Ethanol is increasingly being used as a fuel for cars.
The standard enthalpy change of formation of carbon dioxide is -393 kJmol.
The standard enthalpy change of formation of water is --286 kJmol.
The standard enthalpy change of formation of ethanol is -277 kJmol.
What is the standard enthalpy change of combustion of ethanol?​

Answer:

could be species I think

Within the taxonomy, organisms are organized hierarchically, the biological species is the set or natural population of organisms that are recognized because they are similar in form and function.

It is a set of organisms capable of reproducing and obtaining fertile (non-hybrid) offspring, and that share their basic defining evolutionary traits.

The organisms of the same species share generic characters and other factors that allow them to resemble each other and distinguish themselves from the rest of the species.

Therefore, we can conclude that many species share evolutionary origins or are evolutionarily related from some common ancestor.

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Answer:

a

Explanation:

a

Answer:

Reactants are gathered in chloroplasts.

Explanation:

Photosynthesis is a process unique to autotrophic organisms like plants. It is the process whereby plants use energy from sunlight to make their own food (chemical substance). The photosynthetic process occurs in two stages in the Chloroplast viz: Light dependent stage and light-independent stage.

In the light dependent stage, the plant captures energy from sunlight via its Chlorophyll pigment and uses it to break down water molecules (H2O) in a process called PHOTOLYSIS OF WATER. This process brings about the electrons and protons needed to form NADPH and ATP molecules respectively. This process occurs in the thylakoid membrane of the CHLOROPLAST.

In the light independent stage, also known as Calvin cycle, the plant uses the NADPH and ATP molecules produced in the light stage to reduce Carbondioxide (CO2), which enters through the stomata of the plant, and power the formation of glucose molecule (C6H12O6).

Hence, based on the steps listed by Jeremy for the photosynthetic process, the gathering of reactants (CO2, H2O and light energy) in the Chloroplast of the plant best classifies those steps

Answer:

Every single living thing are comprised of cells. Cells are the fundamental units of structure and capacity in living things. New cells are delivered from existing cells.

Answer:

A chemical change

Explanation:

Answer:

554 torr

Explanation:

i got it right on the test.

Answer:

554

Explanation:

The best definition of a watershed is Option(A) Area that collects precipitation and drains it to the lowest point.

A watershed is the area of land where all of the water that drains off at its lowest point of it goes into the same place- a river, stream or lake. The smallest watersheds are the drainage areas for small streams and lakes. It can also be at the lowest point like a creek or a river.

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Explanation:

Answer:

Mo(CO)5 is the intermediate in this reaction mechanism.

Explanation:

The reaction mechanism describes the sequence of elementary reactions that must occur to go from reactants to products. Reaction intermediates are formed in one step and then consumed in a later step of the reaction mechanism.

In this reaction mechanism, Mo(CO)5 is the product of 1st reaction and then it is used as a reactant in 2nd reaction. So, Mo(CO)5 is the reaction intermediates.

The overall balanced equation would be,

Mo(CO)6 + P(CH3) ↔ CO + Mo(CO)5 +  P(CH3)3

Answer:

In terms of molecularity, Step 1 is

⇒ unimolecular

and Step 2 is

⇒ bimolecular.

Explanation:

EDGE 2023

The statement which is correct about acids or base is if blue litmus paper turns red, the substance has a pH below 7 and is an acid.

Acids are those substances which has a pH value below 7 and bases are those substances which has a pH value greater than 7.

Acids turn blue litmus paper to red color and Bases turn red litmus paper to blue color.

So correct statement is if blue litmus paper turns red, the substance has a pH below 7 and is an acid.

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Explanation:

firstly you find for the molar mass of the iron(ii)hydroxide

and then use this formula

mole=mass/molar mass and then slot in your given values

and then you will get

2.57moles

the answer is 2.57 mole of iron(ii)hydroxide

Answer: 310K

Explanation:

Since,

Pressure P = 1.83 atmospheres

Volume of chlorine gas V = 10.2L

Molar gas constant R = 0.0821 L.atm/mol.k)

Number of moles = 0.734 moles

Temperature T(in Kelvin) = ?

Apply ideal gas equation (pV = nRT)

1.83atm x 10.2L= 0.734 moles x 0.0821 L.atm/mol.k x T

18.67 = (0.06026 x T)

T = (18.67 / 0.06026)

T = 310K

Therefore, the new temperature of the chlorine gas is 310K

The physical property that depends on the ability of electrons to move easily is electrical conductivity, which is characteristic of materials like metals that are good conductors of electricity.

B is correct

The physical property of materials that depends on the ability of electrons to move easily is electrical conductivity. Materials with high electrical conductivity, such as metals, allow electrons to flow through them with ease, facilitating the flow of electric current.

Examples include silver and copper, which are widely used in electrical wiring and components due to their excellent conductivity. In contrast, materials with low electrical conductivity or insulators, like rubber or glass, do not allow electrons to move freely, inhibiting the flow of electric current.

When considering the options provided, solubility in water and melting points are not directly related to the movement of electrons, and brittleness is a mechanical property that describes how easily a material can break or shatter.

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Answer:

30284.88J

Explanation:

Given parameters:

Mass of ethanol  = 257g

Specific heat capacity of ethanol  = 2.4J/g°C

Temperature change  = 49.1°C

Unknown:

Amount of heat  = ?

Solution:

The quantity of heat need to cause a temperature change on a body is given as;

               H  =  m c Δt

where  m is the mass

             c is the specific heat capacity

            Δt  is the change in temperature

All units in proper dimensions. Input the parameters and solve for H;

       H  = 257 x 2.4 x 49.1

        H  = 30284.88J

There are approximately [tex]\(1.045 \times 10^{25}\)[/tex] hydrogen atoms in 35.0 g of hydrogen gas, calculated using its molar mass and Avogadro's number.

To find the number of hydrogen atoms in 35.0 g of hydrogen gas, we need to use the concept of molar mass and Avogadro's number.

1. Calculate the molar mass of hydrogen gas (H2):

  The molar mass of one mole of hydrogen gas (H2) is approximately 2.016 g/mol. This value is obtained by adding the atomic masses of two hydrogen atoms (each hydrogen atom has an atomic mass of approximately 1.008 g/mol).

2. Determine the number of moles of hydrogen gas in 35.0 g:

 [tex]\[ \text{Number of moles} = \frac{\text{Mass}}{\text{Molar mass}} = \frac{35.0 \, \text{g}}{2.016 \, \text{g/mol}} \][/tex]

3. Calculate the number of hydrogen atoms using Avogadro's number:

[tex]\[ \text{Number of atoms} = \text{Number of moles} \times \text{Avogadro's number} \][/tex]

Now, let's perform the calculations:

[tex]\[ \text{Number of moles} = \frac{35.0 \, \text{g}}{2.016 \, \text{g/mol}} \approx 17.36 \, \text{mol} \][/tex]

Using Avogadro's number [tex](\(6.022 \times 10^{23} \, \text{atoms/mol}\))[/tex], we have:

[tex]\[ \text{Number of atoms} = 17.36 \, \text{mol} \times (6.022 \times 10^{23} \, \text{atoms/mol}) \][/tex]

[tex]\[ \text{Number of atoms} \approx 1.045 \times 10^{25} \, \text{atoms} \][/tex]

Therefore, there are approximately [tex]\(1.045 \times 10^{25}\)[/tex] hydrogen atoms in 35.0 g of hydrogen gas.

Answer:

All carbohydrates, including sugar, therefore contain the same three elements: carbon, hydrogen and oxygen. Different arrangements of these elements form single units to make different types of carbohydrates. Glucose, for instance, is a single-unit carb with six carbon atoms, 12 hydrogen atoms and six oxygen atoms.

Explanation:

Final answer:

A molecule of glucose is composed of carbon, hydrogen, and oxygen, with the chemical formula C6H12O6, featuring six carbon atoms, twelve hydrogen atoms, and six oxygen atoms arranged in a specific structure.

Explanation:

The elements that make up a molecule of glucose are carbon (C), hydrogen (H), and oxygen (O). The chemical formula for glucose is C₆H₁₂O₆. This indicates that each glucose molecule consists of six carbon atoms, twelve hydrogen atoms, and six oxygen atoms. These elements are arranged in a specific structure where each carbon atom forms four bonds connecting to other carbon atoms, as well as to hydrogen and oxygen atoms. The six carbon atoms form the backbone of the glucose molecule, with the oxygen and hydrogen atoms attached to this carbon chain.

Answer:

Assume that:

n = number of moles

m = mass of substance

M = molar mass (equivalent to atomic weight in the periodic table)

n

=

m

÷

M

The mass (m) of Fe is found.

Your next step is to find the molar mass (M) of Fe.

The molar mass of Fe is 55.9 g/mol.

To find the number of moles for Fe:

n = 112 grams

÷

55.9 g/mol = 2.003577818 moles of Fe(don't round because this is not your final answer or you'll get inaccurate final answer)

Hope it helps you

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Explanation:

Answer:

percentage of water = 18.76%

Explanation:

A chemist has a sample of hydrated Li2SiF6  and it weighs 0.4813 grams.

The overall weight of the compound is 0.4813 grams.

weight of hydrated sample = 0.4813 grams.

weight of anhydrous compound = 0.391 grams

percentage weight of water = mass of water/mass of the hydrated compound × 100

mass of water = mass of hydrated compound - mass of anhydrous compound

mass of water = 0.4813 - 0.391  = 0.0903 grams.

percentage of water = 0.0903/0.4813 × 100

percentage of water = 9.03/0.4813

percentage of water = 18.761687097

percentage of water = 18.76%

Answer:

18.8%

Explanation:

Step 1:

The following data were obtained from the question.

Mass of hydrated Li2SiF6 = 0.4813 g

Mass of anhydrous Li2SiF6 = 0.391 g

Step 2:

Determination of the mass of the water in the hydrate.

Mass of water = (Mass of hydrated Li2SiF6) - (Mass of anhydrous Li2SiF6)

Mass of water = 0.4813 - 0.391

Mass of water = 0.0903 g

Step 3:

Determination of the percentage of water in the hydrate.

The percentage of water = Mass of water/ mass of hydrate x 100

The percentage of water = 0.0903/0.4813 x 100

The percentage of water = 18.8%

Answer: solid,liquid & gas

Explanation:

Three states of water

Water in the solid state e.g Ice block

Water in the liquid state e.g fluids

Water in the gaseous state e.g vapour

Answer: It's D

Explanation:A and B cant be it and C has nothing to do with it because it doesnt talk about evolution while D does that the older fossils resemble us

The volume of that 12M stock solution of HCL must be diluted to generate 6.0 L of 0.50 M would be:

C). 250 mL

Given that,

Stock solution of HCL = 12 M

Amount of HCL to be produced = 6.0 L of 0.50 M

To find,

The volume of stock solution = (0.5 × 6)/12

= 0.25 l

By converting 0.25 liters into ml,

= 0.25 × 1000

= 250 ml

∵ 250 ml is the amount of HCL required.

Thus, option C is the correct answer.

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Answer:

140.25g of CO2

Explanation:

First, let us write a balanced equation showing how CO2 is produced from CH4. This is illustrated below:

When CH4 undergoes combustion it produces CO2 and H2O according to the balanced equation below:

CH4 + 2O2 —> CO2 + 2H2O

Next, let us calculate the mass of the CH4 that reacted and the mass of CO2 produced from the balanced equation. This is shown below:

Molar Mass of CH4 = 12 + (4x1) = 12 + 4 = 16g/mol

Molar Mass of CO2 = 12 + (2x16) = 12 + 32 = 44g/mol

From the balanced equation above,

16g of CH4 produced 44g of CO2.

Therefore, 51g of CH4 will produce = (51 x 44)/16 = 140.25g of CO2.

From the calculations made above, we can see that 51g of CH4 produced 140.25g of CO2

Answer:

139.91 g CO2 to the nearest hundredth.

Explanation:

CH4 +  2O2 ---->  CO2 +  2H2O

Using the molar masses of the chemicals:

 (12.011 + 4*1.008) g CH4 produces  (12,011 + 32) g CO2

So 51 g of CH4 produces   [51 * (12,011 + 32] /  [ (12.011 + 4*1.008) ]

=  139.91 g CO2.

Explanation:

Yes, a chemical reaction can happen with only one substance.

A typical example of such reaction is the radioactive decay.

Radioactive decay is the loss of elementary particles from an unstable nucleus, ultimately changing the unstable element into another more stable element. .

When radioactive elements are let alone, they decompose to form  stable harmless elements.

An example of radioactive decay is attached in the image below;

Answer:

No

Explanation:

A chemical reaction cannot happen with water alone. This is because, a chemical reaction must involve collision of particles from different reactants in order to give a product. No chemical specie can react with itself without some kind of interaction with another chemical specie which may or may not enter into the rate equation for that reaction.

Only nuclear reactions are spontaneous and involve only one reactant for spontaneous radioactive decay.

Answer:

atoms bond mixes with oxygen

Explanation:

Just search it up on google dum dum

Final answer:

Photosynthesis transforms carbon dioxide and water into glucose and oxygen using sunlight energy. This process adheres to the law of conservation of mass, reflecting the transformation of matter without any loss. The resulting carbohydrates are moved within the plant through the phloem, driven by osmotic forces.

Explanation:

How Matter Moves and Changes Through Photosynthesis

Photosynthesis is the biological process that allows plants to convert light energy into chemical energy. During this process, matter in the form of carbon dioxide and water is transformed into glucose and oxygen. Energy from sunlight energizes electrons which, in turn, facilitate the production of energy-carrying molecules like NADPH and ATP during the 'light cycle'. This energy is then used in the Calvin Cycle, or 'dark cycle', to fix carbon dioxide from the atmosphere into glucose, a process that is vital for the cycling of matter and flow of energy through ecosystems.

The law of conservation of mass dictates that the amount of matter remains constant in this process. So, the uptake of carbon dioxide and water and the release of oxygen and glucose reflect a transformation, not a loss of matter. These biochemical processes of photosynthesis support life on Earth, as they produce the basic nutrients that form the foundation of the food chain and release oxygen that is essential for the respiration of most living organisms.

Carbohydrates like sucrose, synthesized during photosynthesis, are then transported from the sites of production to where they are needed within the plant through the phloem. This movement is driven by osmotic forces that arise due to variations in solute concentrations, thus showing how matter moves within the plant system.

Answer:

2.25M

Explanation:

C1V1 = C2V2

25×C1 = 125 × 0.45

C1 = 125×0.45/25

C1 = 2.25M

Answer: 750ml

Explanation:

Using charle's law

V1/T1=V2/T2

V1= 500ml

T1= -73⁰C

V2= ?

T2=27⁰C

We can see that the temperature is in Celsius

Now,we will convert to Kelvin

Kelvin= 273+ Celsius

So convert the Celsius value to Kelvin

For T1= 273+(-73)

T1= 273-73

T1= 200K

For T2= 273+27

T2= 300K

V1/T1=V2/T2

500/200=V2/300

Cross multiply

200×V2=500×300

200V2= 150000

V2= 150000/200

V2= 750ml

So,

750ml of gas will occupy at 27⁰C

Answer:

750mL

Explanation:

Charles law states that the volume of a fixed mass of gas is inversely proportional to its temperature, at constant pressure

Mathematically,

V1/T1 = V2/T2

Values given are;

V1=initial volume of the gas=500mL

T1=initial temperature of the gas=-73.0°C=(-73.0+273)K=200K

V2=final volume of gas

T2=final temperature of gas=27.0°C=(27.0+273)K=300K

The volume of the gas at 27°C is unknown.

We'll make V2 subject of the formula

V1/T1=V2/T2

V2=(V1×T2)/T1

V2=(500×300)/200

V2=750mL

Therefore, the gas will occupy a volume of 750mL at 27.0°C

(c) Temperature 

Temperature is measured directly in a coffee-cup calorimeter.

See Attached Image. Figure shows Coffee-cup calorimeter. This simple apparatus is used to measure temperature changes of reactions at constant pressure.

(c) Temperature is measured directly in a coffee-cup calorimeter.

It is  essentially a polystyrene (Styrofoam) cup with a lid. The cup is partially filled with a known volume of water and a thermometer is inserted through the lid of the cup so that its bulb is below the water surface.

Out of the given options,

Temperature is measured directly in a coffee-cup calorimeter.

Thus, option C is correct.

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The initial volume of the gas can be determined using the ideal gas law. The simplified formula was rearranged to solve for the initial volume. The calculation showed that the initial volume was 18.19 liters.

The subject of the question can be tackled with the application of the ideal gas law represented by the equation PV=nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant and T is the temperature. However, since the number of moles doesn't change in the problem, we can omit n and R from it and use the simplified version of it, that is P1V1/T1=P2V2/T2. Here P1, V1 and T1 refer to the initial pressure, volume and temperature and P2, V2 and T2 refer to the final pressure, volume and temperature respectively.

To get the initial volume of the gas V1, we rearrange the simplified ideal gas law to V1 = (P2V2T1)/(P1T2). Plugging the given values in the formula we get V1 = (30 atm * 29 L * 115 K) / (60 atm * 225 K) = 18.19 liters.

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The correct answer is that the initial volume of the gas was [tex]14.5 \ liters[/tex].

To solve this problem, we can use the combined gas law, which states that for a given amount of gas, the product of pressure and volume divided by the temperature is constant:

[tex]\[\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\][/tex]

where [tex]\(P_1\), \(V_1\)[/tex], and [tex]\(T_1\)[/tex] are the initial pressure, volume, and temperature, respectively, and [tex]\(P_2\), \(V_2\)[/tex], and [tex]\(T_2\)[/tex] are the final pressure, volume, and temperature, respectively.

Given:

[tex]\(P_1 = 60\) atm[/tex] (initial pressure)

[tex]\(P_2 = 30\)[/tex] [tex]\(T_1 = 115\) K[/tex] (initial temperature)

[tex]\(P_2 = 30\)[/tex] atm (final pressure)

[tex]\(V_2 = 29\) liters[/tex] (final temperature)

[tex]\(V_2 = 29\) liters[/tex] (final volume)

We want to find [tex]\(V_1\)[/tex] (initial volume). Rearranging the combined gas law to solve for [tex]\(V_1\)[/tex], we get:

[tex]\[V_1 = \frac{P_2V_2T_1}{P_1T_2}\][/tex]

Plugging in the given values:

[tex]\[V_1 = \frac{(30\text{ atm})(29\text{ liters})(115\text{ K})}{(60\text{ atm})(225\text{ K})}\][/tex]

[tex]\[V_1 = \frac{30 \times 29 \times 115}{60 \times 225}\][/tex]

[tex]\[V_1 = \frac{99350}{13500}\][/tex]

[tex]\[V_1 = 14.5\text{ liters}\][/tex]

Answer: You're right, it's 8 M

Explanation: The higher the number, the sweater it is.

As the concentration of sugar solute molecules increases, the more sweeter the solution will be. Here, 8 M sugar solution is the sweetest one.

Molarity of a solution is a term use to represent its concentration. It is the ratio of number of moles of solute to the volume of solution in litres. Molarity is a temperature dependant property.

Higher the number of moles of the solute higher is the molarity. When it made more diluted by adding more volume its concentration decreases thereby molarity.

8 M sugar solution contains 8 moles of sugar molecules per one liter of water. Which is higher in concentration than the other given concentrations and thus having more sweet.

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