What is the heat of combustion of ethane, c2h6, in kilojoules per mole of ethane?.

Answer:

3

Explanation:

The molar mass is obtained by adding up the average atomic masses of these atoms: Molar mass H3PO4 = 3(1.008 g) + 1(30.97 g) + 4(16.00 g) = 97.99 g.

Answer:

if you are asking for the chemical reaction:

Ca(OH)2 + H3PO4-------> Ca3(PO4)2 + H2O

Explanation:

In this reaction, phosphoric acid, H3PO4 , a weak acid, will react with calcium hydroxide, Ca(OH)2 , a strong base, to produce calcium phosphate, Ca3(PO4)2 , an insoluble salt, and water.

An example of an external stimulus is a decrease in oxygen levels in the blood during exercise.

Option C

A stimulus is defined as a thing or sensation that causes a specific reaction in an organ or tissue of a living organism

There are two types of stimuli:

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Answer:

An example of an external stimulus is a decrease in oxygen levels in the blood during exercise.

Option C

What is stimulus?

A stimulus is defined as a thing or sensation that causes a specific reaction in an organ or tissue of a living organism

There are two types of stimuli:

Internal stimulus

External stimulus

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Explanation:

From what we know, we can confirm that the variations in colors are a mechanism intended to protect the plants from predators.

This can be observed throughout nature. Many poisonous organisms have evolved bright colors intended to be noticed. Over time, this has resulted in many predators avoiding prey with bright colors, in order to avoid the possibility of being poisoned.

Therefore, we can confirm that the variations in colors are likely a mechanism intended to protect the plants from predators.

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Answer:Set up a proportion os V1/n1 = V2/n2. V is the volume, n is the amount in MOLES, not grams. Convert the CO_2 to moles, then solve and find that the amount of N_2 should be the same amount of moles. Then use the molar mass of N_2 (28.02 grams/mole) to convert that amount of moles into grams. That's your answer.

Explanation:

In chemistry, a mole is a measuring unit of atoms, molecules, ions etc. The number of moles of calcium oxide in the sample is 0.0499 moles.

A mole is a ratio of mass and the molar mass of the substance. It can measure the small number of molecules, atoms, ions etc. present in the compound.

Given,

Mass of calcium oxide = 2.80 g

Molar mass = 56.08 g/mol

Moles can be calculated as:

[tex]\begin{aligned}\rm moles &= \rm \dfrac{mass}{\rm molar \; mass}\\\\&= \dfrac{2.80}{56.08}\\\\&= 0.0499\;\rm mol\end{aligned}[/tex]

Therefore, option A. 0.0499 mol is the moles of the calcium oxide.

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Answer: 0.0499

I hope this helps

Answer:

Water vapour (more than 60%)

Answer:

the correct answer is Metallic bonding

Explanation:

hope this helps

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107.9