A flask contains a mixture of hydrogen gas and water vapor at STP. If the pressure of the water vapor is 19.5 mmHg, then what is the pressure of the hydrogen gas?


779 mmHg
779 mmHg

760 mmHg
760 mmHg

81.7 mmHg
81.7 mmHg

741 mmHg

The unknown from the given question are:

The following data were obtained from the question:

The mass of the iron can be obtain as shown below:

Q = MCΔT

Inputting the given parameters, we have

55 = M × 0.449 × 36

55 = M × 16.164

Divide both sides by 16.164

M = 55 / 16.164

M = 3.40 g

Thus, we can conclude from the above calculation that the mass of the iron is 3.40 g

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Wavelength is chosen by analyzing the spectrogram.

Wavelength can be defined as the distance between two successive crests or troughs of a wave. It is measured in the direction of the wave.

A spectrogram gives a going for walks show of a sound signal because it takes place in real time, a spectrum, however, offers us a photograph of the sound at a particular factor in time. A spectrum can permit you to see.

Spectrograms map out sound in a comparable way to a musical rating, only mapping frequency rather than musical notes. Seeing frequency energy allotted over the years in this manner allows us to genuinely distinguish each of the sound factors in a recording, and their harmonic shape.

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Answer:

This relationship between pressure and volume is known as Boyle's lawA law that states that at constant temperature, the volume of a fixed amount of a gas is inversely proportional to its pressure., after its discoverer, and can be stated as follows: At constant temperature, the volume of a fixed amount of a gas is. The pressure law states that for a constant volume of gas in a sealed container the temperature of the gas is directly proportional to its pressure. This can be easily understood by visualising the particles of gas in the container moving with a greater energy when the temperature is increased.

Explanation:

Answer:

basically increased temperature causes an increase in pressure. and vise versa.

The inorganic substance with the chemical formula BaSO4 is barium sulfate (or sulphate). It is a tasteless, crystalline white substance that is insoluble in water.

A barium cation and a sulfate anion are the two elements that make up barium sulfate. There are four oxygen atoms joined to the sulfur. A sulfate salt of barium, known as BaSO4, is present in the mineral barite. It is a white crystalline substance that is soluble in strong acids but insoluble in water and alcohol.

Elements include both barium and bromine. Barium is a metal belonging to Group 2 of the modern periodic table, and bromine is a non-metal belonging to Group 17 (halogen).

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Polysaccharides are formed by bonding monosaccharides through a glycosidic bond. This is what allows us to obtain long chains of monosaccharides that form the structural support for the cell walls of plants and animals. To determine the chemical formula of a polymer made from 4 glucose and 2 altroses,

we will first write down the molecular formula of each monosaccharide. Glucose: C6H12O6Altrose: C6H12O6A polymer of 4 glucose monosaccharides would have the chemical formula: 4(C6H12O6) = C24H42O21A polymer of 2 altrose monosaccharides would have the chemical formula: 2(C6H12O6) = C12H22O11To determine the chemical formula of a polymer made from 4 glucose and 2 altroses,

we need to add the two chemical formulas together: C24H42O21 + C12H22O11 = C36H64O32Therefore, the chemical formula of a polymer made from 4 glucose and 2 altroses is C36H64O32.

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The amount of energy required to decompose 765g of PCl₃ is 887.7 kJ calculated by using the formula: Q = m × ∆H.


To calculate the amount of energy required to decompose 765g of PCl₃, we need to find the enthalpy change (∆H) of the reaction. According to the balanced equation, 1 mole of PCl₃ decomposes to form 1 mole of PCl₅ and 1 mole of Cl₂. The enthalpy change for this reaction can be found using Hess's Law or from the enthalpy of formation values of the reactants and products.

The enthalpy change of the reaction is ∆H = ∆Hf(PCl₅) + ∆Hf(Cl₂) - ∆Hf(PCl₃)

Substituting the values, we get: ∆H = (-128.2) + (0) - (-287.5) = 159.3 kJ/mol

Now, we can use the formula Q = m × ∆H to calculate the amount of energy required to decompose 765g of PCl₃.

Number of moles of PCl₃ = 765/137.33 = 5.57 mol

Amount of energy required = 5.57 mol × 159.3 kJ/mol = 887.7 kJ

Therefore, the amount of energy required to decompose 765g of PCl₃ is 887.7 kJ.

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The number of grams of Zinc used is 1962g, the volume of hydrogen gas formed at STP is 672.071L and the molar concentration of Zinc Chloride is 300M.

1. The number of moles of Zn used up is given by the equation:

n = CV

Since the volume is given in mL, we must convert it to L before plugging it into the equation.

n = (300 mol/L)(100 mL)(1 L/1000 mL)

n = 30 mol

The molar mass of Zn is 65.39 g/mol, so the number of grams of Zn used up is given by:

m = nM

m = (30 mol)(65.39 g/mol)

m = 1962 g

2. The number of moles of H₂ formed is also 30 mol. One mole of any gas occupies 22.4 L at STP, so the number of liters of H₂ formed is given by:

V = nRT/P

V = (30mol)(0.08206 L•atm/mol•K)(273 K)/(1 atm)

V = 672.071 L

The volume of liters of H2 formed is 0.6L

3. The molar concentration of ZnCl₂ is given by the equation:

C = n/V

Here, number of moles is n and the volume is V The number of moles of ZnCl₂ is 30 mol, and the volume is 100 mL, so the molar concentration is:

C = (30 mol)/(0.1L)

C = 300 M

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Answer:

water freezes at 32 degrees Fahrenheit (0 degrees Celsius)

Explanation:

Total heat generated by 2 mole of TiO2(s) is 4.963kJ.

