I need some help on this question please!

A chemist has 3.45 x 1022 molecules of P2O5. How many grams of P2O5 does the chemist have?

Thanks to anyone who helps!

Answer:

Zero

Explanation:

Hello,

The question require us to calculate the mass of nitrogen present in aluminium carbonate.

This can easily be calculated using Avogadro's number as a constant with some minor calculations but however in this case, we can't because there's no single atom of nitrogen present in aluminium carbonate hence we can't calculate the mass of nitrogen present in it.

Chemical formula of aluminium carbonate = Al₂(CO₃)₃.

From the above chemical formula, we can see that there's no single atom of nitrogen present in the formula hence the mass of nitrogen present in aluminium carbonate that contains 1.23×10²³ carbon atoms is zero.

Answer:

b. In equilibrium with the liquid phase, the pressure exerted by a gas.

Explanation:

When a liquid is warmed up to a temperature , it starts vaporising . The liquid is turning into gas and gas is turning into liquid at different rates  . Initially the rate of former is higher but gradually the difference of rate between them decreases to zero . At this point the rate of conversion of liquid into gas and rate of conversion of gas into liquid becomes equal  . This is called dynamic equilibrium point .

If we change the temperature , the equilibrium gets disturbed .

At this point the pressure exerted by the gas is called the vapour pressure of the liquid .

So option b ) is correct .

At the equilibrium point, the pressure exerted by the gas molecules to the liquid molecules has been termed the Vapor pressure. Thus, statement b is correct.

The vaporization has been the process of conversion of liquid to the gaseous state with the rise in temperature. The liquids attaining a certain temperature have been vaporized into the gaseous state.

Initially, the gas phase has been less in concentration, thus the rate of formation of gas has been greater.

After a certain amount of time, the gas phase starts to cool down and converts to the liquid state. The rate of formation of the liquid has been slower.

The time when the rate of formation of liquid, and the rate of formation of gas has been equal is termed as the equilibrium point. At the equilibrium point, the pressure exerted by the gas molecules to the liquid molecules has been termed the Vapor pressure.

Thus, statement b is correct.

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Molecular formula of Tartaric Acid is C ₄ H ₆ O ₆ .

As it is given that ,

C = 32 . 04 %

H = 4 . 03 %

O = 63 . 96 %

So , composition in grams is :

C = 32.04 g

H = 4.03 g

O = 63.96 g

Now we have to find no. of moles of each element :

C = 32.04 / 12 = 2.67

H = 4.03 / 1 = 4.03

O = 63.96 / 16 = 3.99

Dividing no. of moles with smallest no. of moles .

For C , 2.67 / 2.67 = 1

For H , 4.03 / 2.67 = 1.5 ≈ 2

For O , 3.99 / 2.67 = 1.49 ≈ 2

So , Empirical formula = C₂ H₃ O₃

E.F. Mass = 24 + 3 + 48 = 75 amu

Molecular  mass = 150 amu

So , n = Molecular  mass / E.F. Mass

      n = 150 /75

      n = 2

So , Molecular formula = ( C H₂ O₂ )n

=  ( C₂ H₃ O₃ ) ₂

= C ₄ H ₆ O ₆

Hence , Molecular formula of Tartaric Acid is C ₄ H ₆ O ₆ .

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Answer:

Na⁺ (aq) + OH⁺ (aq) + H⁺ (aq) + Cl⁻ (aq) → Na⁺ (aq) + Cl⁻ (aq) + H₂O (l)

General Formulas and Concepts:

Atomic Structure

Aqueous Solutions

Stoichiometry

Explanation:

Step 1: Define

NaOH reacting w/ HCl

NaOH is soluble

HCl is soluble

[RxN] NaOH (aq) + HCl (aq) → NaCl (aq) + H₂O (l)

Step 2: Total Ionic Equation

Break up soluble compounds into ionic form.

[T.I.E] Na⁺ (aq) + OH⁺ (aq) + H⁺ (aq) + Cl⁻ (aq) → Na⁺ (aq) + Cl⁻ (aq) + H₂O (l)

The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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The molarity of sodium hydroxide solution is 0.22M when neutralization is done between 25.0 mL sodium hydroxide solution  and  16.7 mL of 0.333 M hydrogen chloride solution.

Titration is a technique by which we know the concentration of unknown solution using titration of this solution with solution whose concentration is known. To know the end point we use phenolphthalein as indicator. End point is a point where completion of reaction happen.

Mathematically,

moles or sodium hydroxide =moles of hydrogen chloride

\(M_{1} V_{1} =M_{2} V_{2}\)

\(M_1\)= molarity of NaOH solution=?

\(M_2\)=molarity of HCL solution= 0.333 M

\(V_1\)= volume of NaOH solution=25.0 mL

\(V_2\)= volume of HCl= 16.7 mL

Substituting all values

=( 0.333 M×16.7 mL)÷25.0 mL

=0.22M

Therefore, the molarity of HCl is 0.22M.

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Answer:

they have the maximum number of valence electrons their outer shell can hold.

Explanation:

Answer:

3.85

Explanation:

Calculate molar mass, starting with each element, then find grams per mole, then convert.

Isotonic solutions restore fluid volume because they fill the tissues and maintain fluid volume more effectively than hypertonic or hypotonic solutions.

Cells are the basic unit of life.

If a cell is placed in an isotonic solution, there will be no net flow of water into or out of the cell, and the cell's volume will remain stable.

If the solute concentration outside the cell is the same as inside the cell, and the solutes cannot cross the membrane, then that solution is isotonic to the cell.

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The ink dyes that travel to the top of the paper have a greater affinity for the mobile phase than the stationary phase whereas the other ink dyes that remained near the bottom of the paper have a greater affinity for the stationary phase than the mobile phase.

Chromatography is the process by which molecules of colored subtances such as dyes are separated based o their affinity for a particular solvent or solid phase as well as based on their molecular weights.

Chromatography separates substances based on differences in their physical properties.

In a chromatographic setup, there are two phases:

In the given chromatographic separation process, the dye to be separated is applied o the stationary phase and a mobile phase is allowed to move over the dye.

The particles of the dye are separated based on their affinity for either the stationary or mobile phase.

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Answer:

A. Quantitative data.

Explanation:

Quantitative data involves specific numbers, while qualitative verbally describes something.

Answer:

Concentration of the sugar in the solution increases

Answer:

The sugar molecules will begin to crystallize back into a solid at the least provocation

The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A

In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).

When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.

Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.

In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.

The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A

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B Five Is the correct answer

mark me as brilliant

Answer:

or reactions that are not at equilibrium, we can write a similar expression called the reaction quotient QQQ, which is equal to K_\text cK

c

​

K, start subscript, start text, c, end text, end subscript at equilibrium.

Explanation:

Answer:

I think it's thermal, as it is affected by temperature

Answer:

92.4%

Explanation:

The volume per cubic meter of sodium preoccupy by the sodium ions is

\(V_{Na} = n \times V\)

where;

volume (V) of each Na atom   = \(\dfrac{ 4}{3} \pi r^3\)

Radius of each ion = 97.3 pm = 97.3 × 10⁻¹²

no.of atoms in the sample n =  mass of the sample / ( molar mass / NA)

mass of the sample per cubic metre =  911 kg/m³

∴

\(V = \bigg [ \dfrac{4}{3} \pi r^3 \bigg ] \bigg [\dfrac{MN_A}{m} \bigg ]\)

\(V = \bigg [ \dfrac{4}{3} \pi (97.3 \times 10^{-12} )^3 \bigg ] \bigg [\dfrac{ (911 kg/m^3 (m^3))(6.023\times 10^{23})}{27.7 \times10^{-3}\ kg/mol } \bigg ]\)

V = 0.07643 m³

The fraction of available conduction electrons are;

= (1 - V)

= 1 - 0.07643

= 0.92357

≅ 92.4%

The volume of air you might inhale (and exhale) in 8.00 hours is approximately 1903.2 liters.

To calculate the volume of air you might inhale (and exhale) in 8.00 hours, we need to determine the total number of breaths you take in that time and then multiply it by the volume of each breath.

First, let's calculate the number of breaths in 8.00 hours:

Number of breaths per minute = 13

Number of breaths per hour = 13 breaths/minute * 60 minutes/hour = 780 breaths/hour

Number of breaths in 8.00 hours = 780 breaths/hour * 8.00 hours = 6240 breaths

Now, let's calculate the volume of air in liters:

Volume of each breath = 0.305 liters

Volume of air inhaled and exhaled in 8.00 hours = Volume of each breath * Number of breaths in 8.00 hours

Volume of air inhaled and exhaled in 8.00 hours = 0.305 liters/breath * 6240 breaths = 1903.2 liters

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Answer:

H2 + I2 --> 2HI

Explanation:

The two reactants are diatomic molecules because they contain two atoms of the same element. Therefore, they would need to have a subscript of "2" next to their symbols.

When balancing an equation, you want the same amount and type of atoms on both sides. By adding a coefficient of "2" in front of the product, two H's and two I's are now on both sides.

Answer:

See explanation

Explanation:

From the analysis we have in the question, we must look towards a first row transition metal ion having a d^6 configuration because it yields a paramagnetic complex having four unpaired electrons and a diamagnetic complex having no unpaired electrons.

