A 5.73 L flask at 25°C contains 0.0388 mol of N2, 0.147 mol of CO, and 0.0803 mol of H2. What is the total pressure in the flask in atmospheres?

For 5 moles of Fe(OH)3, 5 moles of sulfuric acid are needed.

Moles are small, burrowing mammals found in many parts of the world. They are members of the family Talpidae, and range in size from about two inches to about eight inches in length, depending on the species. Moles have cylindrical bodies with short, velvety fur and enlarged front feet adapted for digging. They feed primarily on small insects and earthworms, and their long claws make them excellent tunnelers. Moles live in underground burrows which they dig out with their front feet and claws. They are solitary creatures, and they are active day or night. Moles are rarely seen above ground, and they are generally considered to be harmless animals.


A) In order to calculate the number of moles of sulfuric acid needed to react with 5 moles of Fe(OH)3, we can use the balanced chemical equation for this reaction: 3Fe(OH)3 + 3H2SO4 → Fe2(SO4)3 + 6H2O. From this equation, we can see that for every 3 moles of Fe(OH)3, 3 moles of sulfuric acid are required. Therefore,
for 5 moles of Fe(OH)3, 5 moles of sulfuric acid are needed.

B) From the balanced chemical equation for this reaction, we can see that for every 3 moles of Fe(OH)3, 3 moles of Fe2(SO4)3 are produced. Therefore, for 5 moles of Fe(OH)3, 5 moles of Fe2(SO4)3 are produced. Additionally, for every 3 moles of Fe(OH)3, 6 moles of water are produced. Thus, for 5 moles of Fe(OH)3, 10 moles of water are produced.

C) The mass of each product produced can be calculated by using the molar mass of the corresponding compound. For example, the molar mass of Fe2(SO4)3 is 392.16 g/mol. Therefore, for 5 moles of Fe2(SO4)3, the mass of the product produced is 1960.8 g. Similarly, the molar mass of water is 18.015 g/mol. Therefore, for 10 moles of water, the mass of the product produced is 180.15 g.

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To have only two significant figures we must have  to add a decimal point and two zeros.

The term significant figures refers to the figures that we could assign a place value. These are the figures that could be assigned a place in a string of digits. The nonzero values to which it is possible that we could give a place can be called a significant figure.

Having established that, we can see that the number 52 has two significant figures. The number 5.209 has three significant figures. If we want the value 52 to retain having only two significant figures then we have to add a decimal point and two zeros.

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Answer:

0.071 moles of Na₃PO₄ .

Explanation:

Given data:

Number of molecules of Na₃PO₄ = 4.3× 10²² molecules

Number of moles = ?

Solution:

1 mole contain 6.022 × 10²³ molecules

4.3× 10²² molecules × 1 mol / 6.022 × 10²³ molecules

0.71× 10⁻¹ mol

0.071 mol

The number 6.022 × 10²³ is called Avogadro number.

"It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance"

Answer:

B) "When substances are chemically combined, the properties of the new substances that are formed are often different from the properties of the original substances."

Explanation:

From the information given, the question was juxtaposing how dangerous the reactants Sodium and Chlorine were at their elemental, natural states with how harmless the product is by combining both of them. There isn't any other statement beside B which is supported by this.

Usually however, most reactions that make NaCl are done through acid-base titrations because they form the salt and water when neutralized.  

Answer:

B

Explanation:

All substances have their own unique chemical and physical properties. When substances are chemically combined (i.e., when substances undergo a chemical reaction), the properties of the new substances that are formed are often different from the properties of the original substances.

The gas that has a volume of 752 mL at 1.98 atm and 62°C is most likely NO₂ (option D).

The volume of a sample of gas can be calculated using the following formula:

PV = nRT

Where;

According to this question, the volume of a sample of gas (2.49 g) was 752 mL at 1.98 atm and 62°C. The number of moles is as follows:

1.98 × 0.752 = n × 0.0821 × 335

1.489 = 27.5n

n = 0.054mol

molar mass of the gas = 2.49g ÷ 0.054mol = 45.99g/mol

The gaseous substance with the molar mass of 45.99g/mol is NO₂.

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The specific heat capacity of the zinc metal, given that 2.40×10¹ g of zinc metal at 2.10×10¹ °C is added to the water is 0.27 J/gºC

First, we shall obtain the heat absorbed by the water when the zinc metal was added. This is shown below:

Q = MCΔT

= 5.60×10¹ × 4.184 × -2.1

= -492.0384 J

Now, we shall determine the specific heat capacity of the zinc metal. Details below:

Q = MCΔT

492.0384 = 2.40×10¹ × C × 76

492.0384 = 1824 × C

Divide both sides by 1824

C = 492.0384 / 1824

= 0.27 J/gºC

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we can determine the enthalpy of reaction for the hypothetical reaction A2X4(l) + X2(g) → 2AX3(g) using the following steps:

Hess's Law of Constant Heat Summation  states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes.

The law is  Hess's Law  of Constant Heat Summation  is described as a manifestation that enthalpy is a state function.

