What is the % of water in (MgSO4 . 2H2O)?

it takes approximately 38.04 years for 16.0 ng of tritium to decay to the point where 2.0 ng remains. The half-life of tritium is 12 years, which means that after 12 years, half of the original amount of tritium will decay. To find out how long it takes for 16.0 ng of tritium to decay to 2.0 ng, we can use the concept of half-life.


Calculate the number of half-lives needed to decay from 16.0 ng to 2.0 ng. First, find the difference in the number of ng: 16.0 ng - 2.0 ng = 14.0 ng. Next, divide this difference by the original amount: 14.0 ng / 16.0 ng = 0.875. This means that 0.875 or 87.5% of the original tritium has decayed. Since each half-life represents a decay of 50%, we need to find the number of half-lives it takes to reach 87.5%.

Calculate the number of half-lives We can use the formula N = (log(final amount) - log(initial amount)) / log(0.5), where N is the number of half-lives. Plugging in the values, we have N = (log(0.875) - log(1)) / log(0.5 Using a calculator, we find N ≈ 3.17.

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To prevent more than one sperm from entering the egg.

What is oocyte?

An oocyte , or ovocyte is a female gametocyte or germ cell involved in reproduction. In other words, it is an immature ovum, or egg cell. An oocyte is produced in a female fetus in the ovary during female gametogenesis. The female germ cells produce a primordial germ cell (PGC), which then undergoes mitosis, forming oogonia. During oogenesis, the oogonia become primary oocytes. An oocyte is a form of genetic material that can be collected for cryoconservation.

When the sperm and egg fuse it triggers a release of calcium ions, which cause the cortical granules inside the egg to fuse with the plasma membrane. As they fuse, these granules release their contents outside of the cell, toward the remains of the zona pellucida.

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Answer:

The Noble Gases have eight valence electrons, which fill their outer energy level. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.

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Answer:

(CH₃COO)₂Ca(aq) + Na₂CO₃(aq) = 2CH₃COONa(aq) + CaCO₃(s)

2CH₃COO⁻ + Ca²⁺ + 2Na⁺ + CO₃²⁻ = 2CH₃COO⁻ + 2Na⁺ + CaCO₃

Ca²⁺ + CO₃²⁻ = CaCO₃

Answer:

A. Enzymes

Explanation:

Enzymes are in our saliva and tears. They help break down pathogens and the cell wall of bacteria.

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Muffin~

Answer:

A. Enzymes.

Explanation:

Enzymes break down things and they are in both our saliva and tears.

I hope it helps! Have a great day!

.-.

The number of moles of Benzyl alcohol is 0.115 moles.

Number of moles can be also told in terms of Avogadro's number with is 6.023 × \(10^{23}\). It can be calculated for atoms, molecules, ions or others as well. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance. The concept of the mole helps to put quantitative information about what happens in a chemical equation on a macroscopic level. So it is used widely.

Molecular mass is nothing but the sum of atomic mass of all the element present in the molecule. In the above given question we have to calculate the number of moles of the molecule by using the given weight. To do so we use the below formula;

Number of moles = given weight

                               Molecular mass

⇒ 12.50  = 0.115 moles

   108.14

Therefore the number of moles in 12.50 g of benzene C2H5OH is 0.115 moles

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The antidepressant sertraline can be prepared in six steps with yields of 80.%, 80.%, 50.%, 100.%, 48% and 30.%, respectively. If you started with 1.0 mol of starting material prior to the first step and each step had a 1:1 stoichiometry of reactant to product, the answer is 0.046 moles (approx).

The yields for the six steps are 80.%, 80.%, 50.%, 100.%, 48% and 30%. The number of moles produced at each step can be calculated as follows:

1st step yield = 80% of 1.0 mol = 0.8 mol

2nd step yield = 80% of 0.8 mol = 0.64 mol

3rd step yield = 50% of 0.64 mol = 0.32 mol

4th step yield = 100% of 0.32 mol = 0.32 mol

5th step yield = 48% of 0.32 mol = 0.1536 mol

6th step yield = 30% of 0.1536 mol = 0.04608 mol

So, the number of moles of sertraline produced is approximately 0.046 (mol).

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The first two Bash environment files that are executed are /etc/profile and the user-specific startup file, such as ~/.bash_profile, ~/.bash_login, or ~/.profile.

The two files that are usually executed when a Bash shell is started are:

/etc/profile - This file contains system-wide environment variables and startup programs that are used by all users who log in to the system. It is executed once for every login shell.

~/.bash_profile or ~/.bash_login or ~/.profile (in that order of preference) - These files contain environment variables and startup programs that are specific to a particular user. They are executed once for every login shell of the user.

Note that these files are executed only for login shells. For non-login shells, Bash reads the ~/.bashrc file instead.

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Answer : The correct option is, electron.

Explanation :

As we know that,

An atom is the smallest unit of a matter that consist of three subatomic particles which are electrons, protons and neutrons.

The protons and the neutrons are located inside the nucleus or the center of the nucleus where the mass of the an atom is concentrated.

The electrons are located around the nucleus.

The protons are positively charged, the electrons are negatively charged and the neutrons are neutral that means it has no charge.

According to the question, the electron subatomic particle found revolving around the nucleus.

Hence, the correct option is electron.

Approximately 18.4832 mL of 0.250 M NaOH is required to neutralize 30.4 mL of 0.152 M HCl.

To determine the volume of 0.250 M NaOH required to neutralize 30.4 mL of 0.152 M HCl, we can use the concept of stoichiometry and the balanced chemical equation for the neutralization reaction between NaOH and HCl:

NaOH + HCl -> NaCl + H2O

From the balanced equation, we can see that the stoichiometric ratio between NaOH and HCl is 1:1. This means that for every mole of NaOH, we require an equal number of moles of HCl to neutralize.

First, let's calculate the number of moles of HCl present in the given volume:

Moles of HCl = concentration of HCl * volume of HCl

= 0.152 M * 30.4 mL

= 4.6208 mmol (millimoles)

Since the stoichiometric ratio is 1:1, the number of moles of NaOH required to neutralize the HCl is also 4.6208 mmol.

Now, let's calculate the volume of 0.250 M NaOH needed to contain 4.6208 mmol:

Volume of NaOH = (moles of NaOH) / (concentration of NaOH)

= 4.6208 mmol / 0.250 M

= 18.4832 mL

Therefore, approximately 18.4832 mL of 0.250 M NaOH is required to neutralize 30.4 mL of 0.152 M HCl.

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Answer:

\(3.2\times 10^{-18}\ C\)

Explanation:

No of electrons, n = 20

We need to find the total charge. We can use quantization of electric charge in this case.

Net charge,

q = ne

e is charge on an electron

\(q=20\times 1.6\times 10^{-19}\\\\q=3.2\times 10^{-18}\ C\)

So, there are \(3.2\times 10^{-18}\ C\) of charge in 20 electrons.

The number of moles in 5.12 × 10³ Fluorine(F) atoms is 8.45 × 10 ‐ ²³ moles.

The moles is defined as the measurement of the amount of any substance. Its is the measure of the amount of elementary particles in a substance. One mole is numerically equal to 6.023 × 10²³  which is called Avogadro's number.

From Periodic Table, we can find that Molecular Weight of Fluorine(F) is 19. We know the Molar Weight of any element is numerically equal to its Molecular Weight i.e. numerically, Molecular Weight = Molar Weight of any matter.

The number of moles in 5.12 × 10³ Fluorine(F) atoms will be calculated as: (5.12 × 10³) / (6.023 × 10²³) = 8.45 × 10 ‐ ²³ moles

So, there are approximately 8.45 x 10^-23 moles  in 5.12 × 10³ atoms of Fluorine.

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Answer:

1.66mol/L remain

Explanation:

Based on the reaction:

2 SO2(g) + O2(g) ⇄ 2 SO3(g) ∆H = −197.8 kJ

2 moles of SO2 react per mole of oxygen. To find the concentration of SO2 we need to see the moles of SO2 that react to find thus moles of oxygen that react and the moles and concentration of O2 that remains in the equilibrium:

Moles SO2 that remain:

1.32mol /L = 1.32moles of SO2 remains

2.60 initial moles - 1.32moles that remains = 1.28 moles of SO2 react

Moles O2 that reacted:

1.28 moles SO2  * (1mol O2 / 2mol SO2) = 0.64 moles O2

Moles O2 that remain:

2.30 moles O2 - 0.64 moles = 1.66 moles remain

And concentration is:

1.66moles / 1L =

50 g of water required 80 calories to raise its temperature from 20°C to 50°C.

The amount of heat required to raise the temperature of a substance is given by the formula: q = mcΔT, where q is the heat energy, m is the mass of the substance, c is its specific heat capacity, and ΔT is the change in temperature.

The specific heat capacity of water is approximately 4.18 J/g°C, which means that it takes 4.18 joules of heat energy to raise the temperature of 1 gram of water by 1°C.

Using this formula, we can calculate the amount of heat required to raise the temperature of 50 g of water from 20°C to 50°C:

q = (50 g) * (4.18 J/g°C) * (50°C - 20°C)

= 50 * 4.18 * 30

= 80 calories

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Yes, the process of assembling large molecules from simple ones in a living cell is consistent with the second law of thermodynamics.

While the second law of thermodynamics states that entropy, or disorder, tends to increase in a closed system, living cells are not closed systems. They constantly exchange energy and matter with their environment, allowing them to create order and complexity within themselves. In fact, living organisms are able to maintain their internal order and complexity precisely because they are able to continually take in energy and matter from their surroundings and use it to drive the assembly of large molecules and other complex structures. Therefore, the process of assembling large molecules from simple ones in a living cell is consistent with the principles of thermodynamics, as long as the cell is able to maintain a consistent flow of energy and matter to support these processes.
Yes, in a living cell, the process of assembling large molecules from simple ones is consistent with the second law of thermodynamics. The second law states that the entropy, or disorder, of an isolated system will always increase over time. Living cells maintain a low level of entropy by utilizing energy (such as from food or sunlight) to drive the formation of complex molecules, thus maintaining order within the cell. This energy input compensates for the increase in entropy and ensures the cell's processes are in accordance with the second law of thermodynamics.

