If a system absorbs 155.0 kJ of heat from its surroundings and the
system does 45.0 kJ of work on its surroundings, what is the change
in the internal energy of the system, in kJ?

Answer:

1 grams Cl2 is equal to 0.014103178856514 mole.

Explanation:

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The molarity of the solution in a large beaker that has 6.75 L of a solution containing 5.25 moles of copper (II) sulfate in water is 0.78M.

The molarity of a solution can be calculated using the following formula:

M = n/V

Molarity = 5.25/6.75

Molarity = 0.78M

Therefore, the molarity of the solution in a large beaker that has 6.75 L of a solution containing 5.25 moles of copper (II) sulfate in water is 0.78M.

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(i) The volume of  1.00 M HCl neutralized by two of these ingestion tablets is 20.6 mL

(ii) The mass of salt formed in the neutralization reaction is 0.98 g

(iii) The number of magnesium ions present in that amount of salt is 6.19 × 10²¹ ions

(i) From the question, we are to calculate the volume of 1.00 M HCl neutralized two of the ingestion tablets

From the given balanced chemical equation

Mg(OH)₂(aq) + 2HCl(aq) ⟶ MgCl₂(aq) + 2H₂O(l)

This means,

1 mole of Mg(OH)₂ is neutralized by 2 moles of HCl to give 1 mole of MgCl₂

Now, we will determine the number of moles of Mg(OH)₂ present in two of the ingestion tablets

From the given information

Mass of Mg(OH)₂ in 1 ingestion tablet = 0.30 g

∴ Mass of Mg(OH)₂ in 2 ingestion tablets = 0.60 g

Using the formula,

[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]

Molar mass of Mg(OH)₂ = 58.33 g/mol

Then,

Number of moles of Mg(OH)₂ in 2 ingestion tablets = [tex]\frac{0.60}{58.33}[/tex]

Number of moles of Mg(OH)₂ in 2 ingestion tablets = 0.0102863 mole

Now,

If 1 mole of Mg(OH)₂ is neutralized by 2 moles of HCl

Then,

0.0102863 mole of Mg(OH)₂ will be neutralized by 0.0205726 moles of HCl

∴ The number of moles of HCl that would neutralize 2 ingestion tablets is 0.0205726 mole

Now, for the volume of 1.00 M HCl neutralized by two ingestion tablets

Using the formula,

[tex]Volume = \frac{Number\ of\ moles}{Concentration}[/tex]

Volume = [tex]\frac{0.0205726}{1.00}[/tex]

Volume = 0.0205726 L

Volume = 20.5726 mL

Volume ≅ 20.6 mL

Hence, the volume of  1.00 M HCl neutralized by two of these ingestion tablets is 20.6 mL

(ii) For the mass of salt (MgCl₂) formed in the neutralization reaction

Since 1 mole of Mg(OH)₂ is neutralized by 2 moles of HCl to give 1 mole of MgCl₂

Then,

0.0102863 mole of Mg(OH)₂ will be neutralized by 0.0205726 moles of HCl  to give 0.0102863  mole of MgCl₂

∴ The number of moles of the salt (MgCl₂) formed is 0.0102863 mole

For the mass of the salt formed,

Using the formula,

Mass = Number of moles × Molar mass

Molar mass of MgCl₂ = 95.211 g/mol

∴ Mass = 0.0102863 × 95.211

Mass = 0.9793689 g

Mass ≅ 0.98 g

Hence, the mass of salt formed in the neutralization reaction is 0.98 g

(iii) For the number of magnesium ions present in that amount of salt,

1 mole of MgCl₂ contains 1 mole of magnesium ions

Then,

0.0102863 mole of MgCl₂ will contain 0.0102863 mole of magnesium ions

From the formula,

Number of ions = Number of moles × Avogadro's constant

Avogadro's constant = 6.022 × 10²³ mol⁻¹

∴ Number of magnesium ions present = 0.0102863 × 6.022 × 10²³

Number of magnesium ions present = 0.061944 × 10²³

Number of magnesium ions present = 6.1944 × 10²¹

Number of magnesium ions present ≅ 6.19 × 10²¹ ions

Hence, the number of magnesium ions present in that amount of salt is 6.19 × 10²¹ ions

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Answer:

2.33 g H20

Explanation:

12.1 grams of water are produced when 5.38g of O₂ is reacted.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

Mass of oxygen = 5.38g

Moles = mass / molar mass

Moles of oxygen = 5.38 / 16

                             = 0.34 moles

From the reaction,                      2H₂ + O₂ = 2 H₂O

1 mole of oxygen gives 2 moles of water.

Thus, 0.34 moles of oxygen will give 2 × 0.34 moles

                                                 = 0.67 moles of water.

Mass of water = moles × molar mass

                    = 0.67 × 18

                    = 12.1 g of water

Therefore, 12.1 grams of water are produced when 5.38g of O₂ is reacted.

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Explanation:

Given

Weight of Water (H2O) = 6.4 gms

To find

Number of moles of water = ?

Solution

we know that molar mass of H2O = 18 g

Now,

[tex]Number \: of \: moles =\frac{Given \: weight \: of \: substance}{molar \: mass \: of \: substance} [/tex]

Number of moles = 6.4/18 = 0.355~ 0.36 moles

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Answer:

Explanation:

h2o   =  18 gmol-1

             1mol =18 g

             18 g  =1mol

             6.4g =1/18*6.4

                      = 0.355

                      =0.36mol

The molar concentration of benzene is 0.05mol/L

Data;

molar mass of benzene = 78g/mol

molar mass of ethanol = 46g/mol

mole fraction of benzene is

[tex]mole fraction = \frac{moles of benzene}{total mole}[/tex]

Let's substitute the values and find the mole fraction of benzene

[tex]_yC_6H_6 = \frac{\frac{0.005}{78} }{(\frac{0.005}{78})+ (\frac{1-0.005}{46}) }\\ _yC_6H_6 = 0.00295[/tex]

The density of benzene given is 789 kg/m^3

Molar concentration of the solution is

[tex]M = \frac{789}{0.046} = 17.15Kmol/m^3[/tex]

The concentration of benzene is the product of mole fraction and the molar concentration of the solution

[tex]M = 0.00295 * 17.152 = 0.05Kmol/m^3= 0.05mol/L[/tex]

The molar concentration of benzene is 0.05mol/L

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Answer:

2 Mg(s) + O2(g)→ 2 MgO(s)

Explanation:

Number of moles of magnesium reacted = mass/ molar mass = 3.28g/24gmol-1 = 0.137 moles

From the balanced reaction equation;

2 moles of Mg yields 2 moles of MgO

0.137 moles of Mg yields 0.137 moles of MgO

For oxygen;

Number of moles of oxygen reacted = mass/ molar mass = 7.5g/32gmol-1 = 0.234 moles of O2

If 2_moles of oxygen yields 2 moles of MgO

0.234 moles of oxygen yields 0.234 moles of MgO

Hence Mg is the limiting reactant

Theoretical yield of MgO = 0.137 moles × 40 gmol-1 = 5.48 g of MgO

% yield of MgO = 83.7%

But

% yield = actual yield/theoretical yield × 100

actual yield = % yield × theoretical yield / 100

actual yield= 83.7 × 5.48/100

Actual yield = 4.59 g

According to the equation;

2 moles of Mg reacts with 2 moles of oxygen

Hence 0.137 moles of Mg will react with 0.137 moles of O2

Amount of excess reactant = 0.234 moles - 0.137 moles = 0.097 moles

Mass of excess reactant = 0.097 moles × 32gmol-1 = 3.1g of O2

Answer:

A red shirt appears red to our eyes because the shirt absorbs the red wavelengths of visible light. The shorter the wavelength of light, the more energy it has.