We have two possible candidates in mind, Fe^2+ and Co^3+. However, Fe^2+  does not form as many coloured complexes as stated in the question so we have to eliminate that option.

We are now left with only Co^3+. Various ligands are going to cause these various colours of Co^3+ to appear in solution.

Hence, we can deduce from all these that the nature of ligands determines the colour of the complex . Don't forget that the colour of a complex arises from crystal field splitting.

As per the temperature, the molecules of a substance act differently. The melting point is -114.2 °C and The boiling point of hydrogen chloride (HCl) is -85.05 °C. The correct sketch in each set is as follows:

Thus, if the temperature is kept above  -85.05 °C, the molecules will be placed widely apart and will be in the gaseous state, revealing their properties.

If the temperature is between -114.2 °C and -85.05 °C, the molecules will be organized in layers capable of slipping over one another since they will be in a liquid state.

At last, the molecules will be arranged in an orderly manner because they will be in a solid state if the temperature is below -114.2 °C.

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The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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Answer:the process of dissovlving makes the ecectrons in their atoms more closely bound

Explanation:

thats what my lesson said

The solution of water and salt are good conductor of electricity because the process of dissolving makes the electrons in their atoms free to move.

The correct option is (A).

Pure water and salt are bad conductor of electricity.

But the solution of water and salt is a good conductor because when a salt's dissociated it's ions are free to move about in solution when it dissolves, allowing a charge to flow freely.

Because it includes ions, the resulting solution will conduct electricity.

Thus, option (A) the process of dissolving makes the electrons in their atoms free to move, that's why the solution of water and salt are good conductor of electricity.

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Answer:

~ Probeware can collect large amounts of data in a short amount of time.

~Probeware can display data quickly.

~Probeware can collect data that is very precise.

Probeware can be used to map all parts of the universe. WRONG.WRONG.

~Probeware can store large amounts of data in a small space.

~Probeware can analyze data

Answer:

Protons are positive, electrons are negative, neutrons have to charge. Most of an Atoms mass comes from its protons and neutrons

Explanation:

I took some notes in my notebook about Atoms.

The gas law that explains the phenomenon of a weather balloon increasing in volume when heated from room temperature (25 °C) to 58 °C is Charles' Law, also known as the law of volumes. option(d)

Charles' Law states that the volume of a given amount of gas is directly proportional to its temperature, assuming constant pressure and amount of gas. According to this law, when the temperature of a gas increases, its volume also increases, and vice versa, provided that other factors remain constant.

In the case of the weather balloon, as it is heated from room temperature (25 °C) to 58 °C, the temperature of the gas inside the balloon increases. According to Charles' Law, this increase in temperature causes the volume of the gas to expand or increase. This is because the gas particles gain kinetic energy with an increase in temperature, leading to more frequent and energetic collisions with the balloon's walls, which results in an expansion of the gas and an increase in volume.

On the other hand, Gay-Lussac's Law describes the relationship between the pressure and temperature of a gas, while Boyle's Law relates the pressure and volume of a gas. The Combined Gas Law combines the three gas laws (Boyle's Law, Charles' Law, and Gay-Lussac's Law) to describe the relationships between pressure, volume, and temperature for a given amount of gas.

Charles' Law explains the phenomenon of a weather balloon increasing in volume when heated, as it describes the direct relationship between the volume and temperature of a gas under constant pressure and amount. option(d)

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ANSWER

The mass of water formed is 28.52 grams

EXPLANATION

Given information

The volume of oxygen = 4.2L

The pressure = 5.0 atm

The temperature = 323.1K

To find the mass of H2O produced, follow the steps below

Step 1: Find the mole of oxygen using the ideal gas equation

Where

P = 5.0 atm

T = 323.1K

V = 4.2L

Step 2: Substitute the given data into the formula in step 1

From the calculations above, the number of moles of oxygen is 0.792 mole

Step 3: Find the number of moles using a stoichiometry ratio

From the reaction above, 1 mole of oxygen will produce 2 moles of water

Let x represents the number of moles of water

The moles of water is 1.584 moles

Step 4: Find the mass of water using the below formula

Recall, that the molar mass of water is 18.0 g/mol

Hence, the mass of water formed is 28.52 grams

Mass of iron(ll) oxide= 616.608 g

Given

Reaction

2Fe+O2 -->2FeO

479.6 grams of iron

Required

mass of iron(ll) oxide

Solution

mol of iron :

= mass : Ar Fe

= 479.6 g : 56 g/mol

= 8.564

From the equation, mol FeO :

= 2/2 x mol Fe

= 2/2 x 8.564

= 8.564 moles

Mass of iron(ll) oxide :

= mol x MW

= 8.564 x 72 g/mol

= 616.608 g