a block has a mass of 4.465 g ad a volume of 144.2cm3 calculate the density in g/cm3

Protons, which are positively charged, and neutrons, which have no electric charge, make up the very dense core nucleus of an atom.

"An atomic nucleus contains protons, which have positive charges," In reality, the protons and neutrons that make up an atomic nucleus are called nucleons. The charge of an atomic nucleus is mostly determined by the positive charge of the protons because neutrons are neutral or have no charge.

The smallest, indivisible unit that makes up the substance that gives rise to all chemical elements is referred to as an atom. As a result, atoms are frequently thought of as the basic units of matter, the structure of which defines the nature of a chemical element.

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The stoichiometric ratio of NaHCO₃ to CH₃COOH, which is determined by the balancing equation, is 1:1, meaning that 1 mole of NaHCO₃ reacts with 1 mole of CH₃COOH.

Acetic acid (CH₃COOH), a component of vinegar, interacts with sodium bicarbonate (NaHCO₃) in baking soda to produce water, carbon dioxide gas, and sodium acetate.

CO₂(g) + H₂O(l) + NaC₂H₃O₂ = NaHCO₃(aq) + HC₂H₃O₂(aq) when yellow bubbles appear, an acidic gas H₂CO₃ has generated as a result of the reaction between CO₂ and water. The salt in the solution (NaC₂H₃O₂) is basic since the solution is red in colour.

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Answer:3.6 X 10-4 g

Explanation:

2.7 X 10^18 X (1 mole / (6.02 X 10^23) X ( 80.912 g / 1 mole) = 3.629 X 10-4 g HBr.  If needed to correct Sig Figs 3.6 X 10-4 g HBr

Answer:

The male cones appear on the trees in the spring time.  The male cones are smaller than the female cones that we typically think of when we think of pine cones.  These cones are softer and are only on the trees in the spring.  After they release their pollen they die away and disappear.

Explanation:

Answer:

\(Keq=11.5\)

Explanation:

Hello,

In this case, for the given reaction at equilibrium:

\(CO (g) + 2 H_2(g) \rightleftharpoons CH_3OH (g)\)

We can write the law of mass action as:

\(Keq=\frac{[CH_3OH]}{[CO][H_2]^2}\)

That in terms of the change \(x\) due to the reaction extent we can write:

\(Keq=\frac{x}{([CO]_0-x)([H_2]_0-2x)^2}\)

Nevertheless, for the carbon monoxide, we can directly compute \(x\) as shown below:

\([CO]_0=\frac{0.45mol}{1.00L}=0.45M\\\)

\([H_2]_0=\frac{0.57mol}{1.00L}=0.57M\\\)

\([CO]_{eq}=\frac{0.28mol}{1.00L}=0.28M\\\)

\(x=[CO]_0-[CO]_{eq}=0.45M-0.28M=0.17M\)

Finally, we can compute the equilibrium constant:

\(Keq=\frac{0.17M}{(0.45M-0.17M)(0.57M-2*0.17M)^2}\\\\Keq=11.5\)

Best regards.

26.8L is the volume, in liters, of 1.20 mol of C\(_3\)H\(_8\) gas at STP. A measurement of three-dimensional space is volume.

A measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, like the cubic metre or litre, or different imperial or US-standard units, including the gallon, quart and cubic inch. Volume and length (cubed) have a symbiotic relationship.

The volume of an envelope is typically thought of as its capacity, not as the amount of space it takes up. In other words, the volume is the quantity of fluid (liquid or gas) that the container may hold.

Volume = 1.20×22.4

              =26.8L

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Answer:

Left over mass of hydrogen = 0.06 g

Mass of HCl produced = 12.41 g

Explanation:

Given data:

Mass of H₂ = 0.40 g

Mass of Cl₂ = 12.35 g

Mass of left over reactant = ?

Mass of HCl produced = ?

Solution:

Chemical equation:

H₂ + Cl₂    →     2HCl

Number of moles of H₂:

Number of moles = mass / molar mass

Number of moles = 0.40 g/ 2 g/mol

Number of moles = 0.2 mol

Number of moles of Cl₂:

Number of moles = mass / molar mass

Number of moles = 12.35 g/ 71 g/mol

Number of moles = 0.17 mol

Now we will compare the moles of HCl with H₂ and Cl₂.

                     H₂             :            HCl

                      1               :               2

                   0.2              :           2×0.2 = 0.4

                     Cl₂             :             HCl

                      1               :              2

                    0.17           :            2 × 0.17 = 0.34

Chlorine is limiting reactant.

Mass of HCl produced:

Mass = number of moles × molar mass

Mass = 0.34 mol × 36.5 g/mol

Mass = 12.41 g

Leftover mass of hydrogen:

                          Cl₂               :               H₂

                            1                :                 1

                           0.17            :             0.17

Number of moles of H₂ react with Cl₂  are 0.17.

Moles remain unreacted = 0.2 - 0.17 = 0.03 mol

Mass left over:

Mass = number of moles × molar mass

Mass = 0.03 mol × 2 g/mol

Mass = 0.06 g

The sum of the mass of HCl produced plus the mass of left over reactants is:

Mass of hydrogen = 0.06 g

Mass of HCl  = 12.41 g

Given:

Mass of H₂ = 0.40 g

Mass of Cl₂ = 12.35 g

Mass of left over reactant = ?

Mass of HCl produced = ?

Number of moles of H₂:

Number of moles = mass / molar mass

Number of moles = 0.40 g/ 2 g/mol

Number of moles = 0.2 mol

Number of moles of Cl₂:

Number of moles = mass / molar mass

Number of moles = 12.35 g/ 71 g/mol

Number of moles = 0.17 mol

The moles of HCl with H₂ and Cl₂.                

  H₂             :            HCl              

     1              :               2          

     0.2          :           2×0.2 = 0.4                

    Cl₂             :             HCl            

        1             :              2          

       0.17         :          2 × 0.17 = 0.34

The chlorine is limiting reactant.

Mass of HCl produced:

Mass = number of moles × molar mass

Mass = 0.34 mol × 36.5 g/mol

Mass = 12.41 g

Leftover mass of hydrogen:                

         Cl₂               :               H₂            

              1             :                 1          

               0.17       :             0.17

Number of moles of H₂ react with Cl₂  are 0.17.

Moles remain unreacted = 0.2 - 0.17 = 0.03 mol

Mass left over:

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Answer:

2-methylpentan-3-one

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The molar mass of the given gas is equal to 68.48 g.

The ideal gas law can be described as an equation of the state of a hypothetical perfect gas. This equation can be represented as the product of the volume and pressure of one-mole perfect gas is equal to the product of the universal gas constant and absolute temperature of that gas.

The mathematically, ideal gas equation can be written as follows:

PV = nRT

Where n is the moles of gas, P is the pressure,  V is the volume of the gas,  and R is the gas constant.

Given, the volume of collected gas, V = 165 ml = 0.165 L

The temperature of the gas, T = 27° C = 273 + 27 = 300 K,

The pressure of gas, P = 765 mmHg = 0.99 atm

The value of the gas constant, R = 0.082 atm L /K mol

Substituting the values V, R, P, and T in the equation, we get:

The number of moles of the gas, n = PV/RT

n = 0.99 ×0.165/(0.082 × 300)

n = 0.0066 mol

The molar mass of the gas = 0.452/ 0.0066 =68.48 g/mol

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Answer:456

Explanation:

Answer:

Distillation.

Explanation:

Hello there!

In this case, by considering the attached file, which depicts the process of distillation, whereby miscible liquids are separated out by firstly boiling and consequently condensing the liquid with the lowest boiling point so that the liquid with the highest boiling point remains in the flask. This process is widely used in the oil gas industry as lots of heavy (high boiling points) and light (low boiling points) produces can be obtained via distillation.

Regards!

Answer:

See explanation

Explanation:

The formal charge is obtained from;

Formal Charge = Valence electrons on atom - [number of bonds  - lone pair electrons]

The correct structure of ClF2+ is the structure attached to this answer (image obtained from quora) in which the formal charge on fluorine is zero and the formal charge on chlorine is + 1. This is the correct structure because the chlorine is more electronegative than fluorine as expected.

The Lewis structure is a representation that shows electrons' distribution around each of the atoms composing a molecule. In the attached files you will find the Lewis structure for ClF2+.

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

The Lewis structure is a representation that shows electron pairs in bonds between the atoms that compose the molecule. It also shows the solitary electron pairs that remain for each atom.

Structure

Bonds

Electrons

When drawing the Lewis structure of an ion, the entire structure is between square brackets, and the charge is written as an exponent in the upper right corner, outside the brackets.

So let us analyze the exposed example, ClF2+

1) Cl and F have 6 electron pairs and a single one. 7 electrons in total each.

2) Since there are two F and one Cl, then Cl is the central atom and F are the terminal ones.

3) Valence electrons: 7e⁻ F  +  7e⁻ F  +  7e⁻ Cl  = 21 electrons

   Since the ion has a possitive charge, there are 20 electrons.

4) Electron pairs:

Each F needs to form bonds with Cl. Each bond requires two electrons.

Since there are two bonds, four electrons are required.

The 16 remaining electrons must be placed as 8 solitary pairs. Each atom needs a maximum of 8 electrons.

5) The ion is between brackets, and the charge is written as an exponent in the upper right corner.

You will find the image in the attached files.

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

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Answer:

Explanation: observations

The balanced chemical reaction for the synthesis of carbon with hydrogen is CH₄ = C + 2H₂

Balance chemical equation refers to chemical reactions in which the moles and atoms on both the reactant side and product side are the same.

It is a way of balancing chemical equation in which the atoms of each chemicals on the product and reactant are the same.

The balanced chemical reaction for the synthesis of carbon with hydrogen is CH₄ = C + 2H₂

In this reaction,  one molecule of methane is formed by combining one atom of carbon with two molecules of hydrogen gas.

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The given solution is a saturated solution. A homogeneous mixture composed of two or more substances is called a solution.

In a solution, there are two primary components, which are termed as,

At a given temperature and pressure, every solvent is capable of dissolving a particular amount of solute in it.

If a solution has dissolved less amount of solute than it is capable of dissolving, then the solution is known as an unsaturated solution.

If a solution has dissolved as much as it is capable of dissolving, then the solution is known as a saturated solution.

If a solution has dissolved more amount of solute than it is capable of dissolving, then the solution is known as a supersaturated solution.

In the given problem, when the solute crystals are added to the solution, they sink and remain on the bottom of the beaker.

Hence, the given solution is saturated.

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Answer:

Table salt.

Explanation:

Table salt would shatter when hit with a hammer.

C:time

Explanation:

time

The libretto of doctor atomic includes excerpts from the Hindu Bhagavad gita, even though Oppenheimer was unfamiliar with that text. The statement is false.

The libretto of Doctor Atomic was created by Peter Sellars, drawing on original source material, including personal memoirs, recorded interviews, technical manuals of nuclear physics, declassified government documents, and the poetry of Muriel Rukeyser, an American poet and contemporary of Oppenheimer.

The storyline of Doctor atomic has it that scientists and soldiers were secretly stationed in Los Alamos, New Mexico, for the duration of World War II as they worked to bring a monstrous weapon to life.

Hence, Doctor Atomic focuses on the days and hours leading up to the first test of the bomb on July 16, 1945.

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The compromise for these two elements would be to share valence electrons in order for them to adhere to the octet rule. Nonmetallic elements oxygen and Sulphur fall into this category. Covalent bonds are produced when atoms share electrons.

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A) 0.10 m (NH₄)₂SO₄ has the greatest freezing-point depression

Given

The aqueous solutions

Required

The greatest freezing-point depression

Solution

Colligative freezing point

\(\rm \Delta T_f=K_f\times m\)

for electrolyte :

ΔTf = Kf x m x i

i (van't Hoff factor ) = 1 + (n-1) α

All solutions in the problem have a molal concentration (0.1 m) and the same solvent ⇒ assuming water (The same Kf) so that what affects the value of  ΔTf is the value of i (For methanol which is not an electrolyte, we put it aside )

Assuming the degree of electrolyte ionization α= 1, the magnitude i is determined by the number of ions produced by the electrolyte (n)

(NH₄)₂SO₄ ⇒ 2NH₄⁺ + SO₄²⁻ : 3 ions

MnSO₄ ⇒ Mn²⁺ + SO₄²⁻ : 2 ions

NaF ⇒ Na⁺ + F⁻ : 2 ions

KCl ⇒ K⁺ + Cl⁻ : 2 ions

Answer:

Explanation:

Placing ice on a lab table is an exothermic process, which means that the enthalpy change (∆H) for this reaction is negative.The reason for this is that when ice is placed on a lab table, it comes into contact with a surface that is warmer than its own temperature, and heat flows from the warmer surface (the lab table) to the cooler surface (the ice). This heat transfer causes the ice to melt, which is an exothermic process since heat is released to the surroundings.Since exothermic processes release heat energy, the enthalpy change (∆H) for this reaction is negative. Therefore, placing ice on a lab table has a negative ∆H, indicating that it is an exothermic process.

Answer:

pH = 1.85

Explanation:

The reaction of H₂NNH₂ with HNO₃ is::

H₂NNH₂ + HNO₃ → H₂NNH₃⁺ + NO₃⁻

Moles of H₂NNH₂ and HNO₃ are:

H₂NNH₂: 0.0400L ₓ (0.200mol / L) = 8.00x10⁻³ moles of H₂NNH₂

HNO₃: 0.1000L ₓ (0.100mol / L) = 0.01 moles of HNO₃

As moles of HNO₃ > moles of H₂NNH₂, all H₂NNH₂ will react producing H₂NNH₃⁺, but you will have an excess of HNO₃ (Strong acid).

Moles of HNO₃ in excess are:

0.01 mol - 8.00x10⁻³ moles = 2.00x10⁻³ moles of HNO₃ = moles of H⁺

Total volume is 100.0mL + 40.0mL = 140.0mL = 0.1400L.

Thus, [H⁺] is:

[H⁺] = 2.00x10⁻³ moles / 0.1400L = 0.0143M

As pH = - log [H⁺]

The pH of the resulting solution is 1.85.

The reaction is 1:1 hence;

Number of moles of  H₂NNH₂ = 40/1000 L × 0.200 M = 0.008 moles

Number of moles of  HNO₃ = 100/1000 L × 0.100 M = 0.01 moles of HNO3

Number of moles of excess acid = 0.01 moles - 0.008  = 0.002 moles

Total volume of solution;

40.0 mL + 100.0 mL = 140 mL or 0.14 L

Molarity of excess acid = 0.002 moles/ 0.14 L = 0.014 M

Since;

pH = -log[H^+]

pH = -log[0.014 M]

pH = 1.85

The pH of the resulting solution is 1.85.

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Number of second in human lives in scientific notation is 3.9 × 10⁷ second

Given that;

Average human lives = 74 years

Find:

Number of second in human lives in scientific notation

Computation:

Number of second in human lives in scientific notation = 74 × 365 × 24 × 60

Number of second in human lives in scientific notation = 38,894,400

Number of second in human lives in scientific notation = 3.9 × 10⁷ second

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Taking into account the reaction stoichiometry, 1 mole of H₂ can be produced by reacting 2 moles of HCI.

In first place, the balanced reaction is:

Mg + 2 HCl  → MgCl₂ + H₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

By reaction stoichiometry 2 moles of HCl form 1 mole of H₂.

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Answer:

Adding of Br2 to the reaction mixture favours/increases the concentration of BrNO, causing the reaction progress to shift to the left/reactants (away from the forward reaction/products).

Adding of BrNO to the reaction mixture favours/increases the concentration of Br2 and NO (the products), causing the reaction progress to shift to the right/products (away from the backward reaction/reactants).

Explanation:

2BrNO(g) ⇌ 2NO(g) + Br2(g)

According to the Le Chatellier's principle, when one of the factors involved the equilibrium (concentration, pressure and temperarure) of a chemical reaction changes, the equilibrium position of the reaction shifts to remedy this change.

When the concentration of one of the reactants or products changes, the whole position of equilibrium of the reaction shifts to account for this change.

From the reaction given in the question, 2BrNO is on the reactant side and 2NO & Br2 are on the product side.

If more of Br2 is then added to the reaction, it causes an overload of Br2, a product of the reaction, in the reaction setup and the equilibrium responds by shifting to the left, favouring the backward reaction and leading to the production of more BrNO (reactants).

If more of BrNO is then added to the reaction, it causes an overload of BrNO (a reactant in the reaction) in the reaction setup and the equilibrium responds by shifting to the right, favouring the forward reaction and leading to the production of more Br2 and NO (products).

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Answer:

2d

Explanation:

The lowest d is 3d.

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Answer:

Mass PbCl₂ = 50.24g

Mass AgCl = 14.84g

Explanation:

The addition of Cl⁻ ions from the KCl solution results in the precipitation of AgCl and PbCl₂ as follows:

Ag⁺ + Cl⁻ → AgCl(s)

Pb²⁺ + 2Cl⁻ → PbCl₂(s)

If we define X as mass of PbCl₂, moles of Cl⁻ from PbCl₂ are:

Xg × (1mol PbCl₂/ 278.1g) × (2moles Cl⁻ / 1 mole PbCl₂) = 0.00719X moles of Cl⁻ from PbCl₂

And mass of AgCl will be 65.08g-X. Moles of Cl⁻ from AgCl is:

(65.08g-Xg) × (1mol AgCl/ 143.32g) × (1mole Cl⁻ / 1 mole AgCl) = 0.45409 - 0.00698X moles of Cl⁻ from AgCl

Moles of Cl⁻ that were added in the KCl solution are:

0.242L × (1.92mol KCl / L) × (1mole Cl⁻ / 1 mole KCl) = 0.46464 moles of Cl⁻ added.

Moles Cl⁻(AgCl) + Moles Cl⁻(PbCl₂) = Moles Cl⁻(added)

0.45409 - 0.00698X moles + (0.00719X moles) = 0.46464 moles

0.45409 + 0.00021X = 0.46464

0.00021X = 0.01055

X = 0.01055 / 0.00021

X = 50.24g

As X = Mass PbCl₂

And mass of AgCl = 65.08 - 50.24

The masses of the compounds in the precipitate can be found my knowing

the number of moles of chloride ion contributed by each compound.

Reasons:

The given parameter are;

Volume of KCl solution added = 0.242 L

Concentration of KCl solution = 1.92 M KCl

The ions in the solution to which KCl is added = Ag⁺ and Pb²⁺ ions

Precipitates formed = AgCl and PbCl₂

The mass of the precipitate = 65.08 g

Required:

The mass of PbCl₂ and AgCl in the precipitate

Solution;

Number of moles of chloride ions in a mole of PbCl₂ = 2 moles

Number of moles of chloride ions in a mole of AgCl = 1 mole

Let X represent the mass of PbCl₂ in the precipitate, we have;

The mass of AgCl in the precipitate = 65.08 g - X

\(\mathrm{Number \ of \ moles \ of \ PbCl_2} = \dfrac{X \, g}{278.1 \, g} =\mathbf{ \dfrac{X }{278.1}}\)

Number of moles of chloride ions from PbCl₂ is therefore;

\(\mathrm{Number \ of \ moles \ of \ Cl^- from \ PbCl_2} =\mathbf{ 2 \times \dfrac{X }{278.1} \ moles \ of \ Cl^-}\)

\(\mathrm{Number \ of \ moles \ of \ AgCl \ in \ the \ precipitate} = \dfrac{65.08 -X }{143.32}\)

\(\mathrm{Number \ of \ moles \ of \ Cl^- from \ AgCl} = \mathbf{ \dfrac{65.08 -X }{143.32}} \ moles \ of \ Cl^-\)

The number of moles of chloride ions from one mole of KCl = 1 mole

Number of moles of chloride ions from 0.242 L of 1.92 M KCl is therefore;

0.242 L × 1.92 moles/L = 0.46464 moles

Number of moles of chloride ions from KCl = 0.46464 moles

\(0.46464 \ moles \ from \ KCl = \overbrace{ \dfrac{ 2 \times X }{278.1} + \dfrac{65.08 -X }{143.32}} \ moles \ in \ PbCl_2 \ and \ AgCl\)

Which gives;

\(\displaystyle \frac{192}{896089} \cdot X + \frac{1627}{3583} = \frac{1452}{3125}\)

Therefore;

\(\displaystyle X = \frac{\frac{1452}{3125} - \frac{1627}{3583} }{ \frac{192}{896089} } = \frac{105864850549}{2149800000} \approx \mathbf{ 49.24}\)

The mass of PbCl₂ in the precipitate, X ≈ 49.24 g

The mass of AgCl in the precipitate = 65.08 g - 49.24 g ≈ 15.84 g

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Answer:

Heat transfer by radiation occurs when microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed. An obvious example is the warming of the Earth by the Sun. A less obvious example is thermal radiation from the human body.

Answer:

Sculptures rarer than paintings.

Explanation:

Answer:

C. Sculptures rather than paintings

Explanation:

Answer:

the one above me is correct