calculate the mass of water vapor produced when 6.00 L of propane gas undergone complete combustion at a temperature of 250 celsius and a pressure of 1.00 atm

Answer:

There is no friction because of the mass.

Explanation:

The bigger box ran out of force to move so it hit the smaller box. (im in 7th grade and have the answer key)

Answer:

More air pollution because there are fewer trees to take in carbon dioxide

Fewer birds and other wildlife because they have fewer places to live

Explanation:

I took the test on APEX

Answer:

will go do that.

Explanation:

Answer:   " 4, 1, 2, 3."

_______________
  " In molecules, C, H, O, and N atoms  usually make _4_, _1_, _2_, and  

_3_ bonds, respectively."
_______________
Note the following mnemonic device:

" H O N C " —>  "Honc" if you love molecules!"

  1   2  3  4 ;

{"hydrogen"} H → 1

{"oxygen"} O  → 2

{"nitrogen"} N → 3

{"carbon"} C → 4

___

So:  by using this mnemonic:
H  O  N  C ;

1   2   3   4 ;
___
→ We can answer the question:
" C, H, O,  N " → in sequence:
" 4,  1,  2,  3 " ;

{just use the corresponding numbers as per the mnemonic device.}.
The answer:  " 4, 1, 2, 3 ".

Hope this is helpful to you!  Best wishes!

Answer:

Table price is 100 dolar

Explanation:

Because the table is to expensive to buy in low price

Answer:

zn +2Agno3= Zn(No3)2 +2Ag

Answer:

iris is what controls the amount of light  that enters the eye

Explanation:

Answer:

Iris

Explanation:

The Iris opens and closes to control the amount of light entering the eye through the pupil.

The sawtooth pattern observed in the two-year chart of carbon dioxide measurements from Mauna Loa, Hawaii, is a result of seasonal variations and human activities.

Carbon dioxide levels increase during the winter months when plants are dormant and decrease during the summer months when they are actively photosynthesizing. Additionally, human activities such as burning fossil fuels and deforestation contribute to the overall increase in carbon dioxide levels. The sawtooth pattern provides valuable data for scientists studying the impacts of climate change and global warming. It also serves as a reminder of the urgent need to reduce carbon emissions and adopt sustainable practices to mitigate the effects of climate change.

The sawtooth pattern observed in the two-year chart of carbon dioxide (CO2) measurements from Mauna Loa, Hawaii, is primarily due to seasonal fluctuations in plant growth and decay. During spring and summer, increased photosynthesis in the Northern Hemisphere absorbs CO2 from the atmosphere, causing a decrease in CO2 levels. Conversely, during fall and winter, reduced photosynthesis and increased plant decay release CO2 back into the atmosphere, resulting in a rise in CO2 levels. This cyclical pattern creates the sawtooth appearance on the chart, while the overall trend still shows a continuous increase in atmospheric CO2 levels due to human activities.

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Answer: 27

Explanation:

3*3*3

you take l*w*h (3*3*3)

Answer: The value of \(\Delta H\) is -163 kJZ

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\) ......(1)

We are given:

Given mass of water = 72.0 g

Molar mass of water = 18 g/mol

Putting values in equation 1, we get:

\(\text{Moles of water}=\frac{72.0g}{18g/mol}\\\\\text{Moles of water}=4mol\)

Calculating the heat released for the condensation process:

\(\Delta H=n\times \Delta H_{(vap)}\) ......(2)

where,

\(\Delta H\) = amount of heat released

n = number of moles of water = 4 moles

\(\Delta H_{(vap)}\) = specific heat of vaporization = -40.7 kJ/mol

Negative sign represents the amount of heat released.

Putting values in equation 2:

\(\Delta H=4mol\times (-40.7kJ/mol)=-163kJ\)

Hence, the value of \(\Delta H\) is -163 kJ

Answer:

Examples of calcium channel blockers include:

Amlodipine (Norvasc)

Diltiazem (Cardizem, Tiazac, others)

Felodipine.

Isradipine.

Nicardipine.

Nifedipine (Procardia)

Nisoldipine (Sular)

Verapamil (Calan SR, Verelan)

When using the Bindex software, it's essential to set the units for height and weight to "US" instead of metric. This will ensure that the measurements are displayed in feet and inches for height and pounds for weight, which is the preferred format in the United States.

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Answer:

i thank its 4)

Explanation:

becuse if they have reactino or no reatino will it 4) becuse i did this

Answer:

Use of Chemical Symbols

One of the main reasons this was developed was because using letters was the easiest way to represent the elements. Another reason that we use chemical symbols is to allow us to write chemical formulas easily.

When any chemical equation is not balanced then that is known as skeletal chemical equation. We need to balance it because as we know that mass can neither be created nor be distroyed and also the number of atoms on the reactant side should always be equal to the compounds on the product side .

To make a 50.0 mL solution of 1.7 M sodium carbonate (Na₂CO3), we need to determine the mass of Na₂CO3 required.

To calculate the mass of Na₂CO3 needed, we can use the formula:

Mass = Concentration x Volume x Molar Mass

First, we convert the given volume from milliliters to liters:

Volume = 50.0 mL = 50.0/1000 L = 0.05 L

Next, we substitute the given concentration and volume values into the formula:

Mass = 1.7 M x 0.05 L x Molar Mass of Na₂CO3

The molar mass of Na₂CO3 can be calculated by adding the atomic masses of sodium (Na), carbon (C), and three oxygen (O) atoms:

Molar Mass of Na₂CO3 = (2 x Atomic Mass of Na) + Atomic Mass of C + (3 x Atomic Mass of O)

After obtaining the molar mass value, we can substitute it into the formula and perform the calculation to determine the mass of Na₂CO3 required to make the 50.0 mL solution of 1.7 M sodium carbonate.

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ANSWER

The mass of water is 0.0536 kg

STEP-BY-STEP EXPLANATION;

Given information

The mass of KNO3 = 175g

The molarity of the solution = 32.25 M

The molality formula is given below as

The first step is to find the mole of the solute using the below formula

Recall, the molar mass of KNO3 is 101.1032 g/mol

The second step is to find the mass of water using the molality formula

Hence, the mass of water is 0.0536 kg

Internal energy of the system is 1278 kJ.

What is Internal Energy?

It refers to the intangible microscopic energy at the atomic and molecular scales, which is distinct in scale from the macroscopic organised energy associated with moving objects. For instance, a glass of water on a table at room temperature appears to have no apparent energy, either potential or kinetic.

∆U = w + q

U = modification of internal energy =?

W = work equals +425 kcal (positive sign because work is done on the system)

lthough I'm not sure you intended to use separate units (kcal and kJ), I'll presume you did so in order to solve the problem. Don't convert them if they should be the same, such as in the case of kJ.

425 kcal plus 4.184 kJ per kcal equals 1778 kJ of labor, or w.

∆U = +1778 + (-500 kJ) (-500 kJ)

∆U = +1278 kJ

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Given that the volume remains constant, the sample of oxygen gas will have a pressure of 10.67 kPa at a temperature of -62.0°C, according to the question.

The force per unit area applied to a surface is described by the fundamental physical quantity known as pressure. It is quantified in units of force like pounds per square inch (psi) or newtons per square metre (N/\(m^2\)). In addition to measuring the amount of force delivered to an area, pressure can also be used to gauge how much work a system has accomplished.

Because a gas sample's pressure and temperature are inversely correlated, when the temperature varies, so does the gas pressure. The Ideal Gas Law, which states that P*V = n*R*T, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature, describes the relationship between pressure and temperature for a certain volume of gas.

As a result, we may modify the Ideal Gas Law equation to solve for P in order to determine the pressure at -62.0°C:

P = (n*R*T) / V

P = (n*R*(-62.0 + 273.15)) / V

P = (n*R*211.15) / V

P = (6.58 kPa * 8.314 J/K·mol * 211.15 K) / V

P = 10.67 kPa

Given that the volume remains constant, the pressure of the sample of oxygen gas will be 10.67 kPa at -62.0°C.

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The mass of (NH4) 2S in the solution is : Mass = 0.0600 mol × 60.08 g/mol = 3.60 g.

The given molarity and volume of the solution can be used to calculate the number of moles of ammonium sulfide (NH4)2S.Then, the number of moles can be converted to mass using the molar mass of (NH4)2S.Mass of ammonium sulfide (NH4)2S in 3.00 L of a 0.0200 M solution is given by : Mass = moles × molar mass.The number of moles of (NH4)2S can be found using the equation:Molarity = Number of moles / Volume.Rearranging this equation, we get:Number of moles = Molarity × Volume Number of moles of (NH4)2S = 0.0200 M × 3.00 L.Number of moles of (NH4)2S = 0.0600 mol.The molar mass of (NH4)2S can be calculated by summing the molar masses of ammonium (NH4) and sulfide (S) ions.Molar mass of (NH4)2S = (2 × Molar mass of NH4) + Molar mass of S= (2 × 14.01 g/mol) + 32.06 g/mol= 60.08 g/mol.

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If a flammable substance in a beaker should catch fire while you are working but the flames are relatively contained, the simple method for extinguishing the flame is to cover the beaker with a watch glass or a larger beaker.

By doing so, the oxygen supply to the fire is cut off and the flame will extinguish.

Fire is a complex chemical process that occurs when a substance reacts with oxygen and releases heat and light in the form of flames. In laboratories, fires can occur due to various reasons such as faulty electrical connections, misuse of heating equipment, or the presence of flammable materials.

A flammable substance is a material that ignites easily and burns rapidly in the presence of a spark or open flame. Common examples of flammable substances found in laboratories include solvents, alcohols, and fuels.

A watch glass is a circular, slightly convex-shaped piece of glass used in laboratories to cover beakers or as a surface for evaporating small amounts of liquid. It is also used to hold solids when being weighed. It is relatively lightweight and can withstand high temperatures.

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Explanation:

Mass ratio C : H : N = 27.3 : 9.10 : 63.6

Mole ratio C : H : N = 27.3/12: 9.10/1 : 63.6/14

( Divide the mass ratio by their molar masses to find the ratio between moles)

Mole ratio = 2.275 : 9.10 : 4.54

= 2.275/2.275 : 9.10/2.275 : 4.54/2.275

= 1 : 4 : 2

Answer is CH4N2

The empirical formula of a compound is \(CH_4N_2\)

The empirical formula of a chemical compound is defined as the simplest whole number ratio of the atoms present in a compound.

The empirical formula of a compound defines the simplest ratio of the number of different atoms present. The molecular formula gives the actual number of each different atom present in a molecule. The molecular formula is mainly used which is a multiple of the empirical formula.

Molecular Formula  = n × Empirical Formula

For above given example,

Mass ratio C : H : N = 27.3 : 9.10 : 63.6

Mole ratio C : H : N = 27.3/12: 9.10/1 : 63.6/14

( We divide the mass ratio by their molar masses to find the ratio between moles)

Mole ratio = 2.275 : 9.10 : 4.54 = 2.275/2.275 : 9.10/2.275 : 4.54/2.275

= 1 : 4 : 2

Thus, the empirical formula of a compound is \(CH_4N_2\)

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It is generally safe to rinse your mouth with hydrogen peroxide. Hydrogen peroxide has been used as a mouth rinse for many years and is available in many over-the-counter products.

It is often used to treat bad breath, gum disease, and oral infections. When used as a mouth rinse, hydrogen peroxide helps to reduce the amount of bacteria in the mouth. It also helps to break down plaque and tartar, which can lead to cavities and gum disease. Rinsing with hydrogen peroxide can also help to whiten teeth, as it is able to break down certain types of stains. However, it is important to use hydrogen peroxide safely. It should be used in a diluted form (usually three percent) and should be rinsed with water afterwards. It should not be swallowed, as it can cause nausea, vomiting, and diarrhea. Additionally, using hydrogen peroxide too often can damage the enamel of the teeth. Overall, it is generally safe to rinse your mouth with hydrogen peroxide, but it is important to do so in a diluted form and follow up with a water rinse.

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Answer:

burning is a rapid process, rustig is a slow process. burning releases light during the process,rusting does not. burning can speed up with addition of more external conditions, rusting cannot be sped up greately by addition of external materials. burning results in release of large amts of heat, rusting very little amt of heat

Hope helped

plesse give a thank

and most brainlest

-Rust happens when something is unpolished and is old. Burning has been modified by heat.

-Burning is a chemical change. Rust is a physical change.

-Burning something cannot be fixed back to its natural form, while when something is rusted it can possibly be re-used and fixed.

-The texture of something burnt is usually fragile and brittle while rust makes (metal for example) gritty.

-Rust usually forms solely on metals while almost anything can be burned.

note: you asked for 4 answers but i gave you 5 in case you didnt like any of them. Hope this helps!

The base-dissociation constant (Kb) for the unknown anion a- is 2.19 x 10^-12. The relationship between acid-dissociation constant (Ka) and base-dissociation constant (Kb).

Substituting the value of Ka into the above equation:Ka x Kb = Kw4.57 x 10^-3 x Kb = 1.0 x 10^-14Kb = 1.0 x 10^-14 / 4.57 x 10^-3Kb = 2.19 x 10^-12Long answerThe acid-dissociation constant (Ka) is a measure of the strength of an acid. It is defined as the equilibrium constant for the dissociation reaction of an acid into its conjugate base and a hydrogen ion (H+).

The base-dissociation constant (Kb) is a measure of the strength of a base. It is defined as the equilibrium constant for the dissociation reaction of a base into its conjugate acid and a hydroxide ion (OH-).The relationship between Ka and Kb is given by the following equation:Ka x Kb = Kwwhere Kw is the ion product constant of water and has a value of 1.0 x 10^-14 at 25°C.If we know the value of Ka for an acid, we can use the above equation to calculate the value of Kb for its conjugate base.

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Answer:

The more optically dense that a material is, the slower that a wave will move through the material. ... So as the index of refraction value increases, the optical density increases, and the speed of light in that material decreases.

The reaction rate with mass of the tablet being 1000 mg and volume of water 0.200 L is

(i) If Reaction time is 34.5 sec – 145 mg / L / sec is the reaction rate

(ii) If Reaction time is 28.9 sec – 173 mg / L / sec is the reaction rate

(iii) If Reaction time is 23.1 sec – 216 mg / L / sec is the reaction rate

Given that, Mass of tablet = 1000 mg

                  Volume of water = 0.200 L

We need to find the reaction rate

We know that, Reaction rate =  \(\frac{mass of tablet / volume of water}{reaction time}\)

(i) Reaction rate if reaction time is 34.5 sec = \(\frac{1000 / 0.200}{34.5}\) = 145 mg / L / sec

(ii) Reaction rate if reaction time is 28.9 sec = \(\frac{1000/0.200}{28.9}\) = 173 mg / L / sec

(iii) Reaction rate if reaction time is 23.1 sec = \(\frac{1000/0.200}{23.1}\) = 216 mg / L / sec

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