How many grams of NO are obtained from 16.1 g NO2 ?

First, let's put the info into symbols:

As the mole fractions have to add up to 1, we can calculate the water mole fraction, substracting:

If we make the supposition that we have 1 mole of the solution, we would have the next quantities of each substance:

Now, we can convert these moles into mass through the molecular weight of each substance:

Now, we can calculate the mass percentage, because we have the mass of the substrate and the mass of the solution (the addition of water and iron (II) bromide):

The answer is that the %m/m of iron bromide in the solution is 44.020%

A single replacement reaction, also known as a single displacement reaction, occurs when one element in a molecule is swapped out for another. Starting ingredients are always pure elements combined with an aqueous compound, such as pure hydrogen gas or zinc metal.

Two pure elements and one aqueous compound or solution are required for all single-replacement reactions. The A and C in the aforementioned reaction would be pure elements. Zn + 2HCl > ZnCl2 + H2 is an example of a single-replacement reaction in detail.

You must make use of a "Activity Series" table to ascertain whether a certain single replacement will take place. A single displacement reaction will take place if the metal or halogen is above the element it would replace according to the activity series.

In a compound, one element takes the place of another to create a new material. The number of reactants and products in a single replacement reaction is equal.

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The equation of the dissociation of the compound is [tex]AgNO_{3} (s)---- > Ag^{+} (aq) + NO_{3^{-} (aq)[/tex]

The term dissociation has to do with the process by which a substance is broken up into its constituents. Now we know that the electrolytes are composed of ions. These ions are the charge carriers that are responsible for the fact that the solution is able to be a conductor of the electric current as we know the electrolytes to be as usual.

We can now write the equation of the dissociation from the equation; [tex]AgNO_{3} (s)---- > Ag^{+} (aq) + NO_{3^{-} (aq)[/tex]. The water has been omitted as was instructed in the question.

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The equation for the dissociation of the electrolyte AgNO₃(aq) is:

[tex]\rm AgNO_3\rightarrow Ag ^+ + NO_3 ^-[/tex]

Dissociation is defined as a broad process in which molecules (or ionic compounds like salts, or complexes) split or separate into different elements like atoms, ions, or radicals, typically in a reversible way.

We now know that ions make up the electrolytes. These ions are the charge carriers that make it possible for the solution to serve as a conductor of the electric current in the manner that we have come to expect from electrolytes.

Thus, the equation for the dissociation of the electrolyte AgNO₃(aq) is:

[tex]\rm AgNO_3\rightarrow Ag ^+ + NO_3 ^-[/tex]

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Answer

Decomposition

Explanation

2CO2(g) → 2CO(g) + O2(g)

The reaction of carbon dioxide to form carbon monoxide and oxygen as shown above is a decomposition reaction.

A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.

In the reaction, a single reactant carbon dioxide breaks down or decomposes to form carbon monoxide and oxygen.

The balanced equation that can be used to fond the heat of formation is;

[tex]Ba(s) + C(s) + \frac{3}{2}O_{2} (g) ----- > BaCO_{3} (s)[/tex]

The heat of formation is defined as the heat that is evolved or absorbed when a substance is formed from its component elements under standard conditions. Note that the components of the equations must be the substances that are in standard form.

In this case, we are trying to see the balanced chemical equation for the reaction used to calculate ΔH∘f of BaCO3(s). We have to know that is equation must have to involved the barium, carbon and oxygen atoms as the barium carbonate compound is formed.

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Step 1

The equation for the boiling point elevation used here:

m = molality, which is calculated as follows:

Kb = boiling constant

-------------------------

Step 2

Information provided:

Solute = C9H8O

Solvent = carbon tetrachloride

Mass of solute = 97.1 mg

(1 g = 1000 mg => 97.1 mg x (1 g/1000 mg) = 0.0971 g)

Mass of solvent = 1.00 g

(1 kg = 1000 g => 1.00 g x (1 kg/1000 g) = 1x10^-3 kg)

---

Information needed:

The molar mass of solute = 132.1 g/mol (please, the periodic table is useful here)

-------------------------

Step 3

The number of moles of solute: n

n = mass of solute/the molar mass of solute = 0.0971 g/ 132.1 g/mol = 7.35x10^-4 moles

----

Molality, m:

m = moles of solute/mass of solvent (kg) = 7.35x10^-4 moles/1x10^-3 kg = 0.735 moles/kg or m

----

The boiling point elevation:

ΔTb = Kb x m = 5.03 °C/m x 0.735 m = 3.69 °C

Answer: ΔTb = 3.69 °C

Answer

A. None of these

Explanation

Gamma rays are ionizing electromagnetic radiation, obtained by the decay of an atomic nucleus. Gamma rays are more penetrating, in the matter, and can damage living cells to a great extent. Gamma rays are used in medicine (radiotherapy), industry (sterilization and disinfection), and the nuclear industry.

Thus, gamma rays are used for all the options given in B - D. So the correct answer is option A. None of these

Answer:

Explanation:

Comment

You have to look around for the best R to use. The problem is that R has different values depending on what the units of the givens are. In this case you have

Givens

V = 45 L

P = 1.01 atmospheres

T = 25 degrees = 25oC + 273 kelvin = 298 degrees kelvin

R = 0.08206 for those givens.

Equation

PV = n * R * T

Solve

1.01 * 45 = n * 0.08206 * 278

n = (1.01 * 45) / (0.08206*278)

n =    1.99    

A balanced chemical equation [tex]Zn (s) Zinc + H_{2} SO _{4 }\ (aq) Sulfuric acid → ZnSO _{4}\ ( aq) Zincsulfate (aq) + H {_2} (g) Hydrogen.[/tex]

Zinc is a transition metal with atomic number 30 and is shown in the periodic table with the symbol "Zn". Zinc is one  of the cheap metals that we  use every day. It is part of the elements that humans have expanded over thousands of years.

Zinc (Zn) is a soft metal with a particularly stable electrical structure (fully filled stable configuration). As a result, their metal joints are weak. They have a high oxidizing power up to  oxidation state 2.

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Answer: calcium is metal and carbon and oxygen is non metal. If you place the chalk in the water there won’t be any chemical reaction

Explanation: Hope my answer is helpful

The unit for volume in W/V% when mass is in grams is mililiters, g/mL, therefore this statement is false

Answer

11302.2 joules

Explanation

Given:

Mass of water = 30.0 g

Initial temperature, T₁ = 10⁰ C

Final temperature, T₂ = 100⁰ C

Increase in temperature, ΔT = T₂ - T₁ = 100⁰ C - 10⁰ C = 90⁰ C

What to find:

The energy in joules required to increase the temperature of the water.

Step-by-step solution:

The joules required to increase the temperature of the water can be calculated using the formula:

q = mcΔT

Where q is the joules of energy required.

m is the mass of water = 30.0 g

c is the specific heat of water = 4.186 J/g ⁰C

ΔT is the temperature rise = 90 ⁰C

∴ q = 30.0 g x 4.186 J/g ⁰C x 90 ⁰C

q = 11302.2 joules

Hence, 11302.2 joules are required to increase the temperature of 30.0 g of water from 10⁰ C to 100⁰ C vapors.

An atom is a complicated configuration of negatively charged electrons grouped around a positively charged nucleus in certain shells. Protons and neutrons make up the majority of the atom's mass in this nucleus (except for common hydrogen which has only one proton).

Fireworks' vibrant colors come from mineral components. Bright greens are produced by barium, deep reds by strontium, blues by copper, and yellow by sodium.

Types ;

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Meiosis starts with half the number of chromosomes as Mitosis = True

The genetic offspring are exactly like the parent call = False

There are 23 chromosomes from each parent cell = True

Meiosis goes through 2 stages of division, meiosis i and ii = True

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Hope this helps!

Have a great day and God bless! :)

3.7 degree celsius

According to ideal gas equation;

where:

• P1 and P2 are the initial and final pressure

• V1 and V2 are the initial and new volume

• T1 and T2 are the initial and final temperature

Given the following parameters

Required

Final temperature T2

Substitute

Therefore the new temperature in Celsius is 3.7 degree celsius

Through the alveoli,  oxygen inhaled through the lungs enter the bloodstream.

The respiratory system is a biological system consisting of certain organs and structures used for gas exchange in animals and plants. The anatomy and physiology that cause it to vary greatly depending on the size of the organism, the environment in which it lives, and its evolutionary history. In terrestrial animals, the respiratory surface is inserted into the mucous membranes of the lungs. Gas exchange in the lungs takes place in millions of tiny air sacs; in mammals and reptiles, they are called alveoli and in birds atrium. These microscopic air sacs have a very rich circulation, which brings the air into close contact with the blood.

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Answer:

the answer is B

Explanation:

because i just choose the answer

Answer: Neils Bohr

Explanation: Development of the Atomic Theory. In 1913, Neils Bohr, a student of Rutherford 's, developed a new model of the atom. He proposed that electrons are arranged in concentric circular orbits around the nucleus. This model is patterned on the solar system and is known as the planetary model.

Answer

2.0 x 10²³ molecules.

Explanation

Given:

The number of moles of theobromide measured out = 0.333 moles.

MM of theobromide = 180.8 g/mol

What to find:

The number of molecules of theobromide the student measured.

To go from moles to molecules, multiply the number of moles by Avogadro's number.

The Avogadro's number = 6.02 x 10²³

1 mole of theobromide contains 6.02 x 10²³ molecules.

So, 0.333 moles of theobromide measured out will have (0.333 x 6.02 x 10²³) = 2.0 x 10²³ molecules.

Ideal gas law is valid only for ideal gas not for vanderwaal gas.  The pressure of 0.032 mole sample of gas is contained in a 1 L container at 23 degrees Celsius is 0.77atm.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically,

PV=nRT

where,

P = pressure=?

V= volume=1 L

n =number of moles= 0.032 mol

T =temperature = 23°C=296K

R = Gas constant = 0.0821 L.atm/K.mol

P × 1 L = 0.032mole× 0.0821 L.atm/K.mol × 296K

P =0.77atm

Therefore,  the pressure of 0.032 mole sample of gas is contained in a 1 L container at 23 degrees Celsius is 0.77atm.

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Both radium and calcium will concentrate on our bones. Suitable statements are A and D Calcium and radium are group 2 elements. Both will concentrate on our bones due to their similar chemical properties.

Radium and calcium are alkaline earth metals, meaning they proportion a number of equal chemical homes due to each in their atom's outer shells containing two valence electrons. although radium is radioactive and calcium isn't, the frame can't distinguish among these factors that appear to act in an identical manner.

The paint contained radium. even as radium is only faintly radioactive, the women were informed to lick their paintbrushes to present the finer points. This led to complaints that had been influential in the early levels of workplace safety law within the U.S.

Young ladies painted face dials with radioactive fabric. Unaware that the paint turned into dangerous, they would locate the brush tip on their lips to acquire a nice point. After being laid low with radium poisoning, numerous younger girls sued their employers and brought national attention to the safety of people.

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[tex] \huge \color{basic}{ \boxed{ \tt{✐Answer:}}}[/tex]

The Radium Girls experienced devastating health outcomes from ingesting radium from their paint brushes. We know that both radium and calcium will concentrate in our bones. Why might this be, and why might radium be damaging to our bones while calcium is not?

Choose ALL correct answers.

☑︎ A. Radium and calcium will both form 2+ cations but radium is more reactive and more unstable.

☐ B. Radium and calcium will both form 2+ anions but radium is more reactive and more unstable.

☐ C. Calcium and radium are period 2 elements. Both will concentrate in our bones due to their similar chemical properties.

☐ D. Calcium and radium are group 2 elements. Both will concentrate in our bones due to their similar chemical properties.

________________________________

The correct answer is letter [tex] \large \bold{A}[/tex]

Answer:

The answer is C) She should drop two balls with different masses from the same height.

Explanation:

Since they want to test the effect of MASS on kinetic energy, they should have different masses but have them both fall from the same height in order to see the difference the mass makes.

A student should drop two balls with different masses from the same height to determine the effect of mass on kinetic energy. Therefore, option (C) is correct.

Kinetic energy (KE) can be described as the energy possessed by a moving body due to its motion. Work will be done when there is a change in the kinetic energy of an object. The kinetic energy is represented as K.E. = ½mv²  where ‘m’ is the mass and ‘v’ is the velocity of the object.

Potential Energy (P.E.) can be defined as the energy stored by an object due to the position of the object and can be written in the form of an equation as P.E. = mgh where ‘m’ is the mass,  ‘h’ is the height in meters and ‘g’ is the acceleration due to gravity.

The kinetic energy of an object depends upon its mass of the object. Therefore, to understand the effect of mass on kinetic energy, drop two balls with different masses from the same height.

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Answer:

2.41 molecules.

Explanation:

hope this helps!

The energy levels from lowest to highest energy is 1s, 2s, 2p, 3s, 3p, 4s, 3d and is therefore denoted as option A.

This is referred to as a fixed distance of electrons from the nucleus of an atom and is the energy an electron has when it is above ground state and starts with the 1s.

The appropriate energy level from the least to the highest is in the order of 1s, 2s, 2p, 3s, 3p, 4s, 3d and they have the distinct number of electrons they contain thereby making option A the most appropriate choice.

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When compounds are heated they undergo physical changes but new molecules created or existing molecules lost. The common things for the given two changes are they both conserve mass and caused by heating.

Physical changes include, change in state or phase of a substance. For example, boiling a liquid converts the liquid state into gaseous state. Similarly melting, crystallization, solidification etc. are physical changes.

During a physical change, no bond making or breaking occurring as well as no molecules or atoms are created. Similarly existing molecules cannot be lost.

According mass conservation law, during a chemical or physical change mass of a substance remains constant. Thus reactants have the same as total mass of products.

Therefore, the two common things in the two changes are they are caused by heating and both conserve mass. Thus, option A and C are correct.

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As per scientific notation rules,scientific notation of 6.0×10^4÷4.0×10^8 value is 1.5×10[tex]^-4[/tex].

Scientific notation is defined as  a way of expressing  numbers which are too large or too small so that they can be easily written in decimal form. It can be referred to the scientific form or the scientific index form  or even the standard form.

Base ten notation is used by scientists, engineers  as it  helps in simplification of arithmetic  operations.  It contains the significant figures  which include all non-zero numbers , the zeroes between significant digits and zeroes which are needed to be significant.

In scientific notation, the base should always be ten. The exponent should be a non-zero integer and it can be either positive or negative.

For example , in the given problem 6.0×10^4=60,000 and 4.0×10^8=40,00,00,000

∴60,000÷40,00,00,000=0.00015 which in scientific notation is expressed as 1.5×10[tex]^-4[/tex]

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To solve this question, we need to use the Clapeyron equation. The Clapeyron equation is a mathematical expression that relates quantities such as pressure (P), volume (V), temperature (T) and the number of particles (n) that make up an ideal gas.

The formula is PV = nRT.

First, let's transform 23.5 grams fo nitrogen gas (N2) into moles using its molar mass and the following formula: moles = mass/molar mass

molar mass of N2 = 28 g/mol

moles = 23.5/28 = 0.839 moles

Now let's use the formula PV = nRT

where:

P = ???

V = 8.5 L

n = 0.839 moles

R = 0.082 atm.L/K.mol

T = 298 K

P x 8.5 = 0.839 x 0.082 x 298

P = 20.51/8.5

P = 2.41 atm

Answer: the pressure is 2.41 atm

To solve this we must know the concept behind the phenomenon of elevation in boiling point when a non volatile solute is added to any solvent, the molar mass of solute is 115.40g

Whenever a non volatile solute is added to a solvent then the boiling point of solvent increases

Mass of solution = volume× density

                             = 25.0 mL×0.997 g/mL

                             =24.925g

                            = 0.024Kg

ΔT= Kb× molality

100.300-100=0.512×m

0.58=m

0.58×0.024=mole

0.013=mole

mass =given mass÷ mole

        = 1.50÷0.013

         = 115.40g

Thus the molar mass of solute is 115.40g

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The step comes after the observation stage in the scientific method

The scientific method is the process of objectively establishing  facts through testing and experimentation. The basic process involves making an observation, formulating a hypothesis, making a prediction, conducting an experiment and finally analysing the results.

7 steps of the scientific methods are  

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