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According to the concept of stoichiometry and balanced chemical equation,165 g of carbon dioxide is produced on burning of 120 g of methanol.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

According to the given chemical equation, as 64 g of methanol produces 88 g of carbon dioxide .

∴120 g of methanol produces 120×88/64=165 g of carbon dioxide.

Thus, 165 g of carbon dioxide is produced by 120 g of methanol.

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The number of mole present in 87.653 g of lead(II) oxide is 0.393 mole

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

With the above formula, we can determine the mole of lead(II) oxide. Details below:

Mole = mass / molar mass

Mole of lead(II) oxide = 87.653 / 223.2

Mole of lead(II) oxide = 0.393 mole

Thus, 87.653 g of lead(II) oxide contains 0.393 mole

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1) What does this diagram tell us?

This graph shows that the rate of reaction is affected by enzymes. If we add an enzyme to a reaction the rate of that reaction will increase.

2) Effect of enzyme on reaction.

The enzyme increases the rate of the reaction. This happens because gives an alternative way for the reaction to occur. Lower activation energy.

3) Why does the shape of the reaction with the enzyme flatten out?

This means that the enzyme reaches a speed limit and cannot go over it.

Answer:

0.52 J/g degree Celsius

Explanation:

Answer:

We can use the ideal gas law, PV = nRT, to solve for the density at STP (standard temperature and pressure). At STP, the temperature is 273.15 K and the pressure is 1 atm. We know the molar mass of NO2 is 46.01 g/mol. We also know that 1 mole of any gas at STP occupies a volume of 22.4 L.

First, we can calculate the number of moles of NO2 at STP:

n = PV/RT = (1 atm)(22.4 L)/(0.08206 L·atm/mol·K)(273.15 K) = 1.00 mol

Next, we can calculate the mass of 1 mole of NO2:

46.01 g/mol

Finally, we can calculate the density of NO2 at STP:

density = mass/volume = (46.01 g/mol)/(22.4 L) = 2.054 g/L

Therefore, the density at STP of NO2 gas (molar mass = 46.01 g/mol) in grams per liter is 2.054 g/L.

Explanation:

Answer:

Astronomers study light from distant objects. ... Optical telescopes collect visible light. The three main types are reflecting telescopes, refracting telescopes, and catadioptric telescopes. Radio telescopes collect and focus radio waves from distant objects.

Answer:

S.G = 0.79.

Explanation:

Hello there!

In this case, according to the given information in the problem, it turns out possible for us to calculate the specific gravity of this alcohol by simply dividing its density, 0.79 g/mL by that of the water, 1 g/mL just as a reference for us to work with:

\(S.G=\frac{\rho _{alc}}{\rho _w}\)

Thus, we plug in the densities to obtain:

\(S.G=\frac{0.79g/mL}{1g/mL}\\\\S.G=0.79\)

Which is dimensionless as g/mL is cancelled out due to its presence on both top and bottom of the previous formula.

Regards!

The north pole of one magnet is near the South pole of the other magnet.

The ends of a magnet are called its poles. One end is called the north pole, the other is called the south pole. If you line up two magnets so that the south pole of one faces the north pole of the other, the magnets will pull toward each other.

In the given reaction:  \(HI + H_2O \rightarrow H_3O +I^-\), the acid-conjugate base pair is \(HI\)(hydroiodic acid) and \(I^-\) (iodide ion).

An acid-conjugate base pair consists of an acid and its corresponding conjugate base. In an acid-base reaction, an acid donates a proton (\(H^+\)) to a base, resulting in the formation of a conjugate base. The acid and its conjugate base are related by the transfer of a proton.

In the given chemical reaction, \(HI + H_2O \rightarrow H_3O +I^-\),

Thus, the acid-conjugate base pair in the given chemical reaction is \(HI\) and \(I^-\).

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Answer:

decreases by 10 gram

Explanation:

The bond in NO3- ion is polar covalent and oxygen pulls the electrons.

A polar covalent bond is formed when there is a significant difference in electronegativity between covalently bonded atoms.

Such bonds are said to be polar covalent with the electron density tilted towards one of the bonding atoms.

In NO3-, Nitrogen and oxygen have an electronegativity difference of 0.5, so the bond is polar covalent, with oxygen pulling the electrons toward it.

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The answer is A, Nitrogen and oxygen have an electronegativity of 0.5, so the bond is polar covalent, with oxygen pulling the electrons toward it.

Electronegativity is defined as, a value that describes the relative strength with which an atom of an element attracts electrons to itself in a chemical bond. Moreover, electronegativity can be used to define a bond.

A electronegativity of 0.5-1.7 is determined to be a polar covalent bond, thus the bonds in nitrate is polar covalent.

We know that electronegativity increases on the periodic table across a period, but decreases down a group. Thus, oxygen has a greater electronegativity than nitrogen.

Answer:

Explanation:

making sure the liquid inside the thermometer is at eye level when taking the temperature

making sure the bulb of the thermometer does not touch the bottom of the beaker or the ice when taking the temperature

The mass percent of Cl in SiCl2I2 is 20.13%.

