence, the given sample is 40,113 years .

Learn more about half-life ,here:

https://brainly.com/question/16387602

#SPJ1

C. The pH stays about the same.

Answer:

C.The pH stays about the same.

Explanation:

Buffer reactions maintain stable pH of solutions.

The synthesis of the 3,4-dimethylhexane from 1-bromobutane occurs by the Wurtz reaction as shown.

We know that synthesis is one of the key components of organic chemistry. In the process of the synthesis of compounds, we are going to have the combination of two or more reactants so as to obtain the products that we are looking for.

In this case, we are trying to carry out the synthesis of an alkane compound. The alkane that we want to produce in this case is the compound that is known as 1-bromobutane and we are going to use  3,4-dimethylhexane to carry out the reaction.

This can be done by the use of the Wurtz reaction that is going to involves the reaction of sodium metal with an alkyl halide in dry conditions.

Learn more about Wurtz reaction:https://brainly.com/question/28330368

#SPJ1

Answer:

sand and water together in the beaker is called a mixture

We need the chemical equation first

\(\\ \tt\bull\rightarrowtail {Na\atop Sodium}+{O_2\atop Oxygen}\longrightarrow {Na_2O\atop Sodium\: oxide}\)

The ratio is 1:2

The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart. Option A)

The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart.

In gases, the molecules are widely spaced and have significant gaps between them. This allows gases to be easily compressed under pressure. When external pressure is applied to a gas, the molecules can be brought closer together, reducing the volume occupied by the gas. The gaps between the molecules provide room for compression, allowing gases to occupy a smaller volume.

In contrast, liquids and solids have molecules or particles that are closely packed together. The intermolecular forces in liquids and solids are stronger, limiting their compressibility. The molecules or particles are already in close proximity, leaving little room for further compression.

Therefore, the assumption that gases consist of molecules that are relatively far apart accounts for their greater compressibility compared to liquids and solids. Hence Option A) is correct.

For more question on molecules

https://brainly.com/question/24191825

#SPJ8

If number of bonds is three (3) then bond angle is 120° and structure is trigonal and if number of bonds is four( 4) then bond angle will be 109° 28' and structure is tetrahedral.

The angle between two bonds in a complex molecule or between two orbitals that include bonding electron pairs encircling the core atom is the bond angle. It is calculated and represented in degrees using a spectroscopic method.

When a single electron pair there at central atom begins to resist the bound pair of electrons, the bond angle decreases and the bonds are slightly shifted inward. When there is a increase in back bonding, the bond angle increases.

To know more about bond angle visit :

https://brainly.com/question/6179102

#SPJ1

Answer:

–0.360 M/s

Explanation:

Answer:

342.3 g

Explanation:

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

C = 12.011 g/mol

H = 1.00794 g/mol

O = 15.9994 g/mol

Molar mass of C₁₂H₂₂O₁₁ =?

C = 12 × 12.011 = 144.132 g

H = 22 × 1.00794 = 22.17468 g

O = 11 × 15.9994 = 175.9934 g

Total mass = 144.132 + 22.17468 + 175.9934

Total mass = 342.3 g

Answer:

Mass percent: 53.23%

Explanation:

Balancing the reaction in acidic medium:

Fe2+ → Fe3+ + 1e-

Cr₂O₇²⁻  → 2Cr³⁺

Cr₂O₇²⁻ → 2Cr³⁺ + 7H₂O  (Balancing oxygen)

Cr₂O₇²⁻  + 14H⁺ → 2Cr³⁺ + 7H₂O (Balancing protons)

Cr₂O₇²⁻  + 14H⁺ + 6e-→ 2Cr³⁺ + 7H₂O (Balancing charges)

To cancel the 6e-:

6 Fe2+ → 6 Fe3+ + 6e-

The balanced redox equation in acidic medium is:

6Fe²⁺ + Cr₂O₇²⁻ + 14H⁺ → 6Fe³⁺ + 2Cr³⁺ + 7H₂O

We need to find moles of potassium dichromate used to reach the final point in the titration. Then, using the chemical equation, we can find moles of Fe²⁺. With its molar mass (Molar mass Fe: 55.85g/mol)b we can find mass of Fe²⁺ in the iton ore and its mass percent:

Moles potassium dichromate:

28.72mL = 0.02872L * (0.05051mol / L) = 1.4506x10⁻³ moles K₂Cr₂O₇

Moles Fe²⁺:

As 6 moles of Fe²⁺ reacted per mole of K₂Cr₂O₇:

1.4506x10⁻³ moles K₂Cr₂O₇ * (6 moles Fe²⁺ / 1 mole K₂Cr₂O₇) = 8.7039x10⁻³ moles Fe²⁺

Mass Fe²⁺:

8.7039x10⁻³ moles Fe²⁺ * (55.845g / mol) = 0.4861g of Fe²⁺

Mass percent:

As the sample of iron ore weighs 0.9132g. Mass percent is:

0.4861g of Fe²⁺ / 0.9132g * 100

The mass percentage of the iron in the sample is 53.7%.

The balanced redox reaction equation is;

6Fe2+(aq) + Cr2O7^2-(aq) + 14H^+(aq)→ 6Fe3+(aq) + 2Cr3+(aq) + 7H2O(l)

The number of moles of dicromate ion is; 28.72/1000 L × 0.05051M

= 0.00145 moles

Now;

6 moles of Fe2+ reacts with 1 mole of dichromate ion

x moles of  Fe2+ reacts with 0.00145 moles of dichromate ion

x = 6 moles × 0.00145 moles/1 mole

x = 0.0087 moles

Mass of iron = 0.0087 moles × 56 = 0.49 g

Mass percent of iron = 0.49 g/0.9132 g × 100/1

= 53.7%

Learn more: https://brainly.com/question/20906233