A 25.00 mL flask contains methane (CH4) gas at 22.5°C. The pressure in the flask is 225.2 mmHg. How many moles of methane are in the flask?

I do believe the answer is A. Hope this helps.

I think A would be the correct answer

answer is one first one for one electron.

Molarity's formula is: moles solute/liters solution.

In this question, we are given grams of solute so we have to convert that to moles.

NaNO3 has a molar mass of 84.9947g/mol. Here we begin with the given 212.5g and multiplying it by 1mol/84.9947g because the grams have to cancel out to give moles.

[tex](212.5 grams NaNO3)/(\frac{1 mole NaNO3}{84.9947 grams NaNO3} ) =2.5 moles NaNO3[/tex]

Now that we have moles of solute, we just plug it into the formula.

2.5 mols NaNO3/3L solution=0.8333 M of solution

The molarity of the solution containing 212.5 g of NaNO₃ in 3 L of solution is 0.83 M

This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

Mole = mass / molar mass

Mole of NaNO₃ = 212.5 / 85

Mole of NaNO₃ = 2.5 mole

Molarity = mole / Volume

Molarity = 2.5 / 3

Molarity = 0.83 M

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Ask more questions based on learning something from this experiment.

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You didn’t list the statements.

Answer:

The answer is C. I just had this question.

Explanation:

Answer:

for table C

Explanation:

What is the concentration of H+ ions at a pH = 11?

1.  ⇒ 0.00000000001 mol/L  

What is the concentration of H+ ions at a pH = 6?

2.  ⇒ 0.000001 mol/L  

How many fewer H+ ions are there in a solution at a

pH = 11 than in a solution at a pH = 6?

3.  ⇒ 100,000

The concentration of H+ ions at pH 11 is 1.0 x 10^-11 mol/L and at pH 6 is 1.0 x 10^-6 mol/L. There are 100,000 times fewer H+ ions at a pH of 11 than at a pH of 6.

The concentration of H+ ions in a solution can be calculated using the pH value, which is the negative logarithm (base 10) of the hydrogen ion concentration. Therefore, pH = -log[H+], and to find [H+], we can use the inverse logarithmic relationship: [H+] = 10^-pH.

For a solution with a pH of 11, the concentration of H+ ions would be: [H+] = 10^-11 mol/L, which equals 1.0 x 10^-11 mol/L.

For a solution with a pH of 6, the concentration of H+ ions would be: [H+] = 10^-6 mol/L, which equals 1.0 x 10^-6 mol/L.

To find how many fewer H+ ions are in a solution with a pH of 11 compared to a pH of 6, we divide the two concentrations: (1.0 x 10^-11 mol/L) / (1.0 x 10^-6 mol/L) = 1.0 x 10^-5. This means that the solution with a pH of 11 has 100,000 times fewer H+ ions than the solution with a pH of 6.

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Answer:

2.138 I think

Explanation:

N2 + 3H2 -> 2NH3

This means that 3 moles of H2 gives 2 moles of NH3

Lets convert 12.12 g of NH3 into moles.

The molecular weight of NH3 is 17 g/mol

So 12.12 g is 0.713 moles

If 2 NH3 comes from 3 moles of H2

1 mole comes from 1.5 moles of H2

So 0.713 moles of NH3 comes from 1.5 x 0.713 moles of H2 =1.069 moles of H2

1 mole of H2 weights 2g

So 1.069 moles of H2 weighs 2.138 g

Fire is burning, which is combustion, and combustion is a type of oxidation reaction. Oxidation means combined chemically with oxygen . Oxidation is an exothermic reaction, meaning it gives releases heat energy.

for a is burning. which is combustion and that is a type of oxidation means to combine chemically with oxygen.

You can find the number of neutrons in an atom by subtracting the atomic number from the mass number.

The mass number of an atom is the total number of protons and neutrons in the nucleus of the atom. The atomic number of an atom is the number of protons in the nucleus of the atom. Both the mass number and the atomic number can be found on the periodic table of elements.

To find the number of neutrons in an atom therefore, you can use the following formula:

Number of neutrons = Mass number - Atomic number

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Final answer:

The final temperature after thermal equilibrium is reached is approximately 46.6°C.

Explanation:

To find the final temperature after thermal equilibrium is reached, we can use the principle of conservation of energy. The heat gained by the cool water is equal to the heat lost by the hot water.

Let's denote the final temperature as T. The heat gained by the cool water can be calculated using the equation q = m * c * ΔT, where q is the heat gained, m is the mass of the cool water, c is the specific heat of water, and ΔT is the change in temperature. The heat lost by the hot water can be calculated using the same equation. Setting the two equations equal to each other and solving for T will give us the final temperature.

