how many moles of water are in 1.23 times 10^18 water molecules

Answer:

Explanation

substance X will have least volume because it has maximum density and using the relation volume inversly propotional to the density of a substance.

substance Z will have least mass beacause it has least density and using relation mass is directly proportional to the volume of a substance .

substance Z will float in water because its density is less than the water (1 gm/cm^3).

The arrangement of the gases in terms of  deviations from ideal behavior is; chlorine > fluorine > oxygen > Nitrogen.

We know that gases tend to follow the idea gas law. The gases that have ideal behavior tend to show this behavior at high temperatures and low pressure such that the interactions between the gas molecules could be regarded as non existent.

Now; we know that the greater the molar mass of the gas, the greater the gas tends to depart from ideal behavior. As such we would tend to arrange the gases in order of decreasing molar mass.

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Answer:

Assuming that the lemon juice is the only source of H3O+ ions in the water, we can use the formula for pH to calculate the pH of the water-lemon mixture:

pH = -log[H3O+]

First, we need to determine the concentration of H3O+ in the solution. We are given that the concentration of H3O+ after the lemon is squeezed into the water is 0.00006 M. Therefore:

[H3O+] = 0.00006 M

Now, we can substitute this value into the pH formula:

pH = -log(0.00006)

pH = 4.22

Therefore, the pH of the water-lemon mixture is 4.22.

Answer:

I think that's a physical change since nothing is getting it's properties changed.

Explanation:

a chemical change usually changes the properties and cannot be changed back, this is simply washing your hands so I would guess that a physical change. think of like putting water on paper, the properties aren't changed you just have a paper with water on it now and can be easily dried.

Systematic name of this structure is 3-ethylpentane.

Chemical compounds known as isomers have identical chemical formulae but have different properties and atom arrangements inside the molecule. The term "isomer" refers to a substance that exhibits isomerism.

Structural isomers are substances with the same molecular formula but distinct atomic configurations. The way the atoms are attached in this instance is quite different, as seen by the different types of chains that are formed (straight versus branched), the placements of the atoms (such as middle versus end of the parent chain), and the presence of functional groups (e.g., aldehydes versus ketones).

For instance, although sharing the same molecular formula (C3H6O), propanal and propanone have very distinct chemical structures. They are structural isomers as a result.

Isomers of Heptane are:

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The complete question is: The alkane C7H16 exhibits structural isomerism. In fact, 9 structural isomers have this same formula (but different bond arrangements). One such isomeric structure is: What is the correct systematic name for this structure?

Chromosomes are formed inside the nucleus of a cell. They carry genetic information and are responsible for traits and characteristics passed down from one generation to the next. Chromosomes play a crucial role in cell division, and chromosomal abnormalities can lead to a variety of genetic disorders.

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Answer:

urfcing mom

Explanation:

The metric system uses millilitres as the unit of volume, denoted by the letters ml or mL. One cubic centimetre, or one-thousandth of a litre, is equivalent to one millilitre. That's a little sum in the imperial system. The correct option is B.

The volume of a cube with dimensions of 1 cm × 1 cm × 1 cm is equal to one cubic centimetre or cubic centimetre in US English. Its SI unit symbol is cm³ and non-SI abbreviations are cc and ccm. A millilitre's volume is equal to one cubic centimetre.

A millilitre is equivalent to one cubic centimetre. A cubic decimeter is equivalent to one litre. One cubic centimetre is equal to one millilitre since there are 1000 of them in a cubic decimeter.

Thus the correct option is B.

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The concentration of Ca(OH)2 in the solution is approximately 1.33 x 10^(-6) M.

To find the concentration of Ca(OH)2 in a solution with a pH of 8.57, we need to use the concept of pOH, which is the negative logarithm of the hydroxide ion concentration ([OH-]). The pOH can be calculated by subtracting the pH from 14, which gives us 14 - 8.57 = 5.43.

Since Ca(OH)2 produces two OH- ions for every molecule of Ca(OH)2 that dissolves, the concentration of OH- ions will be twice the concentration of Ca(OH)2. Thus, we have [OH-] = 2x, where x represents the concentration of Ca(OH)2.

