how many molecules of propane are in 22.0 g c3h8 the molar mass of propane is about 44 g/mol

To calculate the energy needed to melt 750 grams of gold, we need to consider the heat required to raise the temperature of the gold from 24 °C to its melting point and then the heat of fusion to convert it from solid to liquid.

Given:
Mass of gold = 750 grams
Specific heat of gold = 0.128 kJ/kg °C
Melting point of gold = 1,063 °C
Heat of fusion of gold = 66.6 kJ/kg
First, let's calculate the energy needed to raise the temperature of the gold from 24 °C to its melting point:
Q1 = mcΔT
Q1 = (750 g)(0.128 kJ/kg °C)(1,063 °C - 24 °C)
Next, let's calculate the energy needed to convert the gold from solid to liquid:
Q2 = mΔHf
Q2 = (750 g)(66.6 kJ/kg)
Finally, let's calculate the total energy required:
Total energy = Q1 + Q2
Therefore, the energy needed to melt 750 grams of gold starting at 24 °C is:
Total energy = Q1 + Q2
Total energy = [(750 g)(0.128 kJ/kg °C)(1,063 °C - 24 °C)] + [(750 g)(66.6 kJ/kg)]
Note: Make sure to convert the mass from grams to kilograms before performing the calculations.
Total energy ≈ 84,704.64 kJ
Rounded to the nearest kilojoule (kJ), the energy needed to melt 750 grams of gold starting at 24 °C is approximately 84,705 kJ.

To know more about melting point, click here https://brainly.com/question/25777663

#SPJ11

Among the given reactions, the reaction involving NH4+ and H2O would occur to a measurable extent in water. The other reactions involving Cl-, F-, and Br- ions do not result in significant reaction in water.

In water, the dissociation of certain substances into ions can occur, leading to the formation of new compounds. This process is essential for reactions to take place in an aqueous solution. Let's analyze each of the given reactions:

   NH4+(aq) + H2O(l) ---> NH3(aq) + H3O+(aq):

   This reaction involves the ammonium ion (NH4+) and water (H2O). It leads to the formation of ammonia (NH3) and hydronium ions (H3O+). Since both NH4+ and H2O are capable of dissociating in water, this reaction can occur to a measurable extent.

   Cl-(aq) + H2O(l) ---> HCl(aq) + OH-(aq):

   This reaction involves the chloride ion (Cl-) and water (H2O). It suggests the formation of hydrochloric acid (HCl) and hydroxide ions (OH-). However, chloride ions (Cl-) and water (H2O) do not undergo significant dissociation in water, making this reaction less likely to occur to a measurable extent.

   F-(aq) + H2O(l) ---> HBr(aq) + OH-(aq):

   This reaction involves the fluoride ion (F-) and water (H2O), leading to the formation of hydrobromic acid (HBr) and hydroxide ions (OH-). Similar to the previous case, fluoride ions (F-) and water (H2O) do not extensively dissociate in water, making this reaction less likely to occur to a measurable extent.

   Br-(aq) + H2O(l) ---> HBr(aq) + OH-(aq):

   This reaction involves the bromide ion (Br-) and water (H2O). It suggests the formation of hydrobromic acid (HBr) and hydroxide ions (OH-). Like the previous cases, bromide ions (Br-) and water (H2O) do not exhibit significant dissociation in water, indicating that this reaction would not occur to a measurable extent.

To learn more about reaction - brainly.com/question/14377332

#spj11

Answer: balance, posture, & coordination

Explanation:

Elthalpy change is the heat absorbed by water for the iron placed in water is 3072.3 Joules.

A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state function that is frequently employed in measurements of chemical, biological, and physical systems under constant pressure, which the large surrounding environment readily provides.

The amount of heat released or absorbed during a reaction that takes place under constant pressure is referred to as the enthalpy change. It has the sign H, which may be interpreted as "delta H."

The initial tempareture of the water is 21°C

Final temperature of the water is 28°C

Change in temperature is 28 - 21 = 7°C

Elthalpy change is the heat absorbed by water for the iron placed in water is 4.18*105*7 = 3072.3 Joules.

To learn more about Enthalpy refer to :

https://brainly.com/question/27565372

#SPJ1

Answer: There is no list in your question. But the three factors in which natural selection occurs are:

1. A struggle for existence,

2. Variation and

3. Inheritance

Explanation:

Darwin’s theory of natural selection is the way in which organisms change overtime.

These changes allow organisms to become better adapted to their environment and increase their chances for survival.

The three major factors through which natural selection occurs are:

1. A struggle for existence,

2. Variation and

3. Inheritance

Darwin’s theory of natural selection will occur if the three conditions above are met and unless these factors are in place, natural selection will not occur.

Answer:

Potential energy to kinectic energy

Explanation:

          A device sprays coating material (paint, ink, varnish, etc.) through the air onto a surface when using the spray painting technique. The most popular varieties atomize and guide the paint particles using compressed gas, often air.

        Volatile Organic Compounds are present in a large number of commonly used professional spray paints (VOCs). VOCs are a group of compounds that are released as gases from a range of solids and liquids, some of which may be harmful to human health in the short- and long-term.

        When a valve button is depressed, aerosol paint, also known as spray paint, is released from a sealed, pressurized container in an aerosol spray. One type of spray painting is aerosol painting, which leaves a smooth, even coat in contrast to many conventional rolled and brushed paints.

         Not every change in color results from a chemical shift. If one were to alter a substance's color through a non-chemical interaction, such as painting an automobile, the alteration would be physical rather than chemical.

        Spray paints come in aerosol cans and are liquid paints. The top of a can  of spray paint has a button that, when depressed, releases paint. Compressed gas is used in aerosol spray cans as a liquid propellant.

          A million times faster than brush-on paint is spray paint. Since spray paint is often oil based rather than water based, it is more durable than conventional latex paint or spray paint. Using spray paint outside is simple when you have a drop cloth and some newspaper handy.

To Learn more About Spray paint, Refer:

https://brainly.com/question/23431983

#SPJ13

Answer:

I think it is b 50%

Answer

Explanation

In the Lewis Dot structure, S = N - A is used to calculate the total number of shared and unshared electrons in a molecule.

S represents the TOTAL number of valence shared electrons in a molecule to achieve an octet, N represents the sum of the number of valence electrons of all the atoms of the molecule, and A is the number of valence electrons in an electron pot.

For SiCl₄, the valence electron on each atom coming together to form the molecule is:

Valence electron on Si = 4

Valence Electron on Cl = 7

Total valence electron on SiCl₄ = 4 + (4 x 7) = 32

The least electronegative Si atom is placed at the center, and four Cl atoms are connected with a single bond.

A single bond takes up 2 valence electrons, so for four bonds, 8 valence electrons have been occupied, and we are left with 32 - 8 = 24 valence electrons.

Thus, in the Lewis Dot structure S = N - A , the TOTAL number of valence electrons in a molecule to achieve an octet of SiCl₄ to achieve an octet is

1= b. electrons are lost

2= a. after one substance is oxidized

Answer:

The velocity of the bb when it reaches a height of 203 m can be determined using the laws of projectile motion. Since the bb is moving vertically upwards, its velocity at that height will be zero.

brainlest?

Answer: v = 83.96 m/s

Assuming the acceleration due to gravity is approximately 9.8 m/s^2, we can use the principles of projectile motion and energy conservation.

Using the equation for the vertical displacement of an object in free fall:

Δy = (v₀² - v²) / (2g)

Δy = vertical displacement (203m)

v₀ = initial velocity (105 m/s)

v = final velocity (not known yet)

g = accerlation due to gravity (9.8 m/s^2)

Lets rearrange the equation to solve for the final velocity:

v = v = √(v₀² - 2gΔy)

Substituting the given values:

v = √(105² - 2 * 9.8 * 203)

v ≈ √(11025 - 3979.6)

v ≈ √(7054.4)

v ≈ 83.96 m/s

Therefore, when the BB pellet is at the height of 203m, its velocity will be approximately 83.96 m/s.

If there was a high concentration of acetylcholine within the synaptic cleft, but little to no response at the motor end-plate, you would expect curare to be the responsible neuromuscular-blocking agent.

Curare is a paralyzing agent that causes weakness in the skeletal muscles. When taken in a sufficient dose, it can also cause death by asphyxiation because the diaphragm is paralyzed. Curare poisoning can be indicated by paralysis. It doesn't tend to alter the state of consciousness, but since every voluntarily controlled muscle in the body is paralyzed, the person suffering from curare poisoning can't confirm their consciousness. From the outside, curare poisoning looks very similar to the locked-in syndrome.

Learn more about curare at https://brainly.com/question/12985383

#SPJ4

Answer:

pooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooop

Explanation: fart

i'm not sure, so sorryyy!

Answer: Raw meat, poultry and seafood. Feces may get onto raw meat and poultry during the butchering process. ...

Raw eggs. ...

Fruits and vegetables.

Explanation:

Answer:

Nuclear fusion of hydrogen to form helium occurs naturally in the sun and other stars. It takes place only at extremely high temperatures. That's because a great deal of energy is needed to overcome the force of repulsion between the positively charged nuclei.

Explanation:

hope it helps

The mass of water (H₂O) needed to meet the oxygen demand is 191587.5 g

2H₂ + O₂ —> 2H₂O

Molar mass of O₂ = 16 × 2 = 32 g/mol

Mass of  O₂ from the balanced equation = 1 × 32 = 32 g

Molar mass of H₂O = (2×1) + 16 = 18 g/mol

Mass of H₂O from the balanced equation = 2 × 18 = 36 g

SUMMARY

From the balanced equation above,

32 g of O₂ reacted to produce 36 g of H₂O

From the balanced equation above,

32 g of O₂ reacted to produce 36 g of H₂O

170300 g of O₂ will react to produce = (170300 × 36) / 32 = 191587.5 g of H₂O

Thus, 191587.5 g of H₂O is needed to meet the oxygen demand

Learn more about stoichiometry:

https://brainly.com/question/14735801

a. 0.6 moles

b. 35.1 grams

Given

Volume = 0.2 L

Molarity = 3 M

Required

mol of Sodium chloride

Solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

\(\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}\)

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

Input the value :

n = M x V

n = 3 M x 0.2 L

n = 0.6 moles

Mass of NaCl :

= mol x molar mass of NaCl

= 0.6 x 58.5 g/mol

= 35.1 grams

The p-value is greater than the significance level of 0.05, we do not reject the null hypothesis and conclude that all proportions are equal.

Firstly, let us conduct a Chi-square test of independence of categorical variables based on the information given above. We have three different cases of hypothesis testing that we have to solve one by one.

Case 1: HD​:pSun ​=rhoMan ​=pTue ​=pWed ​=pThu ​=pFri ​=pSat ​=71​
Ha​ : Not all proportions are equal.

Test Statistic
For this hypothesis, we need to compute the test statistic that is given as:
\($$\chi^2=\sum_{i=1}^{k}\frac{(O_i-E_i)^2}{E_i}$$\)  where k is the number of groups/categories. Since we have 7 days of the week, \(k = 7. $O_i$ and $E_i$\) are the observed and expected frequencies respectively.  
Here, we have equal proportions of 71 for each day of the week.
Therefore, the expected frequencies are also equal to 71.
\($$E_i = 71, i=1,2,3,4,5,6,7.$$\)

We also have to use the given information to compute the observed frequencies,
\($O_i$.$$O_1 = 90, O_2 = 99, O_3 = 122, O_4 = 123, O_5 = 130, O_6 = 160, O_7 = 126$$\)

Therefore, the test statistic can be computed as \($$\chi^2=\frac{(90-71)^2}{71} + \frac{(99-71)^2}{71} + \frac{(122-71)^2}{71} + \frac{(123-71)^2}{71} + \frac{(130-71)^2}{71} + \frac{(160-71)^2}{71} + \frac{(126-71)^2}{71}$$$$\chi^2=180.14\)

Now we have to find the p-value of this test. Since the number of degrees of freedom is k - 1 = 7 - 1 = 6, the p-value can be found using the chi-square distribution table with 6 degrees of freedom at the 0.05 significance level. The p-value is 0.000014. ConclusionSince the p-value is less than the significance level of 0.05, we reject the null hypothesis and conclude that not all proportions are equal.

The total number of accidents is \($$90+99+122+123+130+160+126=850$$\)

The percentage of accidents occurring on each day of the week can be found as follows:
\($$Sunday: $$\frac{90}{850}\times 100 = 10.59\%$$Monday: $$\frac{99}{850}\times 100 = 11.65\%$$Tuesday: $$\frac{122}{850}\times 100 = 14.35\%$$Wednesday: $$\frac{123}{850}\times 100 = 14.47\%$$Thursday: $$\frac{130}{850}\times 100 = 15.29\%$$Friday: $$\frac{160}{850}\times 100 = 18.82\%$$Saturday: $$\frac{126}{850}\times 100 = 14.82\%$$\)

From the above percentages, we can see that Friday has the highest percentage of traffic accidents.

Case 2:
HD​: Not all proportions are equal.

Ha​:pSun ​=pMon ​=pTue ​=rhoWed ​=pThu ​=rhoFri ​=rhoSat ​=71

Test Statistic

\($$E_1 = 78.57, E_2 = 86.57, E_3 = 106.86, E_4 = 107.43, E_5 = 113.57, E_6 = 139.43, E_7 = 109.14$$\)

We already know the observed frequencies,
\($$O_1 = 90, O_2 = 99, O_3 = 122, O_4 = 123, O_5 = 130, O_6 = 160, O_7 = 126.$$\)

The test statistic can be computed as:

\($$\chi^2=\frac{(90-78.57)^2}{78.57} + \frac{(99-86.57)^2}{86.57} + \frac{(122-106.86)^2}{106.86}+ \frac{(123-107.43)^2}{107.43} + \frac{(130-113.57)^2}{113.57} + \frac{(160-139.43)^2}{139.43} + \frac{(126-109.14)^2}{109.14} $$$$ \implies \chi^2=34.98$$\)
The p-value is 0.000001.
Conclusion- Since the p-value is less than the significance level of 0.05, we reject the null hypothesis and conclude that not all proportions are equal.

Case 3:

All proportions are equal.
Test Statistic
The expected frequency for each group is
\(E = \frac{850}{7} = 121.43\)
We already know the observed frequencies,
\($$O_1 = 90, O_2 = 99, O_3 = 122, O_4 = 123, O_5 = 130, O_6 = 160, O_7 = 126.$$\)

The test statistic is,

\($$\chi^2=\frac{(90-121.43)^2}{121.43} + \frac{(99-121.43)^2}{121.43} + \frac{(122-121.43)^2}{121.43} + \frac{(123-121.43)^2}{121.43} + \frac{(130-121.43)^2}{121.43} + \frac{(160-121.43)^2}{121.43} + \frac{(126-121.43)^2}{121.43}} \\\implies \chi^2=9.17$$\)

The p-value is 0.1664.

Since the p-value is greater than the significance level of 0.05, we do not reject the null hypothesis and conclude that all proportions are equal.

To know more about p-value visit:

https://brainly.com/question/30761573

#SPJ11

The one that best describes the regioselectivity and stereospecificity in the Bronsted acid-catalyzed addition of water to an alkene reaction is Markovnikov orientation with syn-addition. Hence option A.

The preference of E and Y for bonds with carbon atoms an or b is referred to as the Markovnikov orientation. The example below demonstrates how, depending on the reaction conditions, a proton acid HY can add to the -bond of an unsymmetrical alkene with either a Markovnikov or an anti-Markovnikov orientation.

When hydrogen itself forms a double bond with the least-substituted carbon atom in asymmetrical alkenes or alkynes, the Markownikoff or Markovnikov rule determines the orientation of the electrophilic addition of hydrogen halides. (or triple bond). So, as conculsion, option A is correct.

To know more about Markonikov orientation, visit,

https://brainly.com/question/21496002

#SPJ4

Complete question - which of the following describes correctly about the regioselectivity and stereospecificity in the bronsted acid-catalyzed addition of water to an alkene reaction?

Group of answer choices

1. markovnikov orientation with syn-addition

2. markovnikov orientation with anti-addition

3. anti-markovnikov orientation with syn-addition

4. anti-markovnikov orientation with anti-addition

5. markovnikov orientation with both syn- and anti-addition

The alignment of a comet's ion tail in space is primarily controlled by the interaction between the solar wind and the charged particles emitted by the comet.

This interaction is governed by the interplay of electromagnetic and gravitational forces. The resulting ion tail generally points away from the Sun, but its precise direction can be influenced by factors such as the orientation of the comet's rotation axis and the shape of its magnetic field.

1. The direction of a comet's ion tail in space is determined by the interplay of various forces. When a comet approaches the Sun, its surface heats up, causing the release of gas and dust particles from its nucleus. These particles, which are electrically charged, form the comet's coma, a glowing cloud around the nucleus.

2. As the comet moves closer to the Sun, the intense solar radiation and the high-speed stream of charged particles known as the solar wind exert forces on the charged particles in the coma. The solar wind, consisting of mostly protons and electrons, carries a magnetic field that interacts with the charged particles emitted by the comet.

3. The solar wind's magnetic field can cause the charged particles in the coma to experience a force known as the Lorentz force. This force acts perpendicular to both the direction of the magnetic field and the velocity of the charged particles. As a result, the Lorentz force causes the charged particles to curve and align their paths in a direction perpendicular to the solar wind's magnetic field.

4. The overall effect of the solar wind's interaction with the charged particles emitted by the comet is that the ion tail is pushed away from the Sun. The ion tail generally points in the direction opposite to the Sun, forming a long, glowing trail that stretches millions of kilometers into space. However, the direction of the ion tail can be influenced by other factors, such as the orientation of the comet's rotation axis and the shape of its magnetic field.

5. In conclusion, the alignment of a comet's ion tail in space is primarily determined by the interaction between the charged particles emitted by the comet and the solar wind. The resulting forces, including the Lorentz force, push the ion tail away from the Sun. While the general direction of the ion tail is away from the Sun, specific factors like the comet's rotation axis and magnetic field can influence its orientation.

learn more about solar wind here: brainly.com/question/16524443

#SPJ11

Answer:There are two cell types: prokaryotes and eukaryotes. Prokaryotic cells are usually single-celled and smaller than eukaryotic cells. Eukaryotic cells are usually found in multicellular organisms, but there are some single-celled eukaryotes.

Answer and Explanation:

This means that at 80 degrees C, the saturated solution of KCl will contain 50 grams of KCl for every 100 grams of water.

Answer: People will have less food to eat and less nutrition and the food chain will go down. Sorry if I'm not right.

Explanation:

Answer:

It will effect all our wildlife and waters Becuase some fishes eat alge and other animals that reporduce fast and it will break the food chain many animals will die

Explanation:

Answer:

A

Explanation:

Caus it makes sense