The chemical formula of SiCl2I2 can be broken down into its constituent elements, Si, Cl, and I. The total mass of the compound is the sum of the masses of these elements. Then, we can find the mass percentage of chlorine in SiCl2I2.
The mass of Si is 28.09 g/mol, the mass of Cl is 35.45 g/mol, and the mass of I is 126.9 g/mol. Therefore, the molar mass of SiCl2I2 is:
Molar mass of SiCl2I2 = (28.09 g/mol) + 2(35.45 g/mol) + 2(126.9 g/mol)
= 352.79 g/mol
To find the mass percentage of chlorine in SiCl2I2, we need to determine the mass of chlorine in the compound. There are two chlorine atoms in the molecule, so the mass of chlorine is:
Mass of Cl = 2(35.45 g/mol) = 70.9 g/mol
Now, we can calculate the mass percentage of Cl in SiCl2I2:
Mass percentage of Cl = (Mass of Cl / Molar mass of SiCl2I2) × 100%
= (70.9 g/mol / 352.79 g/mol) × 100%
= 20.13%
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Answer:

SI-28

Explanation:

Answer:

Answer:

That means that the number of O2 molecules present in 2g of O2 is equal to 0.0625*NA. That's 3.76375*10^22. That is a lot of molecules. And we have not even reached the atomic level

Answer:

Explanation:

Combined Gas Law

T2= T1P2V2/ (P1V1) = 348.15 X .5 X 3.4/(2 X 7.5) =39.46 K or -233.69C

Answer:

Tinatapon yong food

Explanation:

It's dangerous to eat

If a retail food establishment unknowingly contaminates food with dangerous bacteria, it can lead to foodborne illness outbreaks and pose a risk to public health.

If a retail food establishment, such as a restaurant or grocery store, unknowingly contaminates food with dangerous bacteria, several potential consequences can occur. Firstly, contaminated food can be distributed to customers, increasing the risk of foodborne illnesses. Consuming food contaminated with pathogens like Salmonella, E. coli, or Listeria can result in gastrointestinal symptoms, such as diarrhea, vomiting, and abdominal pain, and in severe cases, it can lead to hospitalization or even death, especially in vulnerable populations.

Secondly, if customers become sick due to consuming contaminated food, it can lead to negative publicity and damage the reputation of the establishment. This can result in a loss of customers, financial implications, and potential legal consequences if negligence is proven.

Additionally, if a foodborne illness outbreak occurs, it may trigger an investigation by local health authorities. The establishment may face inspections, potential closure, and the need for corrective actions to address the contamination issue. Public health agencies may also conduct trace-back investigations to identify the source of the contamination and prevent further spread.

Overall, the unknowing contamination of food with dangerous bacteria in a retail food establishment can have serious consequences, including the risk of foodborne illnesses, negative impact on the establishment's reputation, legal implications, and potential regulatory actions. It highlights the importance of proper food handling, hygiene practices, and regular monitoring to ensure the safety of the food served to the public.

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Therefore, the amount of energy required to change 207 g of water ice at −10 ∘C to steam at 125 ∘C is 744.3618 kJ.

Similar to how kilometres measure distance, a kilojoule is a measurement used to measure energy. Some nations continue to use the Calories (Cal) system, which was once used to quantify food energy. These are the conversions: 1 kJ equals 0.2 Cal.

To figure out how much energy is needed to convert 207 g of water ice at -10°C to steam at 125°C, we must divide the process into several stages and figure out how much energy is needed for each one:

Heating ice from -10°C to 0°C:

q1 = m × Cm(ice) × ΔT

= 207 g ÷ 18.02 g/mol × 36.57 J/(mol⋅∘C) × (0 - (-10)) ∘C

= 41324.8 J

= 41.3248 kJ

Melting ice at 0°C:

q2 = n × ΔHfus

= m ÷ M × ΔHfus

= 207 g ÷ 18.02 g/mol × 6.01 kJ/mol

= 56.804 kJ

Heating water from 0°C to 100°C:

q3 = m × Cm(water) × ΔT

= 207 g ÷ 18.02 g/mol × 75.40 J/(mol⋅∘C) × (100 - 0) ∘C

= 174667.6 J

= 174.6676 kJ

Vaporizing water at 100°C:

q4 = n × ΔHvap

= m ÷ M × ΔHvap

= 207 g ÷ 18.02 g/mol × 40.67 kJ/mol

= 467.7326 kJ

Heating steam from 100°C to 125°C:

q5 = m × Cm(steam) × ΔT

= 207 g ÷ 18.02 g/mol × 36.04 J/(mol⋅∘C) × (125 - 100) ∘C

= 3832.8 J

= 3.8328 kJ

Total energy required:

qtotal = q1+q2+q3+q4+q5

= 41.3248 kJ + 56.804 kJ + 174.6676 kJ + 467.7326 kJ + 3.8328 kJ

= 744.3618 kJ.

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Answer:

Chemical Change

Explanation:

Chemical changes occur when bonds are broken and/or formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance with different properties.