Taking the antilogarithm of the pOH, we find that [OH-] = 10^(-pOH) = 10^(-5.43).

Since [OH-] = 2x, we can write 2x = 10^(-5.43) and solve for x.

x = (10^(-5.43))/2 ≈ 1.33 x 10^(-6) M

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Learn mole concept to find the answer.

What is mole?

The mole, denoted by the symbol "mol," is the volume of a system that contains the same number of atoms in 0.012 kilograms of carbon-12 as there are elementary particles.

What is solid phosphorus pentachloride?

A crystalline solid with a pungent smell, phosphorus pentachloride is greenish-yellow in color. Water breaks it down into hydrochloric and phosphoric acid as well as heat. It's possible that this heat will ignite nearby combustible material.

2P(s)+5cl₂(gm)⇒2pcl₅(s)

2 moles of p react with 5 moles of cl₂

9.0 moles p react with moles of cl₂= 5 mol/2mol* 9.0mol

=22.5mol cl₂ (required mol of cl₂)

but we have 2.o mol of  cl₂ .

It needs  cl₂ is limiting reactant and p is presenting excess

as the reaction proceed according to the amount of limiting reactant

so, 5 mol of  cl₂  produce 2 mol of pcl₅

2.0 mol of cl₂  produce mol of pcl₅= 2 mol / 5mol*2.0 mol

=0.8 mol pcl5.

hence largest amount of pcl₅ that would be produced is 0.8

Therefore, 0.8 mol present in the pcl5.

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Answer:

Freezing point depression is a property of solutions where the solute lowers the normal freezing point of the solvent.

Answer: Copper (Cu)

Explanation:

Answer:

+1

Explanation:

An atom is considered to be neutral before losing or gaining any electrons. They are neutral in charge because they initially have the same number of protons (with charge of +1 each) and electrons (with a charge of -1 each).

Consider charge in an electron like a balance, with positively charged protons on one side and negatively charged electrons on the other. When you have the same number of each, there is equal amounts of positive and negative charge so the atom is neutral with a charge of zero.

For example, potassium has 19 protons, and 19 electrons. This means it has  19 positive charges and 19 negative charges. If you take away one electron, it now has 19 positive charges and 18 negative charges. So there is one more positive charge than negative, which means it is now an ion (a charged atom) with a charge of +1.

INFORMATION:

We need to determine which is another name for petroleum

STEP BY STEP EXPLANATION:

To determine it, we need to know that:

Petroleum also receives other names such as natural oil, mineral oil, stone oil, noble oil and black oil.

Now, knowing that, we can state that another valid term for petroleum could be oil.

ANSWER:

B. Oil

1.2 L of hydrogen can be produced at a pressure of 2 atm and a temperature of 298 K.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Step 1: Write the balanced equation

Mg + 2 HCl ⇒ MgCl₂ + H₂

Step 2: Calculate the moles corresponding to 2.3 g of Mg

The molar mass of Mg is 24.31 g/mol.

2.3 g × 1 mol ÷24.31 g = 0.095 mol

Step 3: Calculate the moles of H₂ produced

0.095 mol Mg × 1 mol H₂ ÷ 1 mol Mg = 0.095 mol H₂

Step 4: Calculate the volume occupied by the hydrogen

We will use the ideal gas equation.

P × V = n × R × T

V = n × R × T÷P

V = 0.095 mol × (0.0821 atm.L/mol.K) × 298 K÷2 atm

V =  1.2 L

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Answer:

And we have to calculate the number of moles of sucrose present in a lb mass of sucrose: Moles of sucrose=454⋅g342.30⋅g⋅mol−1=1.33⋅mol .

Explanation:

Brainliest Answer Pls

The number of moles of sucrose that the packet contain is 0.0116. mol.

Sucrose is a simple carbohydrate that is sweet in nature. It is present in fruits and plants. Its simple formula is C ₁₂H ₂₂O ₁₁. It is the simple sugar that is eaten.

Glucose and fructose are two examples of simple sugars that make up sucrose. Fructose, glucose, and sucrose are all naturally occurring sugars that are also added to processed meals.

The moles can be calculated by dividing the molar mass by the mass of the compound.

