Mixing solutions of iron(III) nitrate and sodium hydroxide precipitates the pigment iron(III) hydroxide. What mass of iron(III)
hydroxide is produced from 24.1 grams of sodium hydroxide?
Type the correct answer in the box. Express your answer to the correct number of significant figures C. Use the
periodic table to obtain the atomic masses of the elements.
The reaction will produce ___
grams of iron(III) hydroxide.​

Answer: Acetylene : -1,256 kJ/mol

Ethanol : -1,277 kJ/mol

Explanation:

The enthalpy of combustion of acetylene is -1299 kJ/mol and the enthalpy of combustion of ethanol is -1367 kJ/mol.

To calculate the enthalpy of combustion of each substance, we need to use the equation:

ΔHcombustion = ΣΔHf(products) - ΣΔHf(reactants)

Where ΔHcombustion is the enthalpy of combustion, ΣΔHf(products) is the sum of the enthalpies of formation of the products, and ΣΔHf(reactants) is the sum of the enthalpies of formation of the reactants.

Using the enthalpies of formation (AH) given in the table, we can calculate the enthalpy of combustion of each substance:

Acetylene:

C₂H₂ + (5/2)O₂ → 2CO₂ + H₂O

ΔHcombustion = [2(-393.5) + (-241.8)] - [228.8] = -1299 kJ/mol

Ethanol:

C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

ΔHcombustion = [2(-393.5) + 3(-241.8)] - [-235.1] = -1367 kJ/mol

Therefore, the enthalpy of combustion of acetylene is -1299 kJ/mol and the enthalpy of combustion of ethanol is -1367 kJ/mol.

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An example of an exothermic reaction is : C. oxidation of iron. The Exothermic process involves the liberation of heat.

An exothermic reaction is a chemical or physical reaction that gives heat. It takes out energy to its surroundings. The energy needed for the reaction to occur is less than the total energy released.

In the oxidation of iron, the heat is released while all the other processes are endothermic in which is heat is absorbed.

Thus, the correct option is C.

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Answer:

0.084 M

Explanation:

molar mass of Na3PO4 = 3*23 + 31 + 4*16 = 164 g/mol

moles of Na3PO4 = mass / molar mass = 0.46/164 = 0.0028 mol

There are 3 moles of Na+ in 1 mol of Na3PO4, so there are 3*0.0028 = 0.0084 moles of Na+ in the solution

Molarity is defined as:

M = moles of solute/litre of solution

100 ml are equivalent to 0.1 L

Therefore:

M of Na+ = 0.0084/0.1 = 0.084 M

Answer:

1.06M

Explanation:

Given parameters:

Mass of HBr  = 50g

Volume of water  = 600mL

unknown:

Molarity of the solution = ?

Solution:

The molarity of a substance is the number of moles of solute in a volume of solution.

   Mathematically;

             Molarity  = [tex]\frac{number of moles }{volume}[/tex]

Since the number of moles is unknown, let us solve for it;

         Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

               Molar mass of HBr  = 1 + 80  = 81g/mol

    Number of moles  = [tex]\frac{50}{81}[/tex]    = 0.64mole

Convert the volume to liters or dm³;  600mL  =  0.6L or 0.6 dm³

Input the parameters and solve;

            Molarity  = [tex]\frac{0.64}{0.6}[/tex]   = 1.06M

Answer:

There should be the refraction for light to change a material.

Answer: change in speed

Explanation: the change in speed causes light Ray's to change direction. This directional change is called refraction.

Answer:

The correct answer is 3.0 * 10^3 J.

Explanation:

To solve this problem, we must use the formula q = mcΔT, where q represents the heat energy measured in joules, m represents the mass measured in grams, c represents the specific heat measured in J/°C*g, and ΔT represents the change in temperature, measured in °C.

To solve this problem, we must first plug the given values into the equation.

q = mcΔT

q = (29.0 g)(4.184 J/°C*g)(25 °C)

Now, we must multiply the values together to get our final answer.

q = 3033.4 J

But, we must remember the rules of significant figures, which tell us that since the temperature only had 2 significant figures, the answer must have 2 significant figures as well.

Therefore, the answer is:

q = 3.0 * 10^3 J

Hope this helps!

Answer:

[tex]2.5\cdot 10^6 Hz[/tex]

Explanation:

The relationship between the speed of a wave, its frequency and its wavelength is given by the wave equation:

[tex]v=f\lambda[/tex]

where

v is the wave speed

f is the frequency of the wave, which is the number of cycles completed by the wave in one oscillation

[tex]\lambda[/tex] is the wavelength, which is the distance between two consecutive crests of the wave

For the wave in this problem we have:

v = 5000 m/s is the speed

[tex]\lambda=0.002 m[/tex] is the wavelength of the wave

Solving for f, we find the frequency:

[tex]f=\frac{v}{\lambda}=\frac{5000}{0.002}=2.5\cdot 10^6 Hz[/tex]

Answer: specie

Explanation:

A specie is the smallest group of organisms with similar characteristics and are capable of living with each other and breeding together freely. They give rise to young ones (offspring) that resembles the parents and can also breed with organisms of same species.

Examples of species include

- a group of lizards

- a group of human beings etc

A species is defined as a group of organisms that can mate

A species is a fundamental unit of biological classification. It comprises individuals that can interbreed and produce fertile offspring, sharing common characteristics. Species diversity is vital to biodiversity and plays a central role in ecology and evolutionary biology studies.

Thus, a species is a group of individual organisms that interbreed and produce fertile, viable offspring. According to this definition, one species is distinguished from another when, in nature, it is not possible for matings between individuals from each species to produce fertile offspring. This reproductive isolation is an important factor in defining species.

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Answer:atom

Explanation: electron cloud

Answer:

B

Explanation:

on edge

The second equation represents a fission reaction because a large atom splits into many smaller atoms along with  energy.

Fission reaction occurs when a larger atom split into two smaller atoms with the release of a tremendous amount of energy.

So we can conclude that the second equation represents a fission reaction because a large atom splits into many smaller atoms along with  energy.

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Answer:

is a mutiply choice answer just to be specific

Explanation:

Final answer:

Elements from the chalcogen group (group 16), which have six valence electrons, will combine with calcium in a 3:2 ratio to form a compound, such as calcium oxide ([tex]Ca_3O_2[/tex]).

Explanation:

The question asks which group of elements and how many valence electrons they have that would combine in a 3:2 ratio with calcium to form a compound. Calcium is an alkaline earth metal and has two valence electrons. It is located in group 2 of the periodic table. For elements to combine with calcium in a 3:2 ratio, we need to look for elements that will combine in such a way that three atoms of that element will bond with two atoms of calcium. This typically occurs with nonmetals from the chalcogen group (group 16), which have six valence electrons each.

For example, if we consider oxygen (O), which is a member of the chalcogen group, it can be seen that two calcium atoms (each providing two valence electrons for a total of four electrons) will combine with three oxygen atoms (each needing two electrons to complete its valence shell) to form calcium oxide ([tex]Ca_3O_2[/tex]) in a 3:2 ratio, utilizing all valence electrons involved in the bond formation.

Answer:

388.5

Explanation:

[tex] \frac{555}{32} = 17.34375 \\ 17.34375 \times 22.4 = 388.5 [/tex]

Answer:

A

Explanation

The product side is on the right, FeO + H2. H represents hydrogen, the number after it is the sbscript, which indicates that there are two hydrogen atoms.

There are two atoms of hydrogen  in the product side of the balanced chemical equation.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

3. Group

5. Valence electron

6. The atomic number tells you the presence of proton and electron.

Explanation:

The electrons which are present in the last shell or orbit is called valence electron and the shell is valance shell. When you go from left to the right side of the periodic table, number of shells remains the same but number of electron increases while when we go from top to bottom of periodic table, number of shell increases but the number of valance electrons remains the same.

Lighting the candle on a double-pan mechanical balance will cause the balance to tilt as the candle loses mass due to combustion, favoring the side with the unburned weights.

When a candle placed on one pan of a double-pan mechanical balance is lit, and an equal weight is on the other pan, the balance will be disrupted over time. As the candle burns, it loses mass primarily through the combustion process, which converts wax into gases like carbon dioxide and water vapor that are released into the air. As a result, the mass in the candle's pan decreases, causing the balance to tilt favoring the side with the unburned weights, typically metal cylinders of standard mass.

Answer:

b

Explanation:

Answer:

The pressure in the container is 1,7 atm.

Explanation:

We convert the unit of temperature in Celsius into Kelvin:

0°C= 273K --> 45°C= 45 + 273= 318 K

We use the formula:

PV=nRT ---> P =nRT/V

P= 1,20 mol x 0,082 l atm/K mol x 318 K/18,0 L

P= 1, 7384 atm

Answer:

2052

Explanation:

multiply the pressure value by 760

To convert atm to torr, we should know 1 atm equals 760 torrs then the conversion exists 2052 torr.

Torr and atm are the two main pressure units. To convert atm to torr, we should know 1 atm equals 760 torrs.

It exists the manometric pressure unit. It exists described as, the pressure exerted by column of mercury one millimeter high it exists represented by mmHg.

Torr to mmHg conversion:

Both exists equivalent to each other.

1 torr = 1 mmHg

Torr to atm:

Torr exists converted into atm by dividing the torr value 760.

mmHg to atm.

mmHg exists converted into atm by dividing the torr value 760.

Kilopascal:

The kilopascal exists the unit of pressure. It exists denoted by KPa.

Given:

2.70 atm

The conversion exists given by,

1 atm = 760 torr

2.70 atm = 760 × 2.70 torr

= 2052 torr

Therefore, the correct answer is 2052 torr.

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Answer:

ye

Explanation:

help

Answer:

1 atom sulfur

Explanation:

1 molecule sulforous acid = SO2 Thus, 1 atom sulfur and 2 atoms O

To determine the number of moles of glucosamine in a 1,000 mg dose, first calculate the molar mass of glucosamine (C6H13NO5), which is approximately 179.17 g/mol. Then convert the dose to grams (1,000 mg equals 1 g) and divide by the molar mass to find that the patient takes 0.00559 moles of glucosamine per day.

To calculate how many moles of glucosamine a patient takes each day when prescribed 1,000 mg of glucosamine, we need to first determine the molar mass of glucosamine. Glucosamine has a chemical formula of C6H13NO5, so we will sum the atomic masses of its constituent elements: Carbon (C), Hydrogen (H), Nitrogen (N), and Oxygen (O). The molar mass of one mole of glucosamine can be found by adding the molar masses of 6 carbons (≈13.01 g/mol), 13 hydrogens (≈1.01 g/mol), one nitrogen (≈14.01 g/mol), and five oxygens (≈16.00 g/mol), which equals approximately 179.17 g/mol. Next, we convert the prescribed dose from milligrams to grams: 1,000 mg = 1 g. Lastly, we divide the mass of glucosamine in grams by its molar mass in grams per mole to calculate the number of moles.

1 g / 179.17 g/mol = 0.00559 moles (or 5.59×10⁻³ moles), which is the amount of glucosamine the patient takes each day.

Well, the big bang theory was that the universe started to expand at and extrmly fast rate. We're talking several billion kilometers in less than a second.  People think that our univers was pretty much shot out into space in a ciertain direction. During this, the univers has expanded and widen't to unimaginable size. but we really don't know what happend, and we may never find out. Who knows?

According to the traditional Big Bang theory, the universe's creation involved a singularity, a region of infinite density and temperature whose nature is difficult for humans to comprehend.

A physics theory called the Big Bang event explains how the cosmos grew from a highly dense and hot starting condition. The evolution of the observable universe from the earliest known times through its succeeding large-scale form is explained by several cosmological models of the Big Bang.

Everything in the cosmos was compressed into a singularity, a point of infinite heat and density, around 13.7 billion years ago. Our cosmos suddenly began to expand explosively, expanding faster than the speed of light.

Belgian Catholic priest, theoretical physicist, mathematician, astronomer, and professor of physics Georges Lemaître is credited with developing the theory itself. The notion was initially supported by Hubble's Law of the universe's expansion.

Thus, in the traditional Big Bang theory, the universe's creation involved a singularity.

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Final answer:

Balancing the provided chemical equation for the combustion of ethane results in a balanced equation with integer-only coefficients: 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O, showcasing the adherence to the law of conservation of mass.

Explanation:

The question involves balancing a chemical equation which is a fundamental skill in chemistry. The correct and balanced equation for the combustion of ethane (C2H6) in oxygen is as follows:

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

This equation demonstrates that when ethane (C2H6) combusts with oxygen (O2), it produces carbon dioxide (CO2) and water (H2O). Balancing a chemical equation ensures that there are an equal number of atoms for each element on both sides of the equation, adhering to the law of conservation of mass. This equation is balanced by ensuring there are equal numbers of carbon, hydrogen, and oxygen atoms on both reactant and product sides. After initial attempts that might lead to fractional coefficients, multiplying all coefficients by an appropriate factor to achieve integer-only coefficients is a commonly used strategy as illustrated by the multiplication of each coefficient by 2 in this case.

Answer:

There are 2, 01 moles of helium in the container

Explanation:

We use the formula PV=nRT. We convert of pressure the unit kPa into atm:

101,325 kPa---1 atm

245   kPa   ----x= (245  kPa x 1 atm)/101,325 kPa=2,42 atm

PV= nRT  --->  n=PV/RT

n= 2, 42 atm x 21, 5 L/ 0,082 l atm /K mol  x315K

n=2, 012620871 mol

Answer:

202 KPa

Explanation:

Step 1:

Data obtained from the question.

Initial Pressure (P1) = 220 kPa

Initial temperature (T1) = 26.7°C

Final temperature (T2) = 2.2°C

Final pressure (P2) =?

Step 2:

Conversion of the Celsius temperature to Kelvin temperature.

Temperature (Kelvin) = temperature (celsius) + 273

T1 = 26.7°C + 273 = 299.7 K

T2 = 2.2°C = 2.2°C + 273 = 275.2 K

Step 3:

Determination of the new pressure.

The new pressure of the tire can be obtained as follow:

P1/T1 = P2/T2

220/299.7 = P2/275.2

Cross multiply to express in linear form

299.7 x P2 = 220 x 275.2

Divide both side by 299.7

P2 = (220 x 275.2)/299.7

P2 = 202 KPa

Therefore, the new pressure of the tire is 202 KPa

When the temperature drops to 2.2 degrees Celsius, the tire pressure will decrease to approximately 202.1 kPa.

We can use the combined gas law which is derived from the ideal gas law. The combined gas law relates pressure, volume, and temperature without needing to know the quantity of gas, and is expressed as (P₁/T₁) = (P₂/T₂), where P₁ and T₁ are the initial pressure and temperature, and P₂ and T₂ are the final pressure and temperature.

To do so, we first convert temperatures to Kelvin by adding 273.15. Then we rearrange the formula to solve for P₂:

Therefore, the tire pressure will decrease to approximately 202.1 kPa.

Answer:

0.016M

Explanation:

First we find the mole of AgNO3 by using the formula mass/molar mass..

Then we find molarity by the formula mole/volume...

I hope you get this..

Answer: 13.31 moles.

Explanation: So take 452 grams of Argon and multiply by the molar mass of Argon. Your units will cancel out, leaving you with moles of Argon.

Answer:

the answer the gravity

Explanation:

Answer:

The concentrations of the products and reactants do not change.

Explanation:

The following information is missing:

If the reaction is at dynamic equilibrium at 500 K, which statement applies to the given chemical system?

Dynamic equilibrium means that the rate of the forward and reverse reactions are equal and different from zero. Then, the concentrations of the products and reactants do not change.

Answer:

c

Explanation: