How many grams of sulfur dioxide gas would occupy 379.0 gal at a temperature of 87.20 degrees celsius and a pressure of 10.42 psi

Given that uranium-235 has a half-life of 58 minutes and initially there is 1000 grams of it. To find out how much would be left after 2 hours.

we need to convert the 2 hours into minutes which is as follows:1 hour = 60 minutes Thus, 2 hours = 2 * 60 minutes = 120 minutes After the first half-life period of 58 minutes, half of the uranium-235 will decay and there will be 1000/2 = 500 grams of it remaining. After the second half-life period of 58 minutes, half of the 500 grams will decay and there will be 250 grams of uranium-235 remaining.

Now, we have 120/58 = 2.07 half-life periods of uranium-235. Therefore, the amount of uranium-235 remaining after 2 hours can be calculated using the following formula: Amount Remaining = Initial Amount × (1/2)².07= 1000 × 0.153= 153 grams. So, after 2 hours, there will be 153 grams of uranium-235 remaining.

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Answer:

Explanation:

The valency of a chemical element refers to the number of electrons that it can gain or lose in a chemical reaction. The valency can also be thought of as the charge on the ion of the element.

The valencies of the compounds you have provided are:

K3PO4 (Potassium Phosphate)

Potassium (K) has a valency of +1

Phosphorus (P) has a valency of +5

Oxygen (O) has a valency of -2

Al2(SO4)3 (Aluminum Sulfate)

Aluminum (Al) has a valency of +3

Sulfur (S) has a valency of +6

Oxygen (O) has a valency of -2

NaNO3 (Sodium Nitrate)

Sodium (Na) has a valency of +1

Nitrogen (N) has a valency of +5

Oxygen (O) has a valency of -2

It's worth noting that valency of elements within a compound can be determined by the oxidation state of the element and by the chemical formula of the compound. The oxidation state is determined by the number of electrons gained or lost by the element.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{8.5 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 141.19601...\)

We have the final answer as

Hope this helps you

In the given weigh on a balance and recorded masses 2.25g is the accuracy and precision of the balance

A balance used to weigh quantities to a very precise number, usually up to one milligram and accuracy is the balance related to the measurement uncertainty of each reading.

Here given data is three students are given = 200g weight and record the following masses = 150g, 151g, 150g

We have to calculate accuracy and precision of the balance = ?

So accuracy and precision of the balance = sum of data/no of measurement

Here sum of data means = 150g, 151g, 150g and no of measurement = 200g

accuracy and precision of the balance =  150g+151g+150g/200

accuracy and precision of the balance = 2.25g

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Answer:

Should be number 4, quartz.

Explanation:

Quartz is rougher than calcite, therefore it's able to scratch it.

The mass change in grams accompanying the formation of 1 mol Cu and 1 mol H₂O in the following reaction is:

CuO(s) + H₂(g) → Cu(s) + H₂O(g)  ΔH° = +84.5kJ

63.55 grams for Cu and 18.02 grams for H₂O.

To determine the mass change accompanying the formation of 1 mol of Cu and 1 mol of H₂O in the given reaction, we need to consider the stoichiometry of the reaction and the molar masses of the substances involved.

From the balanced chemical equation:

CuO(s) + H₂(g) → Cu(s) + H₂O(g)

We can see that the reaction consumes 1 mol of CuO and 1 mol of H₂ and produces 1 mol of Cu and 1 mol of H₂O.

Let's calculate the molar mass of Cu using the atomic masses:

Molar mass of Cu = 63.55 g/mol

The formation of 1 mol of Cu will have a mass change of 63.55 grams.

Next, let's calculate the molar mass of H₂O:

Molar mass of H₂O = (2 * 1.01 g/mol for hydrogen) + (16.00 g/mol for oxygen)

= 18.02 g/mol

The formation of 1 mol of H₂O will have a mass change of 18.02 grams.

Therefore, the mass change accompanying the formation of 1 mol of Cu and 1 mol of H₂O in the given reaction is 63.55 grams for Cu and 18.02 grams for H₂O.

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BOD = (14.8 - DO2) x 0.125 = 211.3 mg/LDO2 = 12.175 mg/LHence, the Biochemical Oxygen Demand (BOD) of the sample is 13.825 mg/L.

The given terms in the question are,211.3 mg/ LQ.6: 100 ml waste water sample was diluted with 800 ml of water. Initial dissolved oxygen level (DO:) was found to be 14.8 mg/1. After 5 days of incubation, the final dissolved oxygen level (DO) was found.In order to calculate the Biochemical Oxygen Demand (BOD) of a sample, the difference between the initial dissolved oxygen level (DO:) and the final dissolved oxygen level (DO) needs to be found.The formula for Biochemical Oxygen Demand is:Biochemical Oxygen Demand (BOD) = (Initial Dissolved Oxygen level) - (Final Dissolved Oxygen Level)BOD = DO1 - DO2BOD = 14.8 - DO2BOD = 14.8 - DO2.

To determine the value of DO2, first the dilution factor needs to be found.Dilution Factor = Volume of initial sample / Total VolumeDilution Factor = 100 / 800Dilution Factor = 0.125Since the initial sample was diluted by a factor of 0.125, the BOD can be calculated as follows:BOD = (DO1 - DO2) x Dilution Factor211.3 mg/L is the value of LQ, which is the conversion factor to convert milligrams per liter of oxygen to BOD value.

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The type of irony used in "reckless endangerment of human life" is verbal irony. Verbal irony is a figure of speech in which words are used to mean something different from their literal meaning.

In this instance, the phrase "reckless endangerment of human life" refers to behavior that puts people's lives in danger. However, it is ironic because it is a criminal offense that should be avoided and yet it is taking place. Verbal irony is often used for humorous or dramatic effect. This type of irony is used to create a contrast between what is said and what is meant. In this case, the phrase "reckless endangerment of human life" is used to describe behavior that is extremely dangerous, yet it is ironic because it is the opposite of what should be happening.

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Answer:

false

Explanation:

first of all;-energy lead to an indotermic reaction.

indotermic is a reaction that absorbs energy \

*it has positive enthalpy of reaction

*Heat content of product is greater than that of reactant

*Heat is added to reactant side

example;- CO^2+2H^2+891kj --------- CH4 +2O2

Answer:

bamboo is the biggest/tallest grass in the world

Answer:

Giant Bamboo

Explanation:

Giant bamboo, which can grow up to 151 feet tall, is the largest variety of grass.

the answers is cacih2

wjdgagqjdhdgahahdhvddvvsvshsd

The formate ion can have one of two resonance structures, which are as follows: The most electronegative element, namely oxygen, is given a negative charge.

Resonance structures don't have isomers. Different atom and electron configurations distinguish isomers. The positioning of the electrons is the only distinction between resonance types.

Resonance structures more accurately depict a Lewis dot structure because they make molecular bonding visible.

In valence bond theory, resonance is a term used to describe how different contributing structures (or forms, also known as resonance structures or canonical structures) combine to generate a hybrid resonance (or hybrid structure) in certain molecules or ions.

Ozone, or O3, has two main resonance structures that each contribute equally to the overall hybrid structure of the molecule. All structures show the 18 valence electrons needed, with 6 in 3 bonds and 12 on the oxygen atoms as lone pairs.

Resonance occurs when the frequency matches the object's resonant frequency, which it reaches. Resonance occurs when the vibrations of one object cause the frequency of its oscillations to increase.

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Answer:

3

Explanation:

One of the pieces of evidence of the big bang theory where that celestial objects are scattered in the universe because of an explosion that supports the idea of the big bang.

The big bang is how astronomers explain the way the universe began.

The evidence that I've gathered from the widget that demonstrates that the universe is expanding is that galaxies and other celestial objects are moving away from each other, which is also one of the evidence of the big bang theory where the celestial objects are scattered in the universe because of an explosion that supports the idea of the big bang.

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Hydronium ion concentration increases by 100 fold on decreasing the pH of solution from 4 to 2.

In order to compute pH, the log of the hydronium ion concentration was used.

pH = -log [Hydronium ion concentration]

So, at pH 2.0 number of hydronium ions are 10^-2

And at pH 4.0 number of hydronium ions are 10^-4

By decreasing pH there will be 100 times more hydronium ions.

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Answer: Option (b) is the correct answer.

Explanation:

It is known that,

                   pH + pOH = 14

So, pOH = 14 - pH

As the given pH is 9.3. Hence, pOH for the given solution will be calculated as follows.

          pOH = 14 - 9.3

                   = 4.7

Therefore, pOH of the given solution is 4.7.

Answer:

A. Noble gas configuration

(a) All the bonds present in urea are polar.

(b) The oxygen atom will carry the partial negative charge at the end of the bond dipole, thus C=O is the most polar bond.

When atoms share their electrons inequitably, polar covalent bonds are formed, whereas non-polar covalent connections are formed when atoms divide their electrons more evenly.The uneven electron sharing is caused by discrepancies in the electronegativities of the two atoms sharing the electrons

(a) All of the bonds in a urea molecule are polar. The compound's formula is [(NH₂)₂CO]. The bonds (C=O, N-H, and C-N) are all polar because to large variances in electronegativities. O has a higher electronegative potential than C, and N has a higher electronegative potential than C and H.

(b) All the bonds present in urea are polar, however, the most polar bond is the connection between carbon and oxygen due to its greater electronegativity than a nitrogen atom (N), thus C=O is the most polar bond.

As the atom that will attracts the electrons due to its electronegative nature, the oxygen atom will carry the partial negative charge at the end of the bond dipole.

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Answer:

The space in the container so how small it is the more pressure is going to build up. YOUR WELCOME AND HAVR A GOOD DAY.

Answer:

the Respiratory System and  Circulatory system

Explanation:

Answer:

Amorphous solid is a form of solid

Explanation:

Amorphous solid is a solid in which atoms are not arranged in a definite geomatric pattern for eg. glass,paper etc

Answer:

fixed shape and a definite volume

Explanation:

Answer:

a solid has a definite shape and definte volume

Explanation:

Adding solutions to a precipitate can alter its solubility by disrupting or forming chemical bonds that hold it together, as observed in silver chloride precipitate dissolution in ammonia due to complex ion formation or the decreased solubility of calcium carbonate precipitate when treated with hydrochloric acid through acid-carbonate reaction.

Adding different additional solutions to a precipitate can affect its solubility by changing the chemical environment of the solution. Precipitates are insoluble solids that form when two solutions react and a solid compound is produced. However, some precipitates can dissolve in certain conditions due to a chemical reaction that occurs between the precipitate and the added solution.

For example, if a precipitate of silver chloride (AgCl) is formed in a solution, it is insoluble in water but can dissolve in a solution of ammonia (NH₃) due to the formation of a complex ion. The equation for this reaction is,

AgCl(s) + 2 NH₃(aq) → [Ag(NH₃)₂]⁺(aq) + Cl⁻(aq)

In this reaction, the ammonia molecules coordinate with the silver ions to form a complex ion that has a greater stability than the original precipitate. This causes the silver chloride to dissolve and the solution to become clear.

In contrast, adding an acidic solution to a precipitate can cause the precipitate to become more insoluble, since the acidic solution can protonate the anions that are part of the precipitate and reduce their solubility. For example, adding hydrochloric acid (HCl) to a precipitate of calcium carbonate (CaCO₃) will cause the calcium carbonate to become more insoluble due to the reaction:

CaCO₃(s) + 2 HCl(aq) → CaCl₂(aq) + CO₂(g) + H₂O(l)

In this reaction, the acid reacts with the carbonate ion (CO₃²⁻) to produce carbon dioxide gas, which reduces the concentration of carbonate ions in the solution and shifts the equilibrium towards the solid precipitate.

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There are 6.022 x 10^23 atoms in 2 moles of oxygen atoms. There are 2 x 6.022 x 10^23 atoms in 2 moles of oxygen molecules.

Molecules are the smallest particles of a substance that can exist on its own and retain the chemical properties of that substance. Molecules are composed of atoms that are held together by chemical bonds. Molecules can be composed of atoms of the same element, such as oxygen molecules that are composed of two oxygen atoms, or of atoms of different elements, such as water molecules composed of two hydrogen atoms and one oxygen atom.

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approximately 0.27 grams of BaF2 will be dissolved in 125 mL of the saturated solution of BaF2.

How to solve the problem?

The solubility product constant (Ksp) for BaF₂ is given as 1.50 x 10⁻⁶. This means that at equilibrium, the product of the concentration of Ba₂₊ and F- ions will be equal to Ksp.

The balanced equation for the dissolution of BaF₂ is BaF₂(s) ⇔ Ba₂₊(aq) + 2F-(aq).

We can use the Ksp value to determine the concentration of Ba₂₊ and F- ions in a saturated solution of BaF₂

Let x be the molar solubility of BaF₂. Then, the concentration of Ba₂₊ ions in the saturated solution will be x mol/L, and the concentration of F- ions will be 2x mol/L, according to the stoichiometry of the balanced equation.

The Ksp expression can be written as:

Ksp = [Ba₂₊][F-]²

Substituting the expressions for the concentrations of Ba₂₊ and F- ions, we get:

Ksp = x (2x)⅝ = 4x³

Solving for x, we get:

x³= Ksp / 4 = 1.50 x 10⁻⁶/ 4 = 3.75 x 10⁻⁷

x = (3.75 x 10⁻⁷)¹/³ = 0.0077 mol/L

This means that the molar solubility of BaF₂ is 0.0077 mol/L in water.

To determine the mass of BaF₂ that will be dissolved in 125 mL of this saturated solution, we can use the following formula:

mass = concentration x volume x molar mass

The molar mass of BaF₂ is 175.32 g/mol.

The concentration of BaF₂ Is equal to its molar solubility, which is 0.0077 mol/L.

The volume of the solution is 125 mL, which is equal to 0.125 L.

Substituting these values in the formula, we get:

mass = 0.0077 mol/L x 0.125 L x 175.32 g/mol

mass = 0.27 g (approx.)

Therefore, approximately 0.27 grams of BaF₂will be dissolved in 125 mL of the saturated solution of BaF₂

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Answer:

0.017g/mol

Explanation:

according to the mole concept to calculate the number of moles of a substance you use the formula

number of moles= mass/molecular mass

=4.5g/254g/mole

=0.017moles

I hope this helps and sorry if it's wrong

Answer:

magnesium and oxygen

Explanation:

80 g of Ar will have the greatest volume at stp.

The volume of the gases at STP is calculated by applying ideal gas equation as follows;

The ideal gas equation is given as;

PV = nRT

where;

From the equation given above, we can see that, the volume of the gas increases as the number of moles of the gases increases.

moles of 80 g Xe = 80/131 = 0.61

moles of 80 g of Kr = 80/84 = 0.95

moles of 80 g of Ar = 80 /40 = 2 moles

So Argon has the highest number of moles and will have the greatest volume at stp.

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