Using the given values, we can calculate:

qcool = (200 g) * (4.18 J/g°C) * (T - 32°C)

qhot = (50 g) * (4.18 J/g°C) * (55°C - T)

Setting qcool equal to qhot:

(200 g) * (4.18 J/g°C) * (T - 32°C) = (50 g) * (4.18 J/g°C) * (55°C - T)

Simplifying and solving for T:

800(T - 32°C) = 50(55°C - T)

T = 46.6°C

Therefore, the final temperature after thermal equilibrium is reached is approximately 46.6°C.

Q=mc*temperature change

400=5.6/1000*c*(87-23)

c=1160.07J/kg/k

B solids made of atoms

Solids with the highest melting points are typically those with either covalent networks or ionic bonds, due to the strength of their atomic or ionic interactions.  So the correct option is C.

The type of solid that often has the highest melting points are those made of atoms arranged in a covalent network or those formed by ionic bonds. Solids that consist of ionic bonds, such as sodium chloride (NaCl), typically have high melting points due to the strong electrostatic interactions between the positively and negatively charged ions within a crystal lattice. Similarly, materials with a covalent network, like diamond or silicon dioxide (SiO2), have very high melting points because they consist of a three-dimensional array of covalently bonded atoms that require a lot of energy to break apart. In contrast, molecular solids composed of nonpolar or polar molecules have lower melting points due to their weaker intermolecular forces, such as London dispersion forces, dipole-dipole interactions, and in some cases, hydrogen bonding.

Answer:

The concentration of [tex]H^+[/tex] ions in the solution is [tex]1.778\times 10^{-4} M[/tex].

Explanation:

The pH of the solution is defined as negative logarithm of [tex]H^+[/tex] ion concentration.

[tex]pH=-\log[H^+][/tex]

The pH of the nitric acid solution = 3.75

[tex]3.75=-\log[H^+][/tex]

[tex][H^+]=Antilog [-3.75]=0.0001778=1.778\times 10^{-4} M[/tex]

The concentration of [tex]H^+[/tex] ions in the solution is [tex]1.778\times 10^{-4} M[/tex].

Answer:

1st Question: 1.78 / -4

2nd Question: A

Explanation:

Source: Dude trust me

Answer:

Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere. This extra carbon dioxide is lowering the ocean's pH, through a process called ocean acidification.

Significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing how land is used, and the production of concrete with limestone.

The flow of carbon on earth in its elemental and mixed phases is represented by the carbon cycle. The elemental kinds of carbon are diamond and graphite, and when they are mixed, they are found as carbonates throughout minerals as well as carbon dioxide gases throughout the atmosphere. Carbon is returned to the atmosphere as plants and animals perish and are degraded.

Plants use carbon from the atmosphere to produce photosynthesis. Animals eat these plants, which causes carbon to bioaccumulate in their bodies. Significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing how land is used, and the production of concrete with limestone. The carbon cycle is greatly impacted by human activity.

Therefore, significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing how land is used, and the production of concrete with limestone.

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B. Helium

It has only He atoms

Similar chemical properties

(OPTION C)

Answer:

similar chemical properties

Explanation:

i can confirm his answer

B.The rate of forward reaction increases.

Answer: B) The rate of forward reaction increases.

Nitrogen and oxygen are primary gases in the atmosphere.  

Trace  

Variable  

Primary  

Rare

They are he Primary gasses in the atmosphere with the percentages being 78% nitrogen, 21% oxygen

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The latitude changes the climate, so if the ocean water is in the Antarctic Ocean, it will most likely be cold. The depth of the ocean water matters because it determines the amount of sunlight that the water receives therefore heating it.

Change in temperature affects the rate of reaction since it causes a change in the number of collisions per unit time.  These collisions cause the breaking of bonds and formation of new ones  giving out new products. An increase in temperature increases the rate of collisions hence increasing the rate of reaction while a decrease in temperature leads to a decrease in the rate of reaction due to the decreased number of collisions per unit time. thus the correct choice for blank A is: B. the number of collisions between molecules and for blank B: decrease.

Answer:

A decrease in temperature changes "the number of collisions between molecules. The reaction rate will decrease.

Blank A: "the number of collisions between molecules.

Blank B: decrease.

An increase in temperature causes a rise in the energy levels of the molecules involved in the reaction, so the rate of the reaction increases. Similarly, the rate of reaction will decrease with a decrease in temperature.

Specific Heat is the measure that how quickly or slowly a substance heats or cools.

Specific Heat is defined as the amount of required to raise the temperature of a substance by 1 degree Celsius.

The units of specific heat are usually calories or joules per gram per Celsius degree.

Specific Heat for water is 1 cal/gm /degree Celsius

Specific Heat is the measure that how quickly or slowly a substance heats or cools.

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A is the answer i dont really know but i think is right

Answer : The correct option is, (A) Pressure is directly proportional to density.

Explanation :

Density : It is defined as the mass contained per unit volume.

Formula used for density :

[tex]Density=\frac{Mass}{Volume}[/tex]

From this we conclude that, the density depends on mass and volume of substance.

The density is directly proportional to the mass of substance and inversely proportional to the volume of substance.

[tex]Density\propto \frac{1}{Volume}[/tex]

And as we know that, the volume is also depends on pressure and temperature. That means,

Volume is directly proportional to the temperature and inversely proportional to the pressure.

[tex]Volume\propto Temperature\\\\Volume\propto \frac{1}{Pressure}[/tex]

From this we conclude that,

The relation between the density, volume and pressure is:

[tex]Density\propto \frac{1}{Volume}\propto Pressure[/tex]

The relation between the density, volume and temperature is:

[tex]Density\propto \frac{1}{Volume}\propto \frac{1}{Temperature}[/tex]

From the given option, only option A is correct option. While the other options are incorrect.

Hence, the correct option is A.

The fraction is calculated like this:

[tex] \frac{1}{ {2}^{50 \div 10} } = \frac{1}{32} [/tex]

If you want an universal equation for all problems like this:

[tex] \frac{1}{ {2}^{time \div halflife} } [/tex]

The fraction of the original mass of the radioactive isotope with a half-life of 10 years that will remain after 50 years is 1/32.

We can find the fraction of the original mass with the exponential decay equation:

[tex] N(t) = N_{0}e^{-\lambda t} [/tex]  (1)

Where:

N(t): is the amount of radioactive isotope at time t

N₀: is the initial amount of radioactive isotope

λ: is the decay constant

t: is the time = 50 y

We can find the decay constant as follows:

[tex] \lambda = \frac{ln(2)}{t_{1/2}} [/tex]   (2)

Where:

[tex]t_{1/2}[/tex]: is the half-life of the isotope = 10 y

The decay constant is (eq 2):

[tex] \lambda = \frac{ln(2)}{t_{1/2}} = \frac{ln(2)}{10 y} = 0.069 y^{-1} [/tex]

Now, the fraction of the original amount is (eq 1):

[tex] \frac{N(t)}{N_{0}} = e^{-\lambda t} = e^{-0.069 y^{-1}*50 y} = 0.0317 [/tex]

Since we need to calculate the fraction of the original mass, after some algebraic operations we have:

[tex] \frac{N_{0}}{N(t)} = 32 [/tex]  

[tex] N(t) = \frac{1}{32}N_{0} [/tex]                          

Therefore, the fraction of the original mass that will remain is 1/32.

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Answer:

Terrae  

Explanation:

The mountainous parts of the moon are referred as Terrae. These are bright regions on the moon. Most of the surface of the moon is covered these highlands.

Craters are the depressions created on the surface of the moon as the space rocks strike.

Maria are the dark areas on the surface of the moon. These areas are filled with solidified lava.

Regolith constitutes the upper loose layer of soil, dust, broken rocks and other materials.

As he began to teach inorganic chemistry, Mendeleev could not find a textbook that met his needs. Since he had already published a textbook on organic chemistry in 1861 that had been awarded the prestigious Demidov Prize, he set out to write another one. The result was Osnovy khimii (1868–71; The Principles of Chemistry), which became a classic, running through many editions and many translations. When Mendeleev began to compose the chapter on the halogen elements (chlorine and its analogs) at the end of the first volume, he compared the properties of this group of elements to those of the group of alkali metals such as sodium. Within these two groups of dissimilar elements, he discovered similarities in the progression of atomic weights, and he wondered if other groups of elements exhibited similar properties. After studying the alkaline earths, Mendeleev established that the order of atomic weights could be used not only to arrange the elements within each group but also to arrange the groups themselves. Thus, in his effort to make sense of the extensive knowledge that already existed of the chemical and physical properties of the chemical elements and their compounds, Mendeleev discovered the periodic law.

Dimitri Mendeleev was the most noted Russian chemist who gave the periodic table. He gave the periodic table based on the atomic numbers and how they characterized the physical and chemical properties of the elements.

Therefore, he discovered the periodic table.

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What is it that you’re asking for?

Answer:

Where is the chart

Explanation:

cations are formed when a metal loses electrons, and a nonmetal gains those electrons.