If you change the atomic mass to a whole number and subtract the atomic number from it, what does the answer symbolize?

Answer:

A

Explanation:

The pressure of the helium gas (He) in the wet gas mixture is 833.8 mmHg.

In order to find the pressure of the helium gas in the wet gas mixture, we need to use the concept of partial pressures. According to Dalton's Law of Partial Pressures, the total pressure of a gas mixture is equal to the sum of the partial pressures of each individual gas present in the mixture. In this case, the wet gas mixture contains helium (He) and water vapor (H2O). The pressure of water vapor (H2O) is given as 21.2 mmHg, which means that the partial pressure of water vapor (H2O) in the mixture is 21.2 mmHg. We can now use the total pressure and the partial pressure of water vapor (H2O) to find the partial pressure of helium (He) in the mixture. To do this, we can subtract the partial pressure of water vapor (H2O) from the total pressure:

Partial pressure of helium (He) = Total pressure - Partial pressure of water vapor (H2O)

Partial pressure of helium (He) = 855 mmHg - 21.2 mmHg

Partial pressure of helium (He) = 833.8 mmHg

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Answer:

The answer is A

Explanation:

I took the quiz

Answer:

Explanafgr7tfgt4ttion:

Answer:

Look at the picture below

Explanation:

Answer:

JOSHUA

Explanation:

JOSHUA

Answer:

Precipitation reactions are ones in which at least one of the reactants is in the aqueous phase (i.e., dissolved in water), and a solid forms on the product side which was not present on the reactant side. If all the reactants are solid, then a solid product forming should not be called a precipitate. To be called a precipitate, an insoluble product must form from within solution, either from a solid and solute interacting, or from an interaction strictly between solutes.

Explanation:

To calculate the molar mass of the molecule, we first need to find out what molecule it is. Since you have mentioned it contains both carbon and oxygen, it could be either carbon monoxide (CO) or carbon dioxide (CO2).

Assuming it is carbon dioxide, which is more commonly encountered, we can use the Ideal Gas Law to find the number of moles of CO2 in 1 liter at STP (Standard Temperature and Pressure, which is 0 degrees Celsius and 1 atm pressure).

The Ideal Gas Law states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

At STP, the pressure is 1 atm, the volume is 1 liter, and the temperature is 273 K (0 degrees Celsius + 273).

So, we have:

PV = nRT

(1 atm)(1 L) = n(0.0821 L atm/mol K)(273 K)

n = 0.040 mol CO2

Now, we can calculate the mass of CO2 in 1 liter at STP using its density of 6.02 g/L:

mass = density x volume

mass = (6.02 g/L) x (1 L)

mass = 6.02 g

So, the molar mass of CO2 is:

molar mass = mass / number of moles

molar mass = 6.02 g / 0.040 mol

molar mass = 150.5 g/mol

Therefore, the molar mass of the carbon and oxygen molecule, assuming it is carbon dioxide, is 150.5 g/mol.

Answer:

34.5J

Explanation:

Amount of Heat(Q) = mc∆T

where m (mass of aluminum) = 5.50g

c (specific heat capacity of aluminum) = 0.897J/g°C and ∆T = 95.0°C - 25.0°C = 70.0°C

Q = 5.50x 0.897x 70.0

= 34.5354J = 34.5J

The amount of heat absorbed when 5.50 g of aluminum is heated from 25.0°C to 95.0°C is 34.5 J.

Heat is defined as a form of the energy transmitted from one body to another as a result of a temperature difference.

It can also be defined as the potential energy stored in the bonds that hold the object's particles together.

Heat absorption is defined as absorption of heat without increasing the temperature at the certain point.

Amount of heat = mcΔT

Where m = 5.50g

           c = 0.897 J/g °C

           ΔT =  95.0°C - 25.0°C

                 = 70.0°C

So, amount of heat = 5.50 x 0.897 x 70.0

                                = 34.5354 J = 34.5 J

Thus, the amount of heat absorbed when 5.50 g of aluminum is heated from 25.0°C to 95.0°C is 34.5 J.

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Answer:

A molecule is the smallest particle of a substance that is made up of 2 or more atoms

An atom is the smallest particle of any pure element

An element is a substance that cannot be broken chemical and physical processes

A molecule is known as the building block of matter

A compound is a chemical substance that is made up of 2 more more different atoms bonded together

Answer:

The most common reason for alloying is to increase the strength of a metal. This requires that barriers to slip be distributed uniformly throughout the crystalline grains. On the finest scale, this is done by dissolving alloying agents in the metal matrix (a procedure known as solid solution hardening

Explanation:

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The amount of seawater that will be displaced would be 1.3274 x \(10^5\)  \(ft^3\)

Density = mass/volume.

Since a floating object displaces its own weight, a 4247 tons ship will also displace the same amount of water.

4247 tons of seawater = 3.8528 x \(10^9\) g

volume of 3.8528 x \(10^9\) g seawater = mass/density = 3.8528 x \(10^9\) g/1.025 = 3758829268.29 cubic centimeter.

3758829268.29 \(cm^3\) = 132741.80 \(ft^3\) or 1.3274 x \(10^5\)  \(ft^3\)

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Answer:

Life in the Han Dynasty (206 BCE - 220 CE) differed significantly from today in family, government, social structure, religion, and trade. For example, the Han Dynasty emphasized a patriarchal family structure, where the eldest male held authority, and filial piety was highly valued. In contrast, contemporary societies embrace more egalitarian family dynamics with shared decision-making.

The government system of the Han Dynasty relied on a centralized bureaucracy and emphasized meritocracy, while modern societies often adopted democratic systems. Socially, the Han Dynasty followed a hierarchical model influenced by Confucian principles, whereas contemporary societies strive for greater equality and social mobility.

Religion in the Han Dynasty combined Confucianism, Taoism, and Buddhism, whereas modern societies exhibit diverse religious beliefs. Lastly, trade in the Han Dynasty thrived along the Silk Road, while modern trade was globally interconnected and facilitated by technological advancements. These differences highlight the evolution of society over time.

Explanation:

Answer:

the evidence statement contains reasoning.

Explanation:

the reason that this piece of information is reasoning rather than evidence is because it doesn't tell us the temperatures of the other substances (if any.) if we look at this substance and it has the most constant temperature compared to the others, how will we know if it is the most constant if we don't know the other substances' data?

this is reasoning because the evidence should tell us more about the substance and the others.

Answer:

Yes it is. 0.34 kg = 340 g (Kilograms and grams)

Explanation:

When we convert from kg to grams we multiply by 1000 because kilo mean 1000.

0.34*1000= 340

The volume of hydrogen gas produced in the reaction of 73 grams of zinc and 73 grams of hydrochloric acid (under normal conditions) is approximately 22.4 liters.

To calculate the volume of hydrogen gas produced in the reaction of zinc and hydrochloric acid, we need to use the principles of stoichiometry and the ideal gas law.

First, let's write the balanced chemical equation for the reaction between zinc (Zn) and hydrochloric acid (HCl):

Zn + 2HCl →\(ZnCl_2\)+ H2

From the equation, we can see that one mole of zinc reacts with two moles of hydrochloric acid to produce one mole of hydrogen gas. To determine the number of moles of zinc and hydrochloric acid, we need to convert the given masses into moles.

The molar mass of zinc (Zn) is approximately 65.38 g/mol, so 73 grams of zinc is equal to:

73 g Zn * (1 mol Zn / 65.38 g Zn) ≈ 1.116 mol Zn

Similarly, the molar mass of hydrochloric acid (HCl) is approximately 36.46 g/mol, so 73 grams of HCl is equal to:

73 g HCl * (1 mol HCl / 36.46 g HCl) ≈ 2.002 mol HCl

According to the balanced equation, the reaction produces one mole of hydrogen gas for every two moles of hydrochloric acid. Therefore, since we have 2.002 moles of HCl, we expect to produce half that amount, or approximately 1.001 moles of hydrogen gas.

To calculate the volume of hydrogen gas, we can use the ideal gas law, which states:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. In this case, we assume the reaction is conducted under normal conditions, which means a pressure of 1 atmosphere and a temperature of 273.15 Kelvin.

Rearranging the equation to solve for V, we have:

V = nRT / P

Substituting the values, we get:

V = (1.001 mol) * (0.0821 L·atm/(mol·K)) * (273.15 K) / (1 atm) ≈ 22.4 L

Therefore, the volume of hydrogen gas produced in the reaction is approximately 22.4 liters.

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Answer:

Answer: 2.5 mol O2 are needed to make 5 mol H2O, assuming H2 is in excess.

Explanation:

Answer:

BOX 2

Explanation:

Precision relates to the consistency and reproducibility of measurements, while accuracy reflects how close measurements are to the true value.

Precision and accuracy are two important concepts in the context of errors in measurements. While they both pertain to the quality of data, they refer to different aspects.

Precision refers to the degree of consistency or reproducibility in a series of measurements. It reflects the scatter or spread of data points around the average value. If the measurements have low scatter and are tightly clustered, they are considered precise. On the other hand, if the measurements have a high scatter and are widely dispersed, they are considered imprecise.

Accuracy, on the other hand, refers to the closeness of measurements to the true or target value. It represents how well the measured values align with the actual value. Accuracy is achieved when measurements have a small systematic or constant error, which is the difference between the average measured value and the true value.

Errors in measurements can be classified into two types: random errors and systematic errors.

Random errors are associated with the inherent limitations of measurement instruments or fluctuations in the measurement process. They lead to imprecise data and affect the precision of measurements. Random errors can be reduced by repeating measurements and calculating the average to minimize the effect of individual errors.

Systematic errors, on the other hand, are caused by consistent biases or inaccuracies in the measurement process. They affect the accuracy of measurements and lead to a deviation from the true value. Systematic errors can arise from factors such as instrumental calibration issues, environmental conditions, or experimental techniques. These errors need to be identified and minimized to improve the accuracy of measurements.

In summary, precision refers to the degree of consistency or reproducibility of measurements, while accuracy refers to the closeness of measurements to the true value. Random errors affect precision, while systematic errors affect accuracy. To ensure high-quality measurements, both precision and accuracy need to be considered and appropriate techniques should be employed to minimize errors.

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Answer:

B

Explanation:

Answer:

na

Explanation:

Answer:

b

Explanation:

Answer:

I havent the foggiest.

Explanation:

Answer:

Explanation:

I havent the foggies

Answer:

∆Hrxn 1 + ∆Hrxn 3 - ∆Hrxn 2 = ?

-1410.9kJ - 571.6kJ + 3119.4kJ = ?

-2801.1kJ

Answer:

A. [OH⁻] = 2.188x10⁻³M

B. pKb = 6.02

Explanation:

When hydrazine is in equilbrium with water, its reaction is:

N₂H₄(aq) + H₂O(l) ⇄ HN₂H₄⁺(aq) + OH⁻(aq)

Where Kb, is defined as the ratio between concentrations in equilibrium of the species, thus:

Kb = [HN₂H₄⁺] [OH⁻] / [N₂H₄]

A. From pH, you can find [OH⁻], thus:

pH = -log [H⁺]

11.34 = -log [H⁺]

4.57x10⁻¹² = [H⁺]

As 1x10⁻¹⁴ = [OH⁻] [H⁺]

1x10⁻¹⁴ / 4.57x10⁻¹² = [OH⁻]

B. Concentrations in equilibrium of the species are:

[N₂H₄] = 5.0M - X

[HN₂H₄⁺] = X

[OH⁻] = X

Where X is reaction coordinate

As [OH⁻] = 2.188x10⁻³M

X = 2.188x10⁻³M

Replacing:

[N₂H₄] = 5.0M - 2.188x10⁻³M = 4.9978M

[HN₂H₄⁺] = 2.188x10⁻³M

[OH⁻] = 2.188x10⁻³M

Replacing in Kb expression:

Kb = [HN₂H₄⁺] [OH⁻] / [N₂H₄]

Kb = [2.188x10⁻³M] [2.188x10⁻³M] / [4.9978M]

Kb = 9.577x10⁻⁷

pKb is defined as -log Kb

pKb = -log 9.577x10⁻⁷

Answer:

Explanation:

1.1 we have to find mass of Na3PO4;

for that we have to Calculate the moles of Na3PO4 needed:

volume is 100mL = 0.1L

Molar concentration = Moles of solute / Volume of solution in L

0.1 mol/L = Moles of Na3PO4 / 0.1 L

Moles of Na3PO4 = 0.1 mol/L * 0.1 L

Moles of Na3PO4 = 0.01 mol

Now, Calculate the mass of Na3PO4 needed:

so, Mass = Moles of Na3PO4 * Molar mass of Na3PO4

Mass = 0.01 mol * 164 g/mol

Mass = 1.64 g of Na3PO4.

1.2 materials and glassware needed:

1.64 g Sodium phosphate (Na3PO4)

100 mL volumetric flask

weighing balance

Distilled water

Glass rod

Pipette and burette

There is no reason to run these solutes at the 20 MWCO because they are both much smaller than the MWCO of the membrane.

The MWCO (molecular weight cut off) is the molecular weight of a solute at which it will be retained by a membrane during a process such as ultrafiltration or dialysis. If a solute has a molecular weight higher than the MWCO of a membrane, it will be retained and not pass through the membrane. If the molecular weight of a solute is lower than the MWCO, it will pass through the membrane.

In this case, glucose has a molecular weight of 180 g/mol (6 carbons x 12 g/mol per carbon + 6 oxygens x 16 g/mol per oxygen) and albumin has a molecular weight of approximately 81,942 g/mol (607 amino acids x 135 g/mol per amino acid). Both of these solutes have molecular weights that are much lower than 20,000 g/mol, which is a typical MWCO for ultrafiltration or dialysis membranes.

They would both easily pass through the membrane and be lost during the process. Instead, a membrane with a much lower MWCO would be needed if we wanted to retain these solutes during a process such as ultrafiltration or dialysis.

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Answer:

140

Explanation:

do cross multiple the two mL cancel out each other and you are left with 140

The oxidation state on Ec in the given chemical compound  Ec₄O₂ is determined as +1.

The oxidation number or oxidation state, is the total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom.

The given compound;

= Ec₄O₂

The oxidation state of Ec is calculated as follows;

let the oxidation state = x

4x + (2 x -2) = 0

4x - 4 = 0

4x = +4

divide both sides of the equation by "4"

4x/4 = +4/4

x = +1

Thus, the oxidation state on Ec in the given chemical compound  Ec₄O₂ is determined as +1.

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