The amount of heat released in the reaction of 2.89 mol of TiO2(s) can be calculated using the following equation: q = nCΔT, where n is the number of moles, C is the specific heat capacity of TiO2, and ΔT is the change in temperature.

The specific heat capacity of TiO2 is 683. 697. J/kgK. and the change in temperature is is 25k. By plugging in the values and converting J to kJ,

q = 2.89 * 25 * 683.697

=> 4963.35

In brief, the amount of heat released by 2.89 mol of TiO2(s) is 4.963kJ.

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Complete question :

determine how much heat (in kj) of 2.89 mol of tio2(s) with a temperature difference of 25k

d is the answer. according to me

Answer:

Li2SO4+H2CO3

Explanation:

put d equation this way

negative ions to positive ions

Answer:

\(3.6 * 10^{7}\)

Explanation:

Hope this helps!

He> F2 > Ar > SF6.

A square root of a gas's molecular weight has an inverse relationship with the rate for effusion of that gas.A gas will effuse faster when it is lighter and more slowly when it is heavier.

In comparison to oxygen, nitrogen has a smaller molar mass.As a result, the rate of nitrogen effusion is greater than that of oxygen effusion.

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There are 16 variable in the equation below with the property it represents. number of moles time power voltage volume molarity .

"number of moles" represents n (the number of moles of a substance)

"time" represents t (time elapsed)

"power" represents P (power, or the rate at which energy is transferred)

"voltage" represents V (potential difference, or voltage)

"volume" represents V (volume)

"molarity" represents M (molarity, or the concentration of a solution)

"N solute" represents N (the number of solute particles in a solution)

"RT" represents RT (the product of the gas constant R and the absolute temperature T)

"MRT" represents MRT (the product of moles (n), the gas constant (R), and absolute temperature (T))

"rate" represents rate (the rate at which a reaction occurs)

"universal gas constant" represents R (the universal gas constant, a physical constant used in equations of state)

"sol" represents solution (a shortened form of "solution")

"osmotic pressure" represents π (osmotic pressure, the pressure that needs to be applied to a solution to stop osmosis)

"absolute temperature" represents T (absolute temperature, temperature measured on the Kelvin scale)

"integer" represents an integer value

"molar mass" represents M (molar mass, the mass of one mole of a substance)

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Label each variable in the equation below with the property which represents. number of moles time power voltage volume molarity N solute RT = MRT rate universal gas constant solution osmotic pressure absolute temperature integer molar mass.

Explanation

Given:

Mass of copper = 5.07 g

Density of copper = 8.96 g/mL = 8960 g/L

Requested: Volume of copper

Solution

p = m/V where p is the density, m is the mass and V is the volume

m = p x V

V = m/p

V = 5.07 g/8.96 g/mL

V = 0.566 mL

Answer

Volume of copper = 0.566 mL

When quenching with acid (HCl) after a reaction between benzophenone and sodium borohydride, the following precautions should be taken: The acid should be added dropwise, the reaction solution should be cooled to room temperature, and a base should be added before adding the acid to make sure the solution is neutral. Therefore, options b, c and d are the correct answers.

In chemistry, quenching refers to the cooling of a hot object in a liquid to stabilize the shape and other physical properties of the object. This process involves cooling a substance down to a level where it can be manipulated without changing shape or other physical characteristics.

However, when quenching with acid, the objective is different. Acid quenching is used to stop chemical reactions or remove unreacted chemicals after a chemical reaction has taken place. It helps to minimize side reactions and/or remove excess reagents.

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• Before the balloon was placed inside the hot water, the pressure was the same inside and outside the balloon. The hot water raised the kinetic energy of the air molecules inside the balloon, expanding the balloon, through thermal expansion.

• (1) the pressure of air inside the balloon increased, (2) the volume of the inside of the balloon increased as well, and (3) the temperature of the balloon increased. Note that pressure and volume are inversely proportional, and pressure and temperature are directly proportional. Therefore as the temperature increases, the pressure inside will increase, causing an increase in the volume. At a certain point though the volume will increase too much as to cause a significant decrease in pressure.

• The air molecules will gain kinetic energy, hence (1) increasing the molecules's speed, and (2) heating the air molecules.

Williamson ether synthesis would give a poor yield of product as the halide is on a 2° carbon. is true about the synthesis of 1-isopropoxy-1-methylcyclopentane.

The Williamson ether synthesis is a method for the synthesis of ethers using an alcohol and an alkyl halide. The reaction proceeds through a nucleophilic substitution mechanism and the ether product is obtained with the alcohol and halide groups in the anti-Markovnikov orientation. The reactivity of the alkyl halides used in this reaction follows the order: primary > secondary >> tertiary. Therefore, the reaction of a secondary halide such as 2° carbon halide will give a poor yield of product as the reactivity of 2° carbon halide is less compared to primary halide. As a result, the reaction is less efficient and the yield of the product is lower.

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Answer:                                                                                                                          

Explanation:

Best describe table sugar is considered a pure substance is Sugar has the same chemical composition throughout

Table sugar is pure sucrose derived from sugar beet or sugar cane and sucrose is the disaccharide consisting of glucose and fructose and it is produced by green plant in the process of photosynthesis and since the chemical composition of sugar is definite and does not vary hence it is pure substance and table sugar refer to standard while white sugar that you see in your cooking baking or cup of tea at home and the scientific name foe table sugar is sucrose

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ANSWER

Option C

EXPLANATION

Given that;

In the reaction above, we have the following data

At the reactants side;

3 atoms of manganese

4 atoms of nitrogen

1 atom of sodium

1 atom of fluorine

At the products side

1 atom of manganese

4 atoms of fluorine

3 atoms of sodium

1 atom of nitrogen

To balance the above equation, apply the law of conservation mass

Law of conservation of mass states that matter can neither be created nor destroyed but can e transformed from one formato another.

To balance the equation, 1 mole of Mn3N4 reacts with 12 moles of Na Tto give 3 moles of MnF4 and 4 moles of Na3N

So, the new equation becomes

The following data can be deduced in the above equation

At the reactants side

3 atoms of Mn

4 atoms of N

12 atoms of Na

12 atoms of F

At the products side

3 atoms of Mn

12 atoms of F

12 atoms of Na

4 atoms of N

Looking atthe vabove data, the number of atoms of each element at the reactants side is equal to the number of atoms of same elements at the products side.

Hence, the correct answer is option Ce

u

Answer: An experimental group, also known as a treatment group, receives the treatment whose effect researchers wish to study, whereas a control group does not

Explanation:

The control group and experimental group are compared against each other in an experiment. The only difference between the two groups is that the independent variable is changed in the experimental group. The independent variable is "controlled" or held constant in the control group

In order to balance a chemical equation steps to be followed are : Identify  atoms on each side.Count  atoms on each side.Numbering  steps for balancing Equations in  sequential order.Use coefficients to increase  atoms on each side.Check to make sure you have  same number of each type of atom on each side.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

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Your question is is incomplete, the complete question will be:

Numbering the Steps for Balancing Equations in a sequential order:

Use coefficients to increase the atoms on each side.

Check to make sure you have the same number of each type of atom on each side.

Count the atoms on each side.

Identify the atoms on each side.

Explanation:

Opposite hemispheres have opposite seasons, no matter the earth's rotation, because of the earth's tilt. The earth's tilt is responsible for all seasons.

Answer:

(K) = [H2] [Cl2]  /  [HCl]²

Explanation:

The equation of the reaction is given as;

2 HCl (g)  ⇔ H2 (g) + Cl2 (g)

The Equilibrium constant is the ratio of the concentration of the products and reactants raised to the power of their coefficients

Products =  H2 and Cl2

Reactants =  HCl

Equilibrium constant (K) = [H2] [Cl2]  /  [HCl]²

The mass of the sample of calcium carbonate when it absorbs 45. 5 J of heat is option B: 5.0 grams.

This is a heat transfer problem The general formula for heat transfer or heat change (as in absorption) is as follows:

Q = m x c x  ΔT

where:

Q = heat absorbed,

m = mass of the substance,

c = specific heat, and

ΔT = change in temperature.

We are already given:

Q = 45.5 J

ΔT is the difference between 28.5 °C and 21.1 °C:

28.5 °C - 21.1 °C = 7.4 °C

c = 0.82 J/g-K

We need to find the mass of the sample or the substance:

m = Q/ c x ΔT

= 45.5 / 0.82 x 7.4

= 5.0 grams

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Answer:

C

Explanation:

When the atoms were cooked they became a solid, or kept being a liquid so the shape of the element would of not changed.

Answer:

c

Explanation:

c first quarter waxing half moon

The following statements on HPLC modes are true is more polar compounds elute first in normal-phase HPLC (Option E).

The liquid chromatography (HPLC) is a technique in analytical chemistry employed for the separation, identification, and quantification of elements. It is considered a highly sensitive method, and it works by separating the components in a mixture with the assistance of a solvent under high pressure.

There are two modes of HPLC: Reversed-Phase HPLC (RP-HPLC) and Normal-Phase HPLC (NP-HPLC). In RP-HPLC, a nonpolar stationary phase, such as C18, is used, and polar solvents, such as water, are used as mobile phases. Polar stationary phases, such as silica gel, are used in NP-HPLC, while nonpolar solvents, such as hexane, are used as mobile phases.

More polar compounds have a greater affinity for the polar stationary phase than less polar compounds, which have a higher affinity for the nonpolar mobile phase in NP-HPLC. As a result, less polar compounds elute first in normal-phase HPLC.

Thus, the correct option is E.

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