The mass of the sucrose is 4.0g

The molar mass of the sucrose is 342.3 g/mol

To calculate the moles of sugar, we                                                                                                              

Moles of sucrose = 4.0g / 342.3 = 0.0116

Thus, the moles of sucrose is 0.0116 mol.

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The compound formed when magnesium oxide reacts with water is magnesium hydroxide (Mg(OH)₂).

Magnesium oxide (MgO) is an ionic compound consisting of magnesium cations (Mg²⁺) and oxide anions (O²⁻). When it reacts with water (H₂O), the oxygen atom in water attracts the magnesium cation, leading to the formation of magnesium hydroxide.

The reaction can be represented as follows:

MgO + H₂O → Mg(OH)₂

In the resulting compound, magnesium hydroxide, there are two hydroxide ions (OH-) for every magnesium ion (Mg²⁺). The chemical formula Mg(OH)₂ represents this ratio.

Magnesium hydroxide is an alkaline compound and is commonly used as an antacid to treat heartburn and indigestion. It is also used in various industrial applications.

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(a) The 95% confidence interval for the difference between the average growth rate of the plants between the 2 gardening seasons is 1.55 ± 0.187 inches.

(b) The 95% interval from question 8a is narrower than the interval in this question (part a).

(c) The 95% interval from this question (part a) is more convincing in making a point that the head gardener should start using the newer fertilizer, if there is a difference.

Explanation to the short answers written above is written below,

(a) To construct the 95% confidence interval, we use the formula:

Confidence interval = sample mean ± (critical value * standard error)

In this case, the sample mean difference in monthly growth rate is 1.55 inches, and the standard deviation is 0.093 inches. Since the sample size is 49, we can assume the sampling distribution is approximately normal.

Using the appropriate critical value (which depends on the desired confidence level), we can calculate the standard error and construct the interval.

(b) The 95% interval from question 8a is narrower because it was constructed using a larger sample size (100 plants) compared to the current question (49 plants). A larger sample size provides more precise estimates and reduces the standard error, resulting in a narrower confidence interval.

(c) The 95% interval from this question (part a) is more convincing in making a point that the head gardener should start using the newer fertilizer, if there is a difference.

This is because the interval in this question has a smaller margin of error, indicating a higher level of precision in estimating the true difference in growth rates.

A smaller margin of error suggests a more reliable and accurate estimate, providing stronger evidence to support the conclusion that the newer fertilizer has a significant impact on plant growth.

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Answer:Base A is the weakest conductor electricity

Explanation:

Dissociation is a factor that affects electrical conductivity. The greater the percentage of dissociation for bases the stronger the conductivity of electricity.

Given that

Base A dissociates 25% in water

Base B dissociates 50%.

Base C dissociates 75%

We can conclude that  Base A is the weakest conductor oelectricity since it has the lowest percentage of dissociation.

Answer:

Physical reaction

Explanation:

Since there are no other chemicals in the equation, but the state of the chemical is going from a liquid to a gas, you can conclude that this is a physical reaction.

Answer:

101 g Na

Explanation:

To convert between moles and grams, you have to use the molar mass of the substance. The molar mass of sodium is 22.99 g/mol. You use this as the unit converter.

\(4.39molNa*\frac{22.99gNa}{1molNa} = 100.9261gNa\)

Round the number to the lowest number of significant figures; 101 g Na.

The mass of 4.39 moles of sodium (Na) is 100.97grams.

Mass = no. of moles × molar mass

Mass of Na = 4.39 × 23

Mass of Na = 100.97grams.

Therefore, mass of 4.39 moles of sodium (Na) is 100.97grams.

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Answer:

ligma

Explanation:

Answer: Mixing vinegar and baking soda initiates a chemical reaction that produces carbon dioxide and water.

Explanation:

Asnwer: average atomic mass of chromium is 52amu

Calculations:

49.946amu: 4.350%= 0.0435

51.941amu: 83.790%= 0.8379

52.941amu: 9.500%= 0.095

53.939amu: 2.360%= 0.0236

Average atomic mass of chromium = 0.0435(49.946) + 0.8379(51.941) + 0.095(52.941) + 0.0236(53.939)

= 51.9963703amu

= 52 amu

Answer:

The essence including its particular subject is outlined in the following portion mostly on clarification.