Explanation:

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The properly balanced chemical equation for this chemical reaction is written as follows:

                   [tex]FeCl_{3}(aq)+3Na0H(aq) \rightleftharpoons Fe(OH)_3(s)+3NaCl(aq)[/tex]

A chemical reaction can be defined as a chemical process that involves the continuous transformation (rearrangement) of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, in order to produce a new chemical compound while new bonds are formed.

The chemical reaction of aqueous ferric hydroxide that is dissolved in aqueous sodium hydroxide produces ferric hydroxide and aqueous sodium chloride. Thus, the properly balanced chemical equation for this chemical reaction is written as follows:

                   [tex]FeCl_{3}(aq)+3Na0H(aq) \rightleftharpoons Fe(OH)_3(s)+3NaCl(aq)[/tex]

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Answer:

3. B

4. B

5. C

6. A

7. D

8. C

Explanation:

3. A material or substance is said to be BRITTLE If it can be broken easily when there is an application of force e.g glass

4. A material that cannot conduct heat and electricity is called an INSULATOR. Among the given options, WOOD is a poor conductor of heat i.e. it cannot withstand hear. Iron, gold and copper are all metals, hence, very good conductors.

5. Matter which constitutes all substances tend to react with one another, however, when the observed trait or characteristic is called a CHEMICAL PROPERTY.

6. Physical property of matter can either be intensive or extensive. INTENSIVE PHYSICAL PROPERTY is that characteristic or trait of matter that does not depend on the amount. Example is temperature, density etc

7. PHYSICAL PROPERTY is the property of matter that can be observed or perceived with our senses easily without changing its chemical composition or nature. Example of physical property is melting.

8. Matter exists in three states; solid, gas and liquid. In the GASEOUS state of matter, particles are relatively far apart or scattered and practically independent of each other. This allows gas to be able to diffuse.

Answer:

Please show a file so I can answer your question or tell me which experiment.

Explanation:

Definition:The control group (sometimes called a comparison group) is used in an experiment as a way to ensure that your experiment actually works. It's a way to make sure that the treatment you are giving is causing the experimental results, and not something outside the experiment.

Explanation:

Atomic number = 12

Block = s-block

Period = 3rd

Group = 2nd

Answer:

Air is considered as a mixture because it is composed of various separate components. The air has no characteristic properties of its own. ur welcome :)

Explanation:

Answer:

The molar mass of N

2

is 28 g/mol.

56 grams of N

2

=

28g/mol

56g

=2moles

At STP, 1 mole of any gas occupies a volume of 22.4 L.

2 moles of N

2

at STP will occupy a volume of 2×22.4=44.8L

The part that is missing from the product side = 6 oxygen atoms.

Photosynthesis is the process by which green plants traps in energy from the sun, through their chlorophyll, which they use in the manufacture of sugar with oxygen as a by-product.

The balanced equation of photosynthesis;

6CO2 + 6H2O + (energy) → C6H12O6 + 6O2

From the equation given,

6CO2 + 6H20 - CH1206+?

The missing part of the product = 6O2 (-6 oxygen atoms)

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Answer: Heat energy is another name for thermal energy.

Explanation:

As thermal energy comes from moving particles, it is a form of kinetic energy. Thermal energy comes from a substance whose molecules and atoms are vibrating faster due to a rise in temperature.

Answer:

When a substance heats up, the rise in temperature makes these particles move faster and bump into each other. Thermal energy is the energy that comes from the heated up substance. The hotter the substance, the more its particles move, and the higher its thermal energy.

Answer:

Hydrogen peroxide can function as an oxidizing agent as well as reducing agent. 

H2O2 act as oxidizing agent in acidic medium.

Explanation:

Example : 2FeSO4 +H2SO4 +H2O2 —>

(ferrous sulphate)

Fe2(SO4)3 +2H2O

(ferric sulphate)

This problem is providing the mass of gummy bears which are assumed to contain 13 g of sucrose, which undergoes combustion and produces -214.3kJ of heat according to the following:

In chemistry, when a fuel undergoes combustion, a reaction with oxygen, it produces carbon dioxide and water in a complete combustion. In such a way, with the given reaction, we can write the heat of reaction as -11,286 kJ per mole of reaction:

[tex]\Delta H=-11,286\frac{kJ}{mol\ rxn}[/tex]

Which means that if we need the total heat released by 13 g of sucrose, one must apply the following dimensional analysis including this fuel's molar mass (342.3 g/mol):

[tex]Q=-11,286\frac{kJ}{mol\ rxn}*\frac{1mol\ rxn}{2molC_1_2H_2_2O_1_1}*13gC_1_2H_2_2O_1_1 *\frac{1molC_1_2H_2_2O_1_1}{342.3gC_1_2H_2_2O_1_1} \\\\Q=-214.3kJ[/tex]

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Answer:

O3 => CLO + O2

Explanation:

ozone gas yields one Chlorine Monoxide gas, and two Oxygen gas. i forgot how to explain it well, but I know how to do it and will help in the future if needed :)

Answer:

a) equivalence point

b) direct titration

c) primary standard

d) titrand

e) Back titration

f) back titration

g) standard solution

h) standard solution

I) indirect titration

j) end point

Explanation:

A volumetric analysis is one in which a solution of unknown concentration is determined from its volume. This is commonly referred to as titration.

In titration, a standard solution is reacted with another solution of unknown concentration. The point at which the concentration of the standard solution is equal to that of the analyte is known as the equivalence point (usually indicated by a colour change). An indicator may be added to the analyte solution to help identify when the reaction is complete.

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One mole of or 392 g of chromium sulphate gives 3 moles of sulphate ions. Thus 30 g of chromium gives 0.15 moles of sulphate ions or 9.39 ×10²² ions.

Ions are charged substances formed by electron lose or gain by an atom. If an atom gain an electron it acquire one unit of  negative charge and if it lose an electron it acquires a positive charge.

The ionization of chromium sulphate is written as follows:

[tex]Cr_{2}(SO_{4})_{3} \rightarrow 2Cr^{3+} + 3SO_{4}^{2-}[/tex]

Hence, one moles of chromium sulphate forms 3 moles of sulphate ions. One mole of chromium sulphate is 392.18 g/mol. Thus number of moles 20.4 g of the compounds is 20.4 / 392.18 = 0.052 moles.

The number of moles of sulphate ions produced by 0.052 moles of chromium sulphate is calculated as follows:

0.052 × 3 = 0.15 moles.

One mole of sulphate ion contains 6.022 × 10 ²³ions. Thus number of ions in 0.15 moles is 0.15 ×6.022 × 10 ²³ =  9.39 ×10²² ions.

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Answer:

Hear is the transfer of thermal energy between system.

Work is the transfer of mechanical energy between two systems.

Answer:

17.1 mol

Explanation:

(8.68g/mL * 125 mL) = 1085 g

1085 g/ (63.55 g/mol) = 17.1 mol

Answer:

c

Explanation:

resources are distributed unevenly and often must be moved for human use

Answer:c

Explanation: correct on edg 2020

Answer:

Explanation:

It is odd to describe the presence of a given substance and its dissolved species as a competition but the state is called an equilibrium in solubility.

Answer:

Solubility

Explanation:

Mark that

The amount of given substance and dissolved species is constant at equilibrium .

As per le ch atler's principle

If you change the concentration it would affect the Equilibrium n

Answer:

This question requires use of Avogrado’s constant that states there are 6.02 x10^23 constituent particles contained in the amount of a substance given by one mole. Constituent particles are usually molecules, ions or atoms. Therefore there are 18.06x10^23 total atoms, 12.04x10^23 oxygen atoms, 6.02x10^23 carbon atoms and 6.02x10^23 carbon dioxide molecules.