What is the density of nitrogen gas at 67.3 °C and 0.288 atm?

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore, the average atomic mass of copper is 63.55amu.

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)

Substituting the given values, we get

Average atomic mass=(  62.96  amu × 70.5% )+(64.96 amu ×29.5% )

Average atomic mass=55.58+12.27

Average atomic mass=63.55amu

Therefore, the average atomic mass of copper is 63.55amu.

To learn more about mass, here:

https://brainly.com/question/28704035

#SPJ1

Answer:

Explanation:

The velocity of electrons can be calculated using the equation v = h / (mλ), where h is Planck's constant (6.63 x 10^-34 Js), m is the mass of the electron, and λ is the wavelength of the radiation.

For sodium, the electron energy is given as Φ = 4.41 × 10–19 J. To find the velocity of the electrons, we first need to convert the energy into wavelength using the equation λ = hc / Φ, where c is the speed of light (3 x 10^8 m/s).

So, for sodium:

λ = hc / Φ = 6.63 x 10^-34 x 3 x 10^8 / 4.41 x 10^-19

λ = 290 nm.

And then using the velocity equation,

v = h / (mλ) = 6.63 x 10^-34 / (9.11 x 10^-31 x (290 x 10^-9))

For potassium, the electron energy is given as Φ = 3.68 × 10–19 J, and the wavelength can be calculated in the same way as for sodium:

λ = hc / Φ = 6.63 x 10^-34 x 3 x 10^8 / 3.68 x 10^-19

λ = 290 nm.

And then using the velocity equation,

v = h / (mλ) = 6.63 x 10^-34 / (9.11 x 10^-31 x (290 x 10^-9))

Note: m is the mass of an electron, which is 9.11 x 10^-31 kg.

So, both the velocity of the electrons from sodium and potassium would be the same, given that they are both exposed to the same wavelength radiation of 290 nm.

Answer:The velocity of electrons from sodium and potassium can be calculated using the equation E=hf, where E is the energy of the electron, h is Planck's constant and f is the frequency of the radiation.

From the equation E=hf, f can be calculated using the wavelength of the radiation:

f = c/λ

where c is the speed of light.

Then, using E=hf and the values for E (Φ) for sodium and potassium, the velocity of the electrons can be calculated using the equation:

v = sqrt(2E/m)

where m is the mass of the electron.

Explanation:

The velocity of electrons from sodium and potassium can be calculated using the equation E=hf, where E is the energy of the electron, h is Planck's constant and f is the frequency of the radiation.

From the equation E=hf, f can be calculated using the wavelength of the radiation:

f = c/λ

where c is the speed of light.

Then, using E=hf and the values for E (Φ) for sodium and potassium, the velocity of the electrons can be calculated using the equation:

v = sqrt(2E/m)

where m is the mass of the electron.

Beta decay will occur in isotopes with a N/Z ratio greater than 1, which translates to an overabundance of neutrons.

Beta decay produces a new element that has one more proton and one fewer neutron while alpha decay produces a new element with some less protons and two fewer neutrons. When a nucleus from a higher energy state descends to a lower energy state and releases the excess energy through to the emission of high energy photons, this process is known as gamma decay.

Any one of three radioactive disintegration processes known as beta decay occurs when some unstable atoms spontaneously release surplus energy and undergo a shift in one unit of positive ions without changing their mass number.

To know more about Beta decay, visit:

brainly.com/question/13174032

#SPJ1

A black precipitate is formed by the reaction; Li2S(aq) + Pb(NO3)2(aq) ------> PbS(s) + 2LiNO3(aq) and K2S(aq) + Sn(NO₃)₄(aq)→ SnS(s) + KNO₃(aq)

In a twofold decomposition reaction, the cations swap out their anion companions to form the final product. A precipitate can sometimes be produced by a twofold decomposition reaction.

A precipitate is a solid byproduct of an aqueous species reaction.

Hence, a black precipitate is formed by the reaction; Li2S(aq) + Pb(NO3)2(aq) ------> PbS(s) + 2LiNO3(aq) and K2S(aq) + Sn(NO₃)₄(aq)→ SnS(s) + KNO₃(aq)

Read more about decomposition reaction here:

https://brainly.com/question/27300160

#SPJ1

Insoluble sulfide compounds are generally black in color.

Which of the following combinations could yield a black precipitate?

Na2S(aq)+KCl(aq)

Li2S(aq)+Pb(NO3)2(aq)

Pb(ClO3)2(aq)+NaNO3(aq)

AgNO3(aq)+KCl(aq)

K2S(aq)+Sn(NO3)4(aq

Answer :Hydrophobicity is measured in terms of the contact angle of the water drops to the surface of textiles

Explanation:

The number of moles of hydrogen gas produced from 1.2 g of water is 0.06 moles. Then, the partial pressure of hydrogen gas is 4.9 atm.

The partial pressure of a gas in a mixture is the contribution of the gas to the total pressure of the mixture.

The molar mass of water = 18 g/mol

mass = 1.2 g

number of moles  = 1.2/18 =0.06 moles.

now the total pressure p = nRT/v

V = 0.20 L

T = 30°C =303 K

then  p = (0.06 mol × 0.082 L atm/ K mol × 303 K) / 0.20 L = 7.4 atm.

Now, 2 moles of water gives 2 moles of hydrogen gas and one mole of oxygen. Then 0.06 moles of water gives 0.06 moles of hydrogen and 0.03 moles of oxygen.

Then, mole fraction of hydrogen = 0.06/(0.03 + 0.03) = 0.66.

Partial pressure of hydrogen = total pressure × mole fraction

= 0.66 × 7.4 atm = 4.9 atm.

Therefore, the partial pressure of hydrogen gas is 4.9 atm.

Find more on partial pressure :

https://brainly.com/question/13199169

#SPJ1

Mole is one of the International System of Units' seven foundation units, in reality (SI). Units are created when preexisting ones are insufficient. Therefore, 11.2moles of NO[tex]_2[/tex] is produced.

Simply put, a mole is a measuring unit. It's one of the International System of Units' seven foundation units, in reality (SI). Units are created when preexisting ones are insufficient.

At the same time that using official figures of atoms, molecules, or ions would be unclear, chemical reactions frequently occur at low concentrations where using grams would've been inappropriate. Therefore, the mole was created by scientists to fill the gap between extremely small and extremely huge quantities.

2N[tex]_2[/tex]O[tex]_5[/tex](g)→4NO[tex]_2[/tex](g)+O[tex]_2[/tex](g)

moles of N[tex]_2[/tex]O[tex]_5[/tex] = 5.6 mol

the mole ratio between N[tex]_2[/tex]O[tex]_5[/tex] and NO[tex]_2[/tex] is 1:2

moles of NO[tex]_2[/tex] = 2× 5.6=11.2moles

Therefore, 11.2moles of NO[tex]_2[/tex] is produced.

To learn more about mole, here:

https://brainly.com/question/14676971

#SPJ1

Ca(C2H3O2)2 has 30.41% carbon by volume, according to calculations.

By dividing the atomic mass of the element by the molar mass of the compound, then by 100%, one can get the percentage of the element in a compound.

The percentage form of the mixture is obtained by multiplying this ratio by 100.

By dividing the atomic mass of the element by the molar mass of the compound, then by 100%, one can get the percentage of the element in a compound.

Atomic mass of C divided by the molar mass of Ca(C2H3O2) yields the percentage of carbon.

₂ × 100%

Ca(C2H3O2)2 has an atomic mass of 40 plus (24 plus 3 plus 32).

2 = 158g/mol \s % C = 12.01(4)/158 × 100 \s % C = 30.41%.

To learn more about percentage composition refer to:

brainly.com/question/11952337

#SPJ1

a. 225.0 has 4 significant figures.

b. 1000.0 has 4 significant figures.

c. 0.0003210 has 6 significant figures.

d. 0.0067 has 4 significant figures.

e. 1,000,000 has 7 significant figures.

f. 2.00001 has 6 significant figures.

Question 2

a. 15.9994 rounded to three significant figures is 16.0.

b. 1.0080 rounded to three significant figures is 1.01.

c. 0.6654 rounded to three significant figures is 0.665.

d. 4885 rounded to three significant figures is 4885.

e. 87,550 rounded to three significant figures is 88,000.

f. 0.027225 rounded to three significant figures is 0.0272.

Question 3

a. 77.981 x 2.33 = 181.081 (rounded to 3 significant figures)

b. 4 x 0.0665 = 0.266 (rounded to 3 significant figures)

c. 17,344,900 + 23.1 = 17,344,923.1 (rounded to 7 significant figures)

d. 9.80 - 4.762 = 5.038 (rounded to 3 significant figures)

e. 3.9 x 6.05 x 420 = 8,595.89 (rounded to 2 decimal places)

f. 14.1 / 5 = 2.82 (rounded to 2 decimal places)

g. 1001 + 16.23 = 1017.23 (rounded to 4 significant figures)

h. 424.5 + 2.8461 = 427.3461 (rounded to 4 decimal places)

i. 9.9 - 9.54 = 0.36 (rounded to 2 decimal places)

j. 7.3778 / 0.000265 = 27,864.345 (rounded to 3 decimal places)

k. (24.358) x (6.4) = 156.3712 (rounded to 4 decimal places)

(48.6) x (0.6959) = 33.88594 (rounded to 5 decimal places)

Significant figures of a number in positional notation are described as digits in the number that are reliable and necessary to indicate the quantity of something.

Decimal places on the other hand are described as positions of the digits to the right of a decimal point. Rounding numbers to decimal places is shortening a decimal number to a given degree of accuracy.

Learn more about Significant figures at:  https://brainly.com/question/24630099

#SPJ1

A + BC → AB + C "single replacement reaction" while ammonia synthesis is a "synthesis reaction".

A single replacement reaction is a reaction by which one element replaces an/another element in a compound.

It can be represented generically as: A + B-C → A-C + B This will most often occur if A is more reactive than B, thus giving a more stable product.

A chemical reaction known as a synthesis occurs when two or more simple chemicals combine to create a more complex result. The result is always a chemical, while the reactants can be either elements or other compounds.

Example: ammonia synthesis,

N₂ + 3H₂ ⇄ 2NH₃

Read more about ammonia here:

https://brainly.com/question/14854495

#SPJ1

Equations are balanced using the idea of chemical reactions. to ensure that the reactant side and product side are in equilibrium the steps are below

Balancing chemical equations means making sure that the same number of atoms of each element are present on both sides of the equation. Here are the steps to balance a chemical equation:

It's important to keep in mind that the coefficients should be kept in their lowest whole number ratios, and you can use fractional coefficients if necessary. If the equation is already balanced, no further action needs to be taken.

Lean more about chemical equations at:

https://brainly.com/question/11231920

#SPJ1

Lewis structures are useful for visualizing both ionic and covalent bonds. In the idealized ionic bond.

In covalent bonding, nonmetallic elements part electrons so that both elements can have a full valence shell. Covalent bonds can be meant with electron dot formulas. These are often mentioned as Lewis structures and are a little different than the electron dot formulas used to constitute ionic bonds.

Lewis one atom gives up an electron to the other, forming positive and negative ions. The state for bonds is that the total structure charge is zero and that each atom must have a gentle gas electron configuration. In covalent combination, the Lewis Dot Structures must show

So we can conclude that Using Lewis structure Symbols to relate Covalent Bonding.

Learn more about Lewis's here: https://brainly.com/question/28353159

#SPJ1

The heat of solution for 10.5 g of potassium perchlorate dissolved in 113.8 mL of water is approximately -83.99 kJ/10.5 g.

The heat of solution is described as the enthalpy change associated with the dissolution of a substance in a solvent at constant pressure resulting in infinite dilution.

For 10.5 g of potassium perchlorate dissolved in 113.8 mL of water, the amount of heat released can be estimated as follows:

-599 kJ/mol x (10.5 g / 138.55 g/mol) = -44.31 kJ

-548 kJ/mol x (10.5 g / 138.55 g/mol) = -39.68 kJ

The heat of solution for potassium perchlorate will then be calculated as the sum of the lattice energy and heat of hydration which gives us that

Heat of solution = -44.31 kJ + -39.68 kJ = -83.99 kJ/10.5 g

Learn more about heat of solution  at: https://brainly.com/question/28169738

#SPJ1

Answer: 33.2 micrograms

Explanation:

We are going to convert grams to micrograms.

Step 1

Determine the conversion factors to use for converting grams to micrograms.

1 gram = 1000 milligrams

1 milligram = 1000 micrograms

Step 2

Use the number in the problem and the conversion factors to set up the problem so all conversion factors cancel except micrograms.

3.32 x 10⁻⁵ grams x (1000 milligrams/1 gram) x (1000 micrograms/1 milligram) = 33.2 micrograms/1 = 33.2 micrograms

Note that grams and milligrams cancel and you are left with micrograms. The given quantity 3.32 x 10⁻⁵ grams has 3 significant figures, so the final answer should have 3 significant figures too.

Explanation:

The atomic mass of gallium for this location can be calculated using the following formula:

Atomic mass = (69^Ga abundance x 69^Ga mass) + (71^Ga abundance x 71^Ga mass)

Plugging in the values:

Atomic mass = (0.6011 x 68.7200 amu) + (0.3989 x 70.9200 amu) = 41.4762 amu + 28.2957 amu = 69.7719 amu

Therefore, the atomic mass of gallium for this location is 69.77 amu.

The ion concentration of 0.05 M [tex]CaCl_2[/tex] would be 0.05 mol Ca ions and 0.1 mol Cl ions respectively.

[tex]CaCl_2[/tex] contains two ions according to the following equations:

[tex]CaCl_2 -- > Ca^{2+} + 2Cl^-[/tex]

1 mole           1 mole   2 moles

0.05 M CaCl2 contains 0.05 moles of the solute in 1 liter of the solution. Thus, the equivalent mole of Ca ion would be 0.05 moles while that of Cl ion would be 0.10 mole (0.05x2).

Concentration of Ca ions = 0.05 moles

Concentration of Cl ions = 0.05 x 2 = 0.010 moles

In other words, the ion concentrations of 0.05 M CaCl2 would be 0.05 moles of Ca ions and 0.10 moles of Cl ions.

More on ion concentrations can be found here: https://brainly.com/question/12726151

#SPJ1

4.4 a. The metal that the main part of the garden fork has been made from is iron. The correct option is B

b. The chemical name for rust is hydrated iron (iii) oxide

c. One way of preventing the fork from rusting is by painting the fork.

4.5 Based on the given equations;

a. the equation that produces a metal oxide is equation D.

b. the equation that is a neutralization reaction is equation B.

c. the equation that is a burning reaction is equation A.

The complete equation for the given equations are:

d. sodium + water → sodium hydroxide + hydrogen

e copper carbonate + sulfuric acid → copper sulfate + carbon dioxide + water

f. sulfur + oxygen → sulfur dioxide

Rust is an iron oxide, a typically reddish-brown oxide created when iron and oxygen react catalytically with moisture from the air or water.

Iron(III) oxide-hydroxide and hydrated iron(III) oxides make up rust, which is often linked to the corrosion of refined iron.

Learn more about rust at: https://brainly.com/question/688285

#SPJ1

One mole or 12 g of carbon reacts with one of oxygen molecule weighs 32 g will produce one mole of carbon dioxide. One mole of carbon dioxide weighs 44 g.

Carbon dioxide is an inorganic gas formed by the covalent bonding between carbon and oxygen gas. Carbon dioxide is an essential gas to maintain the living atmosphere in earth.

The balanced chemical equation of the reaction between oxygen gas and carbon is given below:

[tex]\rm C+O_{2} \rightarrow CO_{2}[/tex]

As per this equation, one mole of carbon reacts with one mole of oxygen gas:

Atomic mass of carbon = 12g

molecular mass of oxygen = 32 g

then molar mass of carbon dioxide = 32+ 12 = 44 h=g.

Therefore, 44 g of carbon dioxide is produced in this reaction.

Find more on CO₂:

https://brainly.com/question/29827893

#SPJ1

The mass of sulfur in a sample of CaSO4 with a mass of 67.0 g would be 15.73 grams.

11.5 grams of CaSO4 contains 3.39 grams of Ca and 5.41 g of O.

Mass of sulfur = 11.5 - (3.39 + 5.41) = 2.7 grams

11.5 grams of CaSO4 contains 2.7 grams of sulfur. The mass of sulfur in 67.0 grams of CaSO4 can be estimated as:

11.5 grams CaSO4 = 2.7 grams S

67.0 grams CaSO4  = 67.0 x 2.7/11.5

                                 = 15.73 grams

In other words, if 11.5 grams of CaSO4 contains 2.7 grams of S, then 67.0 grams will contain 15.73 grams of sulfur.

More on dimensional analysis can be found here: https://brainly.com/question/30303546

#SPJ1

Newton's first law states that unless acted on by an unbalanced force, an object will remain at rest or move at a constant speed in a straight line. To move the book on your desk, Newton's first law requires an unbalanced force.

The First Law of Motion of Newton (Inertia) Unless acted on by an unbalanced force, an object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line.

When an unbalanced force acts on an object, the object's motion changes. The object's speed or direction may change. Friction is a force that opposes motion or the tendency for motion between two objects in contact.

Thus, an object will remain at rest or move at a constant speed in a straight line.

To learn more about the Newton's first law, follow the link;

https://brainly.com/question/15280051

#SPJ1

The liquid in Titan's lake is believed to be composed of liquid methane and ethane, which are thought to be supplied by geological processes such as cryovolcanism and seepage from the surrounding terrain. Over time, the liquid in Titan's lake can evaporate, change due to geological or meteorological processes, or be affected by the changing seasons on the moon.

The half equation for this reaction is 2H2 + O2 = 2H2O and this is reduction because it is taking place in cathode.

Does cathode or anode decrease occur?

Although the direction of spontaneous electron flow in galvanic cells may be reversed in electrolytic cells, the definitions of cathode and anode where reduction takes place at the cathode and oxidation happens at the anode remain the same.

Which ions undergo cathodic reduction?

The positively charged ions will migrate toward the cathode after becoming reduced by receiving electrons. Since positive ions pick up electrons at the negative cathode, reduction takes place there.

Know more about cathode- brainly.com/question/2349926

#SPJ1

In nature, oxygen exists as a molecule. To create dioxygen, or O2, two oxygen atoms must make a covalently double bond with one another. Typically, oxygen exists as a molecule. It has the name dioxygen.

Its original definition, "the simplest form of a substance which still maintains the properties of the that substance," was intended to be encompassed by this name. "An atom is a body that can't be cut in 2; a molecule is the littlest portion of the a particular substance," wrote James Maxwell in 1873 when defining atom and molecule. Since ...

According to the contexts, this word might or might not include ions that meet this requirement. A molecule is a collection of atoms that are held together by the force of attraction known as chemical bonds.

To know more about molecule visit:

https://brainly.com/question/19556990

#SPJ1

Photosynthesis is the process in which plants use sunlight, water, and carbon dioxide to make oxygen and energy in the form of sugar. During each step of photosynthesis that is Sunlight absorption, Light-dependent reactions, Light-independent reactions explain in below description.

Sunlight absorption: Special pigments in photosynthetic cells absorb light energy. Plant pigment molecules absorb light with wavelengths ranging from 400 nm to 700 nm. This wavelength range is known as photosynthetically active radiation (PAR).

Light-dependent reactions: Light energy is used in light-dependent reactions to create two molecules required for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. Light reactions occur in the thylakoid membranes of chloroplast organelles in plants.

Light-independent reactions: Photosynthesis's light-independent reactions occur within the stroma. It contains enzymes that, in collaboration with ATP and NADPH, "fix" carbon from carbon dioxide into molecules that can be used to make glucose. The stroma also stores the chloroplast's own genetic material.

Thus, These are the steps of photosynthesis.

To learn more about the photosynthesis, follow the link;

https://brainly.com/question/29775046

#SPJ1

The intermolecular force present in butter is London dispersion forces. In kerosene, covalent bonding between carbon and hydrogen atoms are present.

Intermolecular forces are force exerted between two molecules which can be of attraction or repulsion. The intermolecular force of attraction make the atoms binded in a compound or molecule.

In butter, the hydrocarbon molecules exerts a London dispersion forces between two non-polar molecules. In kerosene, the hydrocarbon molecules are bound by covalent bonding between carbon atoms.

In ethanol, the OH group make it possible to form hydrogen bonds between ethanol molecules. In the case of calcium fluoride, dipole, dipole forces exists. Since the compound is ionic and have a permanent dipole moment.

Find more on intermolecular forces:

https://brainly.com/question/9007693

#SPJ1

The osmotic pressure of the protein solution is given 3.54 torr or 0.004 atm. Then, the molar mass of the protein is 7222 g/mol.

The pressure required to stop the flow or diffusion of  solvent molecules through a semipermeable membrane is called osmotic pressure. The osmotic pressure is represented as π and is related to the pressure, volume and number of moles as follows:

π  = n RT

given π = 3.54 torr = 0.004 atm

volume v = 23 ml  = 0.023 L

temperature = 27 °C = 300 K

R = 0.082 L atm/ K mol

then, n = π V/RT

n = 0.004 atm ×0.023 L /(0.082 L atm/ K mol × 300 K)

  = 3.69× 10⁻⁹.

weight of the protein sample = 26.75 mg = 0.026 g

then, molar mass =   0.026 g/ 3.69× 10⁻⁹mol  = 7222 g/mol

Therefore, the molar mass of the protein sample is 7222 g/mol.

Find more on osmotic pressure :

https://brainly.com/question/15501096

#SPJ1

The molecular weight of the ascorbic acid (vitamin C), given that 0.9 g of the acid was dissolved in 95 g of water is 170.7 g/mol

We'll begin by obtaining the mole of the ascorbic acid in the solution. Details below

Mole = Molality × mass of water (in kg)

Mole of ascorbic acid = 0.0555 × 0.095

Mole of ascorbic acid = 0.0052725 mole

Finally, we shall determine the molar mass of the ascorbic acid. Details below

Molar mass = mass / mole

Molar mass of ascorbic acid = 0.9 / 0.0052725

Molar mass of ascorbic acid = 170.7 g/mol

Learn more about molar mass:

https://brainly.com/question/15874532

#SPJ1

False, using changes in tempo and dynamics can make a musical cliché more effective. Hence, option C is correct.

Tempo in a music refers to pace of the music especially in high pitch sound waves. The most common unit of measurement for tempo is beats per minute (BPM), which is just the quantity of beats that may be captured in a minute at a certain pace.

A musical segment or composition is slower when the beats per minute  is lower than when the BPM is greater. While a higher BPM is more likely to make the listener feel excited, a lower BPM is more likely to have a calming and/or sad effect on the listener.

Changing dynamics is some more effective way to make musical cliché. Hence, option C is correct.

Find more on musical tempo:

https://brainly.com/question/29574317

#SPJ1

The true statements are;

The reaction is endothermic

Heat is a reactant

ΔHrxn is 89 kJ/mol

Enthalpy is a thermodynamic property that represents the total energy of a system, including both its internal energy (the energy of its constituent particles) and the energy it has due to its temperature and pressure. It is commonly used in energy analysis and heat transfer calculations and is expressed in units of joules (J) or calories (cal).

We know that the enthalpy of the reaction can obtained from;

Enthalpy of the products - Enthalpy of the reactants

ΔH reaction = 2(-391.4) - 2(-435.9)

(-782.8) - (-871.8)

= 89 kJ/mol

Learn more about enthalpy: https://brainly.com/question/13996238

#SPJ1