Explanation:

and,

chemical energy ⇒ heat energy + light energy + sound energy

Answer:

(a) 55 kJ of heat are released when 1 mol of reactant A is used;

(b) 110 kJ of heat are released when 2 moles of reactant A are used;

(c) 27.5 kJ of heat are released when 1 mol of reactant B is used;

(d) 55 kJ of heat are released when 2 moles of reactant B are used.

Explanation:

The question requires us to determine the amount of heat released when the given amounts of reactants are used, considering the following balanced chemical equation:

When the enthalpy change for a reaction (or heat of reaction, ΔH) is given in units of energy, such as kilojoules (kJ), and not units of energy per mol (such as kJ/mol), we can consider that ΔH corresponds to the heat absorbed or released for the molar quantities of reactants as given in the balanced chemical equation. In the case given by the question, for example, we can say that 55 kJ of energy are released when 1 mol of A reacts with 2 moles of B.

Therefore, we can use the molar quantitites from the balanced chemical equation as a reference to determine the amount of heat released when different amounts of reactants are used.

Considering the information above, we can calculate:

(a) heat released when 1 mol of A reacts:

Note that 1 mol of A corresponds to the amount of reactant A given by the balanced chemical equation. Therefore, 55kJ of energy are released when 1 mol of A is used.

(b) heat released when 2 moles of A reacts:

Note that 2 moles of A corresponds to the double of the amount of reactant A given by the balanced chemical equation. Thus, we must multply ΔH by 2: 55 kJ x 2 = 110 kJ of energy are released when 2 moles of A are used.

(c) heat released when 1 mol of B reacts:

Note that 1 mol of B corresponds to half of the amount of reactant B given by the balanced chemical equation. Thus, we must divide ΔH by 2: 55 kJ / 2 = 27.5 kJ of energy are released when 1 mol of B is used.

(d) heat released when 2 moles of B reacts:

Note that 2 moles of B corresponds to the amount of reactant B as given by the balanced chemical equation. Therefore, 55 kJ of energy are released when 2 moles of B are used.

a. Oxygen is the limiting reactant.b. 4.32 g Fe2O3 are formed.c. 0.96 g of excess oxygen remains after the reaction stops.

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The component that will limit the reaction is:

a. HCl (Hydrochloric acid)

To determine the limiting reagent in the given chemical reaction, we need to compare the moles of each reactant to the stoichiometric ratio of the balanced equation.

Let's calculate the number of moles for each reactant:

For Zn:

Molar mass of Zn = 65.38 g/mol

Number of moles of Zn = mass / molar mass = 3.27 g / 65.38 g/mol ≈ 0.05 mol

For HCl:

Molar mass of HCl = 36.46 g/mol

Number of moles of HCl = mass / molar mass = 3.30 g / 36.46 g/mol ≈ 0.09 mol

According to the balanced equation, the stoichiometric ratio between Zn and HCl is 1:2. This means that for every 1 mole of Zn, we need 2 moles of HCl.

In this case, the number of moles of Zn (0.05 mol) is less than half of the number of moles of HCl (0.09 mol). Therefore, Zn is the limiting reagent, as it will be completely consumed before all the HCl can react.

So, the component that will limit the reaction is:

a. HCl (Hydrochloric acid)

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C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.

In the Millikan oil droplet experiment, the negatively charged oil droplets are subjected to an electric field created by the charged plates. The electric force (Fe) acts on the oil droplet in a direction opposite to the gravitational force (Fg). When Fe is greater than Fg, the electric force overcomes the gravitational force, causing the negatively charged oil droplet to experience an upward force. As a result, the oil droplet moves freely upward toward the negatively charged plate.

Option B is incorrect because if Fe is equal to Fg, the forces balance each other, resulting in a stationary droplet. However, the question states that Fe is increased until it is greater than Fg, implying that the droplet is no longer stationary but moves in response to the electric force.

Therefore, option C is the correct answer, as it describes the effect of an electric field on the motion of a negatively charged oil droplet in the Millikan oil droplet experiment.

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Answer:

C D

Explanation: