The average energy consumption for a new Samsung refrigerator is 5.47 × 10 2 kWh/ye ar. What is the average energy consumption of this refrigerator in gigajoules per day? (Given 1 GJ = 277.8 kWh ) show work.

Answer:

a) 1

Explanation:

Unfortunately, we are not given the limiting reagent. The limiting reagent is the reactant which is completely used up first. We can identify it by converting both reactants into the product. The reactant which produces the smallest amount of product is the limiting reagent.

You can convert the moles of CO₂/H₂ to moles CH₃OH using the mole-to-mole ratio. This ratio is made up the balanced equation coefficients of the relevant substances.

1 CO₂ + 3 H₂ -----> 1 CH₃OH + H₂O

2 moles CO₂           1 moles CH₃OH
---------------------  x  ----------------------------  =  2 moles CH₃OH
                                    1 mole CO₂

3 moles H₂           1 moles CH₃OH
-------------------  x  ---------------------------  =  1 mole CH₃OH
                                  3 moles H₂

Because H₂ produces the smallest amount of CH₃OH, it is the limiting reagent. This means that all the H₂ is used up before CO₂ runs out. Therefore, the actual amount of CH₃OH produced is 1 mole.

When 2 mol of carbon dioxide and 3 mol of hydrogen, then one mole of methanol will be produced. Therefore, option (a) is correct.

A limiting reagent is a substance or reactant that is completely consumed in the completion of a chemical reaction and is also known as limiting reactant.

When reactants are not present in stoichiometric quantities, the limiting reactant decides the maximum amount of product that can be formed in a chemical reaction from the reactants.

Given the balanced chemical equation of formation of methanol:

CO₂ + 3 H₂  →  CH₃OH  +  H₂O

From the above reaction, we can say that 1 mole of carbon dioxide reacts with three moles of hydrogen gas to form one mole of methanol.

Then, 2mol of carbon dioxide will react with 6 moles of hydrogen gas.

But we have only 3 mol of hydrogen gas therefore, hydrogen gas acts as a limiting reagent that will be consumed first.

Therefore, three moles of hydrogen gas will produce one mole of methanol maximum.

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The condition that will increase the entropy in a reaction is heating up the reaction (option B).

Entropy in chemistry is the measure or degree of the disorder or randomness present in a chemical system.

In a chemical reaction, reacting substances called reactants collide with one another to form products.

However, the degree at which the reactants collide with one another is referred to as the entropy of the reaction.

Therefore, the condition that will increase the entropy in a reaction is heating up the reaction i.e. increase in temperature.

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Let's see what I can come up with here. So chloroplasts are made up of several separate sections. They have the stroma (the liquid in which everything is contained) and the grana (plural of granum and is a stack of thylakoids). Chlorophyll is found in thylakoids.

The chlorophyll absorbs light (not green light since that is what is reflected to our eyes). Light energy is utilized to split water into hydrogen ions, electrons, and oxygen gas. With these ions and electrons, the electron transport chain, with the assistance of enzymes, produces ATP and NADPH. In all living cells, ATP is the primary source of energy. Because light is required to split water, this step of photosynthesis is known as the "light reaction."

The ATP and NADPH are transported into the stroma, where the "dark reaction" can take place. And, despite the name, it does not occur at night since our energy source does not store well. You've probably heard of the Calvin Cycle. The Calvin Cycle basically uses water, CO2, and the energy from earlier to generate carbohydrates, which are then stored in various ways. Glucose is the most well-known monosaccharide, although there are others, as well as countless polysaccharides such as cellulose and starch.

Thank you,

Eddie

The correct alternative is (b). NaOH will be present in the test tube, after performing electrolysis.

Aqueous electrolysis of salt solutions finds the salt ions in competition with electrolysis of water at the respective electrodes. That is, water can undergo reduction at the cathode as can the cation of the salt; while at the anode water can undergo oxidation as can the anion of the salt. The reactions are as follows:

Cathode:

H₂O(l) + 2e⁻ ⇄ 2OH⁻(aq) + H₂(g)

Anode:  

2H₂O(l) ⇄ O₂(g) + 4H⁺(aq) + 4e⁻

The distinction can be determined by comparing the 'Standard Reduction Potentials' of the half-reactions.

For NaCl(s) => Na⁺(aq) + Cl⁻(aq) :

At the Cathode:

Na⁺ + e⁻ => Na⁰(s); εo = -2.71v

2H₂O(l) + 2e⁻ ⇄ 2OH⁻(aq) + H₂(g); εo = -0.83v (Dominant Rxn at cathode – more positive value)

At the Anode:

Cl⁻(aq) => Cl₂(g) + 2e⁻; εo = 1.36v

2H₂O(l) => O₂(g) + 4H⁺ + 4e⁻; εo = 1.23v (Dominant Rxn at anode – more positive value)

Since the more dominant reaction at the cathode(reduction) produces hydroxide ions, the solution would become alkaline with Na⁺ ions already present.

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The answer is [OH⁻] = 1 x 10⁻⁸.

To find OH⁻, divide the ionic product of water by [H₃O⁺] as :

OH⁻ + H₃O⁺ = H₂O

The equation for the autoionization of water is-

NH3 + H2O → NH4+ + OH− (H2O acts as an acid)

HCl + H2O → H3O+ + Cl− (H2O acts as a base)

Autoionization of water, the autoionization constant Kw, and the relationship between [H⁺] and [OH⁻] in aqueous solutions.

Water can undergo autoionization to form and ions.

The expression for the autoionization constant is

[tex]The expression for the autoionization constant isK_\text{w}=[\text{H}_3\text{O}^+][\text{OH}^-]\quad\quad\text{(Eq. 1)}K w​ =[H 3​ O + ][OH − ][/tex]

In this way the autoionization of water,

NH3 + H2O → NH4+ + OH− (H2O acts as an acid)

HCl + H2O → H3O+ + Cl− (H2O acts as a base) is given.

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The transformations that result in increase in entropy are those that result in increased disorderliness and they are:

The entropy of  a system is a measure of the degree of randomness or disorderliness of a system.

When a system changes from a more ordered state to a more disordered state, there is an increase in the entropy of the system.

Increase in temperature or volume also results in increase in entropy.

For example, when solid melts to form liquid, entropy increases. Also, when liquid changes to gas, entropy of the system increases.

Based on the above transformations:

In conclusion, an increase in disorderliness of a system results in entropy increase.

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Answer:

61 atm

Explanation:

You can calculate osmotic pressure using the following equation:

π = i MRT

In this equation,

-----> π = osmotic pressure (atm)

-----> i = van't Hoff's factor

-----> M = molarity (M)

-----> R = Ideal Gas Constant (0.08206 atm*L/mol*K)

-----> T = temperature (K)

The van't Hoff's factor is the amount of ions the substance dissociates into. Since sugar does not dissociate, this value is 1. After converting Celsius to Kelvin, you can plug the values into the equation and simplify.

i = 1                                 R = 0.08206 atm*L/mol*K

M = 2.5 M                      T = 25 °C + 273.15 = 298.15 K

π = i MRT

π = (1)(2.5 M)(0.08206 atm*L/mol*K)(298.15 K)

π = 61 atm

Answer:

Strong Acid

Explanation:

Hope this helps! :)

Taking into account the definition of dilution, moles of solute (option C) is the only thing about the solution that does NOT change.

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In summary, moles of solute (option C) is the only thing about the solution that does NOT change.

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The equilibrium constant of the reaction is 282. Option D

The term equilibrium constant refers to the number that often depict how much the process is able to turn the reactants in to products. In other words, if the reactants are readily turned into products, then it follows that the equilibrium constant will be large and positive.

Concentration of bromine = 0.600 mol /1.000-L = 0.600 M

Concentration of iodine = 1.600 mol/1.000-L =  1.600M

In this case, we must set up the ICE table as shown;

              Br2(g) + I2(g) ↔ 2IBr(g)

I          0.6            1.6           0

C      -x                -x             +2x

E    0.6 - x         1.6 - x       1.190

If 2x = 1.190

x = 1.190/2

x = 0.595

The concentrations at equilibrium are;

[Br2] = 0.6 -  0.595 = 0.005

[I2] =   1.6 - 0.595 = 1.005

Hence;

Kc = [IBr]^2/[Br2] [I2]

Kc = ( 1.190)^2/(0.005) (1.005)

Kc = 282

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Answer:

emiprical formula is 55

Explanation:

(-^〇^-)

Answer:

2.7

Explanation:

The equation of the reaction is

3 BaCl2 + Al2(SO4)3 = 3 BaSO4 + 2 AlCl3

So, frok the coefficients of the equation, the answer is 2.7

2.67 moles of  aluminum chloride can be produce if we have 4.0 moles of aqueous barium chloride, and we mix this with aluminum sulfate solution.

The balanced chemical reaction is :

3BaCl₂ + Al₂(SO₄)₃ ---> 3BaSO₄ + 2AlCl₃

When aqueous barium chloride is mixed with aluminum sulfate solution, a double displacement reaction occurs. The barium ions from barium chloride react with the sulfate ions from aluminum sulfate to form insoluble barium sulfate  precipitate. At the same time, the aluminum ions  from aluminum sulfate react with the chloride ions  from barium chloride to form aluminum chloride.

Given :

Number of Moles of BaCl₂ = 4.0 moles

From the balanced chemical reaction,moles of AlCl₃:

= (4.0 moles BaCl₂) (2 moles AlCl₃/3 moles BaCl₂)

= 2.67 moles AlCl₃

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Taking into account the definition of pH and pOH, the hydroxide ion concentration will be 6.61×10⁻⁵ M.

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

The following relationship can be established between pH and pOH:

pOH + pH= 14

In this case you know that the hydrogen ion concentration is 1.5×10⁻¹⁰ M, this is, [H⁺]= 1.5×10⁻¹⁰ M.

Replacing in the definition of pH:

pH= - log (1.5×10⁻¹⁰ M)

Solving:

pH=  9.82

Replacing in the relationship established between pH and pOH, the pOH can be calculated as:

pOH + 9.82= 14

Solving:

pOH= 14 - 9.82

pOH= 4.18

Replacing in the definition of pOH, the concentration of hydroxide ion is obtained:

- log [OH⁻]= 4.18

Solving:

[OH⁻]= 10⁻⁴ ¹⁸

[OH⁻]= 6.61×10⁻⁵ M

In summary, the hydroxide ion concentration will be 6.61×10⁻⁵ M.

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Sn^2+ + Br2 ---> Sn^4+ + 2Br^- is referred to as a non-spontaneous redox reaction.

This type of reaction doesn't favor the formation of the product and must be endothermic.

In the reaction above under the given conditions, ΔG is positive and it is intended to form Sn(s) and Br(l) through the reduction of tin cation to make bromine liquid and tin solid. This therefore points to the direction of the reaction being non-spontaneous one.

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Answer:

1187   ( four   S.D. )

Explanation:

(433.621 - 333.9) × 11.900         333.9 has only 4 S.D.      answer should only have 4 S.D

= 1186.6799 = ~  1187     with 4 Significant Digits

Answer: Iron

Explanation: IRON : Iron is an element with symbol Fe and atomic number 26 2) it is the fourth most common element in earth's crust 3) It is a heavy silvery grey metal belongs to the first transition series. 4) High ductility and malleability 5) It is a good conductor.

The identity of the substance is Iron.

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(a) The edge length of the unit cell is 286 pm.

(b) The  the density of aluminum metal is 1.27 x 10⁻²³ g/cm³.

The edge length of the aluminum atom is calculated as follows;

a = 2r

where;

a = 2 x 143 pm = 286 pm

V = a³

V = (286 x 10⁻¹²)³

V = 2.34 x 10⁻²⁹ m³

ρ = ZM/VN

where;

ρ = (4 x 4.479 x 10⁻²³) / ( 2.34 x 10⁻²⁹ x 6.023 x 10²³)

ρ = 1.27 x 10⁻¹⁷ g/m³

ρ = 1.27 x 10⁻¹⁷ g/m³  x (1 m³ / 10⁶ cm³)

ρ = 1.27 x 10⁻²³ g/cm³

Thus, the edge length of the unit cell is 286 pm and the  the density of aluminum metal is 1.27 x 10⁻²³ g/cm³.

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Stoichiometry is used in formulating airbags that shows relationship between product and reactants.

The quick chemical decomposition of solid sodium azide (NaN3) that allows the air bag to inflate fast at any time when the car hit anything. The decomposition reaction is initiated in a car by a small ignition that occurs due to collision sensing mechanism. The nitrogen gas produced during the reaction inflates the air bag which protect the person in the car.

So we can conclude that Stoichiometry is used in formulating airbags that shows relationship between product and reactants.

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Stoichiometry is important in formulating airbags, producing contrails, or formulating rocket engines so as to ensure the required amount of products are formed.

Stoichiometry is the molar relationship between the reactants and products of a reaction.

It is the ratio in which moles of reactants of a reaction combine to form moles of products.

Stoichiometry is important in determining the amount of reactants required to produce a given amount of products.

For example, stoichiometry is important in formulating airbags, producing contrails, or formulating rocket engines in order to ensure the mass of reactants used is enough to produce the required products.

In conclusion, stoichiometry of  a reaction provides the knowledge about the amount of reactants required to form products.

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Based on the role of ubiquitin in protein deconstruction as stated in the passage, the correct options are as follows:

Phrases refers to a group of words which contains a verb but which on their own do not make complete sense.

In the description of the role of Ubiquitin, it is described as a small polypeptide chain containing 76 amino acids. The main tole of ubiquitin is to tag proteins for deconstruction in the proteasomes.

Therefore, the phrase describes the purpose of ubiquitin is to tag waste proteins for recycling in the proteasomes; option A.

Based on the passage, the statement that describes the overall consequence of proteins containing mutations is: Wastes will build up in vital organs, and the organism will experience disease; option D

Individuals with spinocerebellar ataxia experience loss of muscle control, even though the ataxin-1 protein builds up only in the brain and spinal cord because the neurons affected by the ataxin-1 protein buildup are in a region of the brain that manages muscle control; option D.

In conclusion, mutations in ubiquitin-tagged proteins will result in accumulation in the body since they cannot be deconstructed in the proteasomes.

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Answer:

C.) [tex]K_a = \frac{[H^+][H_2PO_4^-]}{[H_3PO_4]}[/tex]

Explanation:

The general structure for a Ka expression is:

[tex]K_a = \frac{[H^+][A^-]}{[HA]}[/tex]

In this expression,

-----> Ka = equilibrium constant

-----> [A⁻] = base

-----> [HA] = acid

The products are in the numerator and the reactants are in the denominator. In this case, H₃PO₄ serves as an acid and H₂PO₄⁻ serves as a base.

As such, the equilibrium expression is:

[tex]K_a = \frac{[H^+][H_2PO_4^-]}{[H_3PO_4]}[/tex]

According to chemical equilibrium, the Ka for the given chemical equation is Ka=[H⁺][H₂PO₄⁻]/[H₃PO₄].

Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in amount of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to produce back the reactants.

At equilibrium, the two opposing reactions which take place take place at equal rates and there is no net change in amount of the substances which are involved in the chemical reaction.At equilibrium, the reaction is considered to be complete . Conditions which are required for equilibrium are given by quantitative formulation.

Factors which affect chemical equilibrium are change in concentration , change in pressure and temperature and presence of catalyst.

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Taking into account the definition of molarity, the final sugar solution has a concentration of 5.028 M.

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

molarity= number of moles÷ volume

Molarity is expressed in units [tex]\frac{moles}{L}[/tex].

In this case, you mix 20.0 mL (0.02 L) of a 3.00 M sugar solution with 30.0 mL (0.03 L) of a 6.38 M sugar solution. To know the concentration of the sugar solution, you need to find the total moles of sugar solution from the mixtures as follow:

Now, the total volume of the solution is calculated adding the volume of the two solutions:

total volume= 20 mL + 30 mL= 50 mL= 0.05 L

Replacing the values inf the definition of molarity:

molarity= 0.2514 moles÷ 0.05 L

Solving:

molarity= 5.028 M

Finally, the final sugar solution has a concentration of 5.028 M.

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Answer:

hope this helps

Explanation:

˙˚ʚ(´◡`)ɞ˚˙

Answer:

The correct answer is a hypothesis.

[tex] \quad \quad\quad\huge \tt{ANSWER}[/tex]

Hydrocarbons are organic compounds which made up of only carbon and hydrogen.

[tex] \pink{ \star}[/tex]Carbon - ( C )

[tex] \pink{ \star}[/tex]Hydrogen - ( H )

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

[tex] \red{✿}[/tex] Type of Hydrocarbon :

[tex] \purple{\mathfrak{llXecretll}}[/tex]

Answer:

Explanation:

When wind passes through. the dust, the dust then also moves throughout the air, when you move and breath in a room, you create slight wind (like a fan moving to creating wind) and this slight wind moves the dust particles.

Answer:

A.) 1.845

Explanation:

You can find the pOH using the following equation:

pOH = -log[OH⁻]

Since NaOH dissociates into 1 Na⁺ and 1 OH⁻, the concentration of both ions is 0.0143 M.

pOH = -log[OH⁻]

pOH = -log[0.0143]

pOH = 1.845

Answer:

The rate of dissolving is influenced by several factors, including stirring, temperature of solvent, and size of solute particles.

The correct IUPAC name of the following structure CH2=CH2-CH-CH3 is But - 1 - ene

Hence the structure CH2=CH-CH2-CH3 is named on the basis of the above rule as but - 1 - ene.

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Answer:

Silver

Explanation:

What mass of copper was discharge at the cathode in a cell