250 ml of nitrogen takes 30 sec and 300 ml of unknown gas takes 45 sec to diffuse through a porous membrane under similar condition. Determine the relative density of unknown gas. ​

The mass per cent of Zn in the mixture is 22%.

Mass percent is a means to describe a component in a specific combination or to convey a concentration. The mass percentage used to describe the solution composition indicates the mass of solute contained in a given mass of solution. The solute's concentration is specified in terms of mass or moles. The mass percent of a solution is calculated by multiplying the grams of solute per gram of solution by 100 to get the percentage.

mass of the mixture = 3.0 g

moles of ZnO in the mixture = 0.010 mol

mass of ZnO in the mixture =  moles × molar mass

= 0.010 mol × 81.38 g/mol

= 0.8138 g

now mass percent of ZnO in the mixture = mass of (ZnO/Total mass) × 100.

27%

now, 81.38 g of ZnO contains = 65.38 g of Zinc.

0.8138 g of ZnO contains = (65.38 / 81.38) × 0.813 g

= 0.6538 g.

so, mass % of Zn in the mixture = (Mass of Zn/ Total Mass) × 100

                                                    = (0.6538 g /3 g) × 100

                                                    = 22%

Hence, the mass percent of Zn in the mixture is 22%.

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Therefore, if you utilise water, you must have a barometer that is 13.534 times the length of a mercury barometer, which may be longer than 11 metres.

Additionally, mercury can reach the same temperature of the atmosphere more quickly than water since it has a lower specific heat than water and is a better heat conductor.

What is Barometer?

Barometer, a tool for calculating atmospheric pressure. A barometer can also be used to determine height because air pressure varies with elevation above or below sea level. Mercury and aneroid barometers are the two primary varieties.

A mercury column whose height can be precisely measured is balanced by atmospheric pressure in a mercury barometer. Mercury barometers are frequently adjusted for the local gravity value and the surrounding temperature in order to boost their accuracy.

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Answer:

ionic

Explanation:

Since Ca is a metal and O is a non-metal, the bond is ionic.

The organic product formed when 1−hexyne is treated with the H₂O, H₂SO₄ and HgSO₄ is 2 - hexanone.

The reaction of the 1−hexyne is treated with the H₂O, H₂SO₄ and HgSO₄ is given as :

CH₃- CH₂ - CH₂ - CH₂ - C ≡ CH   + H₂O / H₂SO₄ / HgSO₄ ----->

1 - hexyne                                                    CH₃- CH₂ - CH₂ - CH₂ - CO - CH₃  

                                                                                     2 - hexanone

Thus, the when the 1 - hexyne react with the   H₂O, H₂SO₄ and HgSO₄ is 2 - hexanone the product is formed is known as the 2 - hexanone.    the above is the reaction for the formation of 2 - hexanone.

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The mixture of spaghetti and meatballs is heterogeneous.

Heterogeneous and homogeneous mixtures are the two types of mixtures. While homogeneous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components. A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.

A mixture is said to be homogenous if its composition is constant throughout. Because the dissolved salt is evenly distributed throughout the whole saltwater sample, the salt water described above is homogenous.

There are five different types of heterogeneous mixtures: suspensions, colloids, liquids, gases, and solids.

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The cellular respiration is a chemical reaction carbon dioxide is one of the product, however it is not a reactant. Therefore, Option A is correct.

Cellular respiration is the process by which biological fuels are oxidized in the presence of an inorganic electron acceptor such as oxygen to produce large amounts of energy, which is then used to drive ATP production.

Cellular respiration is the process by which oxygen and glucose are converted into water and carbon dioxide. Water and carbon dioxide are byproducts of the process, and ATP is the energy that is produced.

The chemical process by which organic compounds release energy is known as respiration. Exergonic reactions transform the compounds into new ones. Energy is released during the hydrolysis of adenosine triphosphate (ATP) to adenosine diphosphate (ADP) and phosphoric acid (Pi) (it is an exergonic reaction).

Thus, option A is correct.

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0.034 mol of carbon dioxide gas, are there in 0.667 L.

We can assume that the volume of one mole of any gas is 22.4 L we know that the pressure of the gas is 1 atmosphere and that the temperature of a gas is 0C

This type is called standard temperature and pressure (STP).

This can be calculated by using the formula in which we can find the moles:

PV =nRT------(1)

Where P is the pressure

V is volume

T is the temperature in Kelvin

R is the ideal gas constant consistent with the units of volume and pressure.

0.667 L x 1 mol/22.4 L = 0.034 mol

And 0.667 liters of CO2 or any other gas at STP would contain 0.034 moles.

If the gas was at some other temperature or pressure, assuming they were “moderate,” you could calculate the number of moles by solving the following formula for n.

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The values of ΔS for water, the surroundings and the universe for the evaporation of water from an open pan at 25°C are positive, negative and positive respectively.

The process involves conversion of water in the liquid state to water in the gaseous state.

H₂O(l)→H₂O (g)

The entropy of a gas is more than that of the entropy of a liquid. Therefore ΔS of water is positive.

In this process, energy from the surroundings needs to be suppiled in order for the conversion of liquid to gas. So, entropy of surroundings decreases. i.e ΔS of surroundings is negative.

The process is spontaneous which means that it obeys the second law of thermodynamics i.e the increase in entropy of  liquid water is larger than the decrease in entropy of the surroundings. Therefore, ΔS universe is positive.

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In de Morceau's nomenclature scheme, the smaller atom appears first.

Nomenclature is an organism name system used in biological classification. Genus and species names, two Latinized nouns drawn from numerous sources, serve as indicators of the species to which the creature belongs.

On August 26, 1743, Antoine-Laurent Lavoisier was born in Paris, France. He was a well-known French chemist and a key player in the 18th century chemical revolution. In addition to co-creating the current system for identifying chemical compounds, he established an experiment-based explanation of the chemical reactivity of oxygen.

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The energy that is contained in the candies is 7.2 cal/g.

We know that the calorimeter is a device that can be used to measure the amount of energy that is contained in a substance. We can see that in this case, we have ben told that the the observed temperature increase is 2.62 ∘C. If the heat capacity of the calorimeter is 48.10 kJ⋅K−1.

We now have the heat or the energy that is contained in the candy as;

H = cdT

c = heat capacity of the calorimeter

dT = The temperature change

Hence;

H = 48.10 kJ⋅K−1 *  2.62 ∘C

H = 126 kJ or 30.11 cal

The nutritional Calories are there per gram of the candy;

30.11 cal/4.20 g

= 7.2 cal/g

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Answer:

water

Explanation:

The manganese content of the original sample is approximately 5.09%.

To determine the manganese content of the original sample, we need to know the atomic weight of manganese and the molecular weights of manganese(III) nitrate and manganese(III) sulfide.

Manganese has an atomic weight of 54.94 g/mol.

Manganese (III) nitrate has a molecular weight of 158.03 g/mol Manganese (III) sulfide has a molecular weight of 160.13 g/mol

The first step is to calculate the weight of manganese in manganese(III) nitrate.

0.2876 g manganese (III) sulfide ÷ 160.13 g/mol manganese (III) sulfide = 0.0018 g manganese

The manganese weight of the original sample can then be determined from the manganese weight of manganese(III) sulfide.

0.0018 g manganese ÷ 0.2876 g manganese (III) sulfide = 0.0626 g manganese per 1.2354 g sample

Finally, the weight of manganese in the sample can be used to calculate the percentage of manganese in the sample.

(0.0626 g manganese ÷ 1.2354 g sample) × 100% = 5.09% manganese

Therefore, the manganese content of the original sample is approximately 5.09%.

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The final volume is 15.3 mL,  the concentration of solution ,He will accomplish this by gradually adding distilled water to the mixture according to law of equivalence-until it reaches a particular final volume.

According to law of equivalence-

where  is initial concentration,  is the final concentration,  is the initial volume and  is the final volume.

Here  = 7.27 M,  = 12.6 mL,  = 6.00 M

So, the final volume is 15.3 mL

The law of equivalence , equivalents of one material will always be equal to the equivalents of the other when two substances react, and the equivalents concentration of any product will always be equal to that of the concentration.

The complete question is:

A chemist must dilute 12.6mL of 7.27 M aqueous sodium nitrate (NaNO3) solution until the concentration falls to 6.00 M.He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in milliliters. Be sure your answer has the correct number of significant digits.

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Combustion reaction of ethane gas gives 4 moles of carbon dioxide and 6 moles of water. Thus, total number of moles of products is 10.

Combustion is the reaction of compounds with atmospheric oxygen to produce carbon dioxide and water. Hydrocarbon gases such as methane, ethane etc. easily burn in oxygen.

The balanced reaction of ethane gas C₂H₆ with oxygen is given here. 2 moles of ethane gas combines with 7 moles of oxygen gas forming 4 moles of carbon dioxide and 6 moles of water.

Here, all the elements of the reaction are balanced in each side and thus, the total number of moles of products is 4 + 6 = 10. Thus, option b is correct.

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The number of atoms equals the number of moles, or N A. Being triatomic, CO 2 1 molecule of CO2 has 1 atom of C and 2 of the total number of atoms, which is 0. 5 3 6. 023 10 23 = 9. 0345 10 23 atoms. C has 0. 5. 1. 6. 023 10 23 = 3. 0115 10 23 atoms, according to the formula.

A molecule is created when two atoms are joined by a chemical bond. A diatomic molecule in this instance (prefix di- means two). The two main diatomic molecules in the air you are inhaling are nitrogen gas and oxygen gas. N2 and O2 are the formulas for them.

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The density of the balls, given the masses and volume of each balls did not change

To Know if there is a change or not, we shall determine the density of both lead balls. Details below:

For the small ball

Density = mass / volume

Density of small ball = 1017 / 90

Density of small ball = 11.3 g/cm³

For the larger ball

Density = mass / volume

Density of larger ball = 2825 / 250

Density of larger ball = 11.3 g/cm³

From the above calculations, we obtained:

Thus, we can conclude that the density of the lead balls did not change

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The rate constant for the nuclide according to first-order kinetics is 0.0802 per minute.

Nuclear Decay in First-Order Kinetics:

m(t) = Me∧(-αt)

where m(t) = mass of nuclide after decay at time t;

M = mass of nuclide before decay;

α = rate constant of decay;

t = time for the decay.

When a fixed percentage of the drug is excreted per unit of time, this is known as first-order kinetics.

For example, The amount of drug in the body has a direct relationship to the rate of removal. The amount of medication eliminated per unit of time increases with concentration. The medication concentration decreases by 50% for each half-life.

Now,

m(t) = Me∧(-αt)

⇒e∧(αt) = [tex]\frac{m}{m(t)}[/tex]

applying ln on both sides;

αt = ln([tex]\frac{m}{m(t)}[/tex])

α = [tex]\frac{ln(m/m(t))}{t}[/tex]

here t= 23 minutes, M = 12.9 grams, m(t) = 2.04 grams;

dropping these values in the above equation we get,

α = [tex]\frac{ln(m/m(t))}{t}[/tex]

α = 0.0802 per minute;

The rate constant for the nuclide according to first-order kinetics is 0.0802 per minute.

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Explanation:

There are several pieces of evidence that can be used to identify chemical changes, other than a change in color. Some of these include the production of a gas, the formation of a precipitate, a change in temperature, and a change in the state of matter (e.g. from a solid to a liquid or vice versa). For example, if a solid substance is added to a liquid and bubbles of gas are produced, this is evidence of a chemical change. Similarly, if two clear solutions are mixed together and a solid precipitate forms, this is also evidence of a chemical change. Additionally, if a substance is heated and it changes from a solid to a liquid or from a liquid to a gas, this is also evidence of a chemical change.

C7H16, see as the compounds who shows optical isomerism have a chiral carbon so an unsymmetrical alkane can show the optical isomerism. 6 carbon and 8 carbon alkane is not the answer. So, the smallest alkane is 7 carbon alkane is 3 methyl hexane which have 3rd carbon as chiral carbon.

What is Molar mass?

Molar mass is the amount of mass that makes up one mole of a substance. It may also be referred to as the mass of the substance, measured in grammes, that makes up one mole of the substance. There are 6.023 x 1023 molecules in a mole. It is known as Avogadro's number. The most significant concept in physical chemistry is molar mass. The molar mass, the molar mass formula, the molecular mass and its formula, the distinction between the molar and molecular masses, and the relative molar mass and its formula are all topics covered in this article.

For elements or molecules, molar mass is displayed. The molar mass is simply the element's mass represented in atomic mass units in the case of single elements or individual atoms. In other words, an individual atom's atomic mass and molar mass are same.

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Answer:

[tex]\huge\boxed{\sf v = 39.872\ dm\³}[/tex]

Explanation:

Moles = n = 1.78 moles

Molar volume = V = 22.4 dm³

Volume = v = ?

v = n × V

v = 1.78 × 22.4

[tex]\rule[225]{225}{2}[/tex]

After 10 days, there will be approximately 15,625 radioactive atoms left.

What is radioactive?
The process through which an unstable nucleus loses energy through radiation is known as radioactive decay, also recognised as nuclear decay, radioactive contamination, radioactive disintegration, as well as nuclear disintegration. A substance that has unstable nuclei is regarded as radioactive. Alpha decay, beta decay, and gamma decay are three of the most frequent types of decay, and they all involve the emission of one or even more particles. Beta decay is a result of the weak force, while the nuclear force and electromagnetism are in charge of the other two mechanisms. Electron capture, which occurs when an unstable nucleus seizes an inner electron in one of the electron shells, is the fourth common type of decay.

This is because the half life of the nuclide is 2 days, meaning that after 2 days, half of the 100,000 atoms will have decayed and only 50,000 atoms will remain. After 10 days, the number will have halved 6 times, leaving 15,625 atoms (50,000/2^6).

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To solve such this we must know the concept of chemical reaction. Therefore, the rate of reaction increases as the concentration of HCl increases.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

The rate of reaction depends on the number of collisions among the reactants and their orientation. As the number of concentration of reactants  increases, the number of collisions increases and the rate of reaction also increases.

Therefore, the rate of reaction increases as the concentration of HCl increases.

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Answer: To determine the volume of 1.60 x 10^-3 M HCl that is needed to neutralize 14.5 mL of a saturated Ca(OH)2 solution, we can first calculate the number of moles of Ca(OH)2 that are present in the solution. We can do this by using the solubility of Ca(OH)2 in water (0.185 g/100.0 mL) and the volume of the solution (14.5 mL):

0.185 g Ca(OH)2 / 100.0 mL * 14.5 mL = 0.026975 g Ca(OH)2

Next, we can use the molar mass of Ca(OH)2 (74.1 g/mol) to convert the mass of Ca(OH)2 to moles:

0.026975 g Ca(OH)2 / 74.1 g/mol = 0.003634 mol Ca(OH)2

Since the reaction between HCl and Ca(OH)2 is a 1:1 mole ratio, we can then determine the number of moles of HCl that are needed to neutralize the Ca(OH)2 by dividing the number of moles of Ca(OH)2 by 1:

0.003634 mol Ca(OH)2 / 1 = 0.003634 mol HCl

Finally, we can use the concentration of the HCl solution (1.60 x 10^-3 M) and the number of moles of HCl that are needed to determine the volume of HCl that is required:

0.003634 mol HCl / (1.60 x 10^-3 M) = 0.0230 L HCl

Therefore, 0.0230 L (or 23.0 mL) of 1.60 x 10^-3 M HCl is needed to neutralize 14.5 mL of a saturated Ca(OH)2 solution.

The increasing order of lattice energy for the given ionic compounds is NaBr <NaCl< CaCl₂ < MgO.

Ionic compounds refer to compounds comprising of ions that form charged particles when an atom (or group of atoms) gains or loses electrons. A cation is an ion charged positively; an anion is an ion charged negatively. Lattice energy refers to the energy required to convert one mole of an ionic solid into gaseous ionic constituents. Alternatively, it refers to the energy that must be supplied to one mole of an ionic crystal in order to separate it into gaseous ions in a vacuum via an endothermic process. Lattice energy is the energy gap between the energy of the separate gaseous ions and the energy of the ionic solid. Lattice energy increases with decrease in size and increase in charge. Hence, based on this the order of increasing lattice energy is NaBr, NaCl,  CaCl₂, and MgO.

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The end point in a titration of a 25.00 mL aq H₂SO₄ was reached by addition of 33. 87 ml of 0.4500 m NaOH. The molarity of H₂SO₄ is 0.3048 M.

The balanced chemical reaction is given as,

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

For exact neutralization of Va(mL) of an acid having Molarity Mₐ and basicity Nₐ by V(b) ml of a base having molarity M(b) and acidity N(b).

N(a) M(a) V(a) = N(b) M(b) V(b)

For H₂SOy basicity ,n(a) = 2

For NaOH acidity n(b) = 1

Va (H₂SO₄) = 25.00 mL

Vb (NaOH) = 37.87 mL

Mb (NaOH) = 0.4500M 

Ma (H2S04) = ?

Substitute the values to get the value of Ma,

2 × Ma × 25 mL = 1 × 0.4500 M × 33.87 mL

⇒ Ma = (1 × 0.4500 M × 33.87 mL) ÷ 50

⇒ Ma = 0.3048 M

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Answer:-Science have researched more facts and cool things about it-It would have more facts and things to learn-The quality would be better and more understandingI just tried 3 quick ideas I hope it can help a bit

Explanation:

Answer:

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The ease with which the charge distribution in a molecule can be distorted by an external electrical field is called the polarizability.

The polarizability can be defined as the the tendency of the matter, when they are subjected to an electric field,  the electron cloud of the matter will distorted. as the number of electrons increases the polarizability of the atom increases. the polarizability tells us that how the electrons distorted around the atom.

Thus, the more the polarizability , the more the stability of the anion. the larger the atom size  , the electron will more away from the nucleus, the mores polarizable.

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2Li2S + Sn(SO4)2 → 2Li2(SO4) + SnS2 is Balanced chemical equation.

What is Balanced chemical equation?

A balanced chemical equation is a chemical reaction that has equal numbers of moles of chemical substances both in the reactant and the product side.

A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides.

In a balanced chemical equation, the mass and the change are both equal.

From the missing image that is attached below, we can see that the picture depicts that we have:

The reactant side:

3 molecules of CH₄ and 3 molecules of N₂Cl₄

The product side:

3 molecules of CCl₄, 3 molecules of N₂ and 6 molecules of H₂

Therefore, the balanced chemical equation for the reaction is:

3CH₄ + 3 N₂Cl₄ → 3 CCl₄ + 3N₂ + 6H₂

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