Determine the number of moles of molecules (or formula units) in each sample.
39.2g sodium chloride
28.3g nitrogen monoxide
5.00kg carbon dioxide
2.77mg carbon tetrachloride

The thermometer displays boiling point of butanol as per forces of attraction and butanol can't be distilled by heating the flask with a water bath because it has low boiling point.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

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Answer:

2HCl(aq)+K2CO3(aq)→H2O(l)+CO2(g)+2KCl(aq)

Explanation:

HCl(aq)+K2CO3(aq)→H2O(l)+CO2(g)+KCl(aq)

2HCl(aq)+K2CO3(aq)→H2O(l)+CO2(g)+2KCl(aq)

H-1*2=2                                      H-2

Cl-1*2=2                                     Cl- 1*2=2

K -2                                           K-1*2=2

C- 1                                           C-1

O - 3                                        O-3

The matter is substances is present everywhere, including the mixtures, elements, and compounds. Mixtures are matter that can be separated by physical methods.

Mixtures are defined as substance and matter that is made of two or more components (substances) that are not bonded or linked chemically and rather shows physical interaction.

A mixture for example of sand and water can be physically separated by filtration, seawater by evaporation, etc. Whereas, a compound involves chemical interactions that are not separated by physical means.

Therefore, a mixture can be separated by physical process.

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Answer:D

Explanation:

The majority of explosives that forensic scientists deal with in investigations are homemade bombs. Therefore, option D is correct.

In general, forensic scientists do the following kinds of work: They examine tangible materials gathered from crime sites. They offer forensic expert testimony both before and during court proceedings. Blood, hair, and other trace evidence are gathered by investigators and sent to crime labs for analysis.

Criminalists or crime scene investigators are generalist forensic science technicians that gather evidence at the scene of a crime and conduct scientific and technical examination in labs or offices.

A forensic scientist's key responsibilities include gathering evidence at the crime scene, documenting the findings in reports, processing the evidence at the lab, and giving testimony in court.

Thus, option D is correct.

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Taking into account the reaction stoichiometry, 4.515 grams of N₂ can be produced from 8.73 grams of H₂O₂ and 5.16 grams of N₂H₄.

In first place, the balanced reaction is:

N₂H₄ + 2 H₂O₂ → N₂ + 4 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 34 grams of H₂O₂ reacts with 32 grams of N₂H₄, 8.73 grams of H₂O₂ reacts with how much mass of N₂H₄?

\(mass of N_{2} H_{4} =\frac{8.73 grams of H_{2} O_{2}x 32 grams of N_{2} H_{4} }{34grams of H_{2} O_{2}}\)

mass of N₂H₄= 8.22 grams

But 8.22 grams of N₂H₄ are not available, 5.16 grams are available. Since you have less mass than you need to react with 8.73 grams of H₂O₂, N₂H₄ will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 32 grams of N₂H₄ form 28 grams of N₂, 5.16 grams of N₂H₄ form how much mass of N₂?

\(mass of N_{2} =\frac{5.16 grams of N_{2} H_{4} x28 grams of N_{2}}{32 grams of N_{2} H_{4} }\)

mass of N₂= 4.515 grams

Then, 4.515 grams of N₂ can be produced from 8.73 grams of H₂O₂ and 5.16 grams of N₂H₄.

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Answer:

The molar mass of atoms of an element is given by the standard relative atomic mass of the element multiplied by the molar mass constant

Explanation:

As per the given reaction 2 moles or 64 g of S produces  moles or 196 g of sulphuric acid. Hence, mass of sulphur needed to produce 2.7× 10¹⁴ g of sulphuric acid is 8.8 × 10¹³ g.

Sulphuric acid is a very strong acid having very much industrial and laboratory significance. It is industrially produced by the combination of sulfur and oxygen gas.

From the balanced equation, it is clear that, 2 moles of S gives 2 moles of sulphuric acid.

molar mass of sulphuric acid = 98 g/mol

mass of 2 moles = 196 g.

mass of S = 32 g

mass of 2 moles of S = 64 g.

Then the mass of S required to produce 270 million tones of sulphuric acid is :

( 2.7× 10¹⁴ g × 64)/196 g = 8.8 × 10¹³ g.

Therefore, the mass of S required to 270 million tones of sulphuric acid is 8.8 × 10¹³ g.

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Red, orange, yellow, green, blue, and violet are all colours in the visible spectrum that make up white light.

When white light passes through a prism, it is separated into its component colors, known as the visible spectrum.When all of these colors are combined, they produce white light. The phenomenon of white light is explained by the science of optics, which states that when different colors of light are combined, they create a new color of light that is the combination of all of the colors. This is why, when all of the colors of the visible spectrum are combined, the result is white light.

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The change in the total energy of the system is -93.1kJ.

Let us note that the term thermodynamics has to do with the study of heat. Recall that heat is that which leads to the increase in the temperature of a body. From the first la of thermodynamics, we know that heat can neither be created nor destroyed but can be transformed from one form to another as we can see.

We also know from the first law of thermodynamics that;

ΔE = q + w

ΔE  = total internal energy

q = heat absorbed or evolved

w = work done

Let us find the work done as;

w =pΔV

w = 45.0 atm (3 - 8.8)

w = -261  atm L or -26.4 kJ

We have q as  -66.7 kJ  because heat was released

ΔE  = -66.7 kJ - 26.4 kJ

ΔE  = -93.1kJ

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Answer:

A

Explanation:

Answer:

A) An interdisciplinary team shares goals and responsibilities. In Ancient Egypt, each level of professionals had different goals and responsibilities.

Explanation:

Answer:

platelets?

Explanation:

the question is vauge. but I hope you got it right!

Answer:

Cell division ?

Explanation:

As a result, the ideal gas law is applied, and the pressure of the gas in the container is 1.44 atm.

The Kelvin temperature and hence the volume are going to be in direct proportion when the pressure on a sample of a dry gas is held constant, according to the definition of the Charles Law Formula. PV = k is the law's equation, and k might be a constant.

This issue can be resolved by applying the ideal gas law:

PV = nR

T = -52 °C + 273.15 = 221.15 K

n = 0.642 mol

V = 8.6 L

T = 221.15 K

\(R = 0.0821 L·atm/mol·K (gas constant for ideal gases)\)

PV = nRT

P = nRT/V

P = (0.642 mol)(0.0821 L·atm/mol·K)(221.15 K)/(8.6 L)

P = 1.44 atm

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The carrying capacity of the area was reduced in the year 10 according to the graph that shows the number of foxes on the island over a span of 15 years.

The graph shows a population of foxes over a span of 15 years. The y-axis represents the number of foxes on the island, while the x-axis represents time. The study began with the earlier 0 and ran until the start of year 15. According to the graph, the carrying capacity of the area was reduced in the year 10.

In the graph, it is shown that the population of foxes on Sunday Gill island had a significant increase from year 0 to year 3. After year 3, the fox population started to decrease and then remained fairly constant until year 10. After year 10, the population of foxes on the island started to decline more rapidly until the end of the study in year 15

This decline in the population of foxes on the island is most likely due to the reduction in carrying capacity of the area. Carrying capacity refers to the maximum number of individuals that an environment can sustain. When the carrying capacity of an environment is reached, it means that the environment can no longer provide the necessary resources to sustain the population.  

There are various factors that can cause a reduction in carrying capacity, such as environmental degradation, competition for resources, or a natural disaster. In this case, it is not clear what caused the reduction in carrying capacity in year 10, but it is likely that it was due to some environmental factor that impacted the availability of resources for the fox population.
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A solution containing alcohol and water. If the mole fraction of water is 0.600, 0.4 is the mole fraction of alcohol.

A mole fraction is a measurement of concentration that is equal to the product of the moles of a component and the total moles of the solution.

Mole fraction is indeed a unitless phrase since it represents a ratio. When all the parts of a solution's mole fraction are summed up, they equal one.

moles fraction of water + mole fraction of alcohol =1

0.600+ mole fraction of alcohol =1

mole fraction of alcohol= 1-0.600

                                       =0.4

Therefore, 0.4 is the mole fraction of alcohol.

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The equilibrium constant at this temperature is Kc= 4.17 x 10⁻⁶.

Since the equilibrium constant depends on the equilibrium concentration of both the reactants and the products of the chemical reaction.

Balanced reaction equation

2CH₄(g)⇌C₂H₂(g)+3H₂(g)

The initial concentration of the CH₄ = 0.093 M

The equilibrium concentration of the H = 0.017 M

Equilibrium constant = ?

Let's make the ice table

2CH₄(g) ⇌ C₂H₂(g) + 3H₂(g)

0.093 M 0 0

-2x +x +3x

0.093-2x x 0.017 M

3x = 0.017 M

Therefore, x =0.017 M /3 = 0.00567 M

Therefore, the equilibrium concentration of CH₄ =

0.093 M – 2x = 0.093 M – (2 x 0.00567 M) = 0.0817 M

Equilibrium concentration of the C₂H₄ = x = 0.00567 M

Let's write the equilibrium constant expression

Kc= [C₂H₄[H2]³/[CH₄]²

Let's put the values in the formula

Kc= [0.00567][0.017]³/[0.0817]²

Kc= 4.17 x 10⁻⁶

Therefore, the equilibrium constant is 4.17 x 10⁻⁶.

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Answer:

strongest magenetic field in the solar system

Explanation:

Answer:

Figure 2 represents a nonpolar molecule containing polar covalent bonds

Explanation:

The CO2 molecule is linear, formed by 3 atoms and the electronegativity variations are equal, so its dipolar moment will be null, and this molecule will be nonpolar, however, it has polar covalent bonds.

The true about the luminol is it does not affect the DNA of the substance.

Luminol is a type of chemical which does not affect the DNA of the substance. luminol is used in forensic test by the forensic scientist. luminol solution will react with blood and produce the light.  luminol chemical is sensitive to blood.  in forensic test luminol is used to detect the amount of blood at the crime scene. it will react with the iron in the hemoglobin. luminol is insoluble in water.

Thus, The true about the luminol is it does not affect the DNA of the substance.

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Explanation:

Türküm lben .Türk varmi kardaşlar!!!

Answer:

D color

Explanation:

One physical test for minerals is to check their color. Certain kinds of minerals always have a similar color, but most minerals have a range of colors. This is the least informative property of a mineral. Some words to describe color are: pale, bright, streaked, splotchy, banded, and speckled.

This is from my school assignment good luck everyone!! :D

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Thus option C is correct option.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

Giant planet atmospheres have layers of clouds and aerosols (tiny liquid droplets) made from different chemicals because different chemicals condense at different temperatures.

Therefore,  option C is correct option.

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Answer:

A will float on top of B.

Explanation:

B is more dense. example A is oil and B is water.

Answer:

When it is absorbed, it is converted into heat energy, and the object heats up.

Explanation:

When the photon is absorbed, it is released as heat energy.

Since then, it has spread to other rivers, colonized them, clogged the water intake pipes, and competed with local species for food. Zebra mussels are the method for removing a lot of plankton from the water column.

The Caspian Sea in Asia is where zebra mussels, or Driessen polymorpha, are found naturally. They arrived in the Great Lakes region in the late 1980s via ballast water from a transatlantic ship. The Great Lakes, Mississippi, Tennessee, Hudson, and Ohio river basins were all overrun by these mussels within ten years. The lake's brilliant blue hue is a result of Tahoe's clean air and water. There is more to this phenomenon than just the fact that Lake Tahoe's surface reflects the sky, which contributes to its blue color.

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Charles's law of gases states that the density of an ideal gas is inversely proportional to its temperature at constant pressure.

The equation is as follows;

Va/Ta = Vb/Tb

Where;

0.67/362 = 1.12/Tb

0.00185Tb = 1.12

Tb = 605.41K

This temperature in °C is 605.41 - 273 = 332°C

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The mass of water that can be obtained is 2.2 g of water.

We know that in the case that we have here, we are going to depend on the stoichiometry of the reaction and this is very important in the determination of the amount of the water that can be formed.

Now we can see that the reaction equation can be written from the fact that; \(2H_{2} (g) + O_{2} (g) ---- > 2H_{2} O(g)\). Then we can see that in this kind of chemical reaction we have to apply the stoichiometry.

Number of moles of the hydrogen = 14.8g/2 g/mol = 7.4 moles

Number of moles of oxygen = 34.8 g/32 g/mol = 1.1 moles

Given that 2 moles of hydrogen reacts with 1 mole of oxygen

7.4 moles of hydrogen reacts with 7.4 * 1/2

= 3.7 moles

Hence oxygen is the limiting reactant.

1 mole of oxygen produces 2 moles of water

1.1 moles of oxygen would produce 1.1 * 2/1

= 2.2 moles of water

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Since one mole of every substance contains 6.0 * 10²³ formula units, the maximum number of formula units in one mole of NaCl is 6.0 * 10²³ formula units.

Formula units refer to the empirical formula of one mole of any substance.

One mole of every substance contains the same amount of formula units.

The number of formula units in 1 mole of a substance is given by the Avogadro number.

The Avogadro number is equal to 6.0 * 10²³ particles.

Hence 1 mole of NaCl will contain 6.0 * 10²³ NaCl particles.

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The vapor pressure of methanol at 40°C is 0.234 atm.

Only two types of alcohol are methanol and ethanol. Ethanol, sometimes referred to as ethyl alcohol, has a chemical composition of two carbon atoms. Methanol, sometimes referred to as methyl alcohol, is made up of just one carbon atom.

ln(P2/P1) = (ΔHvap/R) x (1/T1 - 1/T2)

ΔGvap = -RTln(Pvap/P) = ΔHvap - TΔSvap

ΔGvap = -RTln(Pvap/P) = -166.6 kJ/mol

ΔSvap = S(g) - S(l) = 239.9 J/mol-K - 126.8 J/mol-K = 113.1 J/mol-K

ΔHvap = ΔGvap + TΔSvap = -166.6 kJ/mol + (298.15 K)(113.1 J/mol-K) = -134.6 kJ/mol

Now we can use the Clausius-Clapeyron equation to find the vapor pressure of methanol at -30°C and 40°C.

At -30°C, we have:

T1 = 25°C + 273.15 = 298.15 K

T2 = -30°C + 273.15 = 243.15 K

ΔHvap = -134.6 kJ/mol

R = 8.314 J/mol-K

ln(P2/5 atm) = (-134.6 kJ/mol / 8.314 J/mol-K) x (1/298.15 K - 1/243.15 K)

P2 = 0.0038 atm

Therefore, the vapor pressure of methanol at -30°C is 0.0038 atm.

At 40°C, we have:

T1 = 25°C + 273.15 = 298.15 K

T2 = 40°C + 273.15 = 313.15 K

ΔHvap = -134.6 kJ/mol

R = 8.314 J/mol-K

ln(P2/5 atm) = (-134.6 kJ/mol / 8.314 J/mol-K) x (1/298.15 K - 1/313.15 K)

P2 = 0.234 atm

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