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Answer:

We are all made out of atoms, yes this is true. And atoms never touch each other. So no sir, i did not punch that little boy.

Explanation:

Answer:

Aluminum isn't found pure naturally, but its found mixed with other minerals in the earth. It's used to make cans, foil, kitchen utensils, window frames and even deodorant

Explanation:

Answer:

People used technology to make the I phone.

Explanation:

The mass of solid aluminum produced at the cathode is approximately 7.43 grams after six hours.

Using Faraday's equation:

moles of substance = (electric charge passed) / (Faraday's constant x number of electrons transferred)

In this case, the substance being produced is aluminum, Al, and the number of electrons transferred is 3, since Al3+ ions each gain 3 electrons to form Al atoms.

The electric charge passed can be calculated from the current and time using the equation:

electric charge = current x time

                         = 3.7 A x 6 hours x 3600 seconds/hour = 80,064 C

The Faraday constant is the charge on one mole of electrons, which is 96,485 C/mol. So we can calculate the moles of aluminum produced as:

Moles of Al = 80,064 / (96,485 x 3) = 0.276 mol

Mass of Al = 0.276 mol x 26.98 g/mol = 7.43 g

Therefore, the mass of solid aluminum produced at the cathode is approximately 7.43 grams after six hours.

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The molar mass of NaOH is 40g, so 0.5mol is 20g

The molar mass of Na is 23g, O is 16g and H is 1g (total 40g), so in this case we have

Na 11.5g, O 8g and H 0.5g (total 20g)

The mole is represented by Avogadro's number, which is 6.022 × 1023 atoms or molecules per mol.

Answer: Reflectors use a mirror to collect the light, whilst refractors use a lens while, Refractor telescopes require a large lens at the front to direct the incoming light to the lens.

Answer:

Ice: solid and rigid. Water: Liquid and sloshy Gas: light and not dense.

Explanation:

Up ^

Answer:

c.) pure substances reacting

Answer:

the steak I ate because its protein

Explanation:

Given:

The complete equation is:

The balanced ionic equation for the reaction is:

The BaSO₄ is an insoluble solid, so it will not dissociate into ions.

The spectator ions in the reaction are ions that are present at both the reactant side and the product side.

Hence, the spectator ions are:

Therefore, the balanced net ionic equation is:

Answer:

The pH scale measures acidity of a substance. known as potential of hydrogen, it varies from 0 to 14 with 7 being the pH value of a neutral solution. Below 7 shows the substance is acidic in nature and above 7 is alkaline in nature. pH 0-3 are considered strong acids while pH 4-6 are weak acids. pH 8-10 are weak alkalines and pH 11-14 are strong alkalines. This is a general trend and there may be exeptions especially if the substance has a negative pH. However, it would not be covered likely unless you are doing university chemistry.

Answer:

A.  -10,000

Explanation:

When x approaches zero, the graph tells us that F(x) either becomes extremely large or extremely small.  The best answer is therefore A:  -10,000.  Best, because we aren't given the exact value of x, but clearly the other results require that x be greater than 1 or less than -1, which is far from zero.

Answer:

\(\huge\boxed{\sf Atom}\)

Explanation:

Atom:

Element:

\(\rule[225]{225}{2}\)

With 35.0 mL of a 0.1 M HCl solution neutralizing 25.0 mL of the NaOH solution, we find that the moles of NaOH are equal to the moles of HCl. Using this information, we calculate the molarity of NaOH to be 0.14 M.

To determine the concentration of the NaOH solution, we can use the concept of stoichiometry and the volume and concentration of the HCl solution used in the neutralization reaction. The balanced chemical equation for the reaction between HCl and NaOH is:

HCl + NaOH → NaCl + \(H_{2} O\)

From the equation, we can see that the mole ratio between HCl and NaOH is 1:1. This means that the number of moles of HCl used in the reaction is equal to the number of moles of NaOH present in the solution.

Given that it takes 35.0 mL of a 0.1 M HCl solution to neutralize 25.0 mL of the NaOH solution, we can use the equation:

Moles of HCl = Molarity of HCl × Volume of HCl solution

Moles of NaOH = Moles of HCl

Molarity of NaOH = Moles of NaOH / Volume of NaOH solution

Substituting the given values:

Moles of HCl = 0.1 M × 35.0 mL = 3.5 mmol

Moles of NaOH = 3.5 mmol

Volume of NaOH solution = 25.0 mL = 0.025 L

Molarity of NaOH = (3.5 mmol) / (0.025 L) = 140.0 mmol/L = 0.14 M

Therefore, the concentration of the NaOH solution is 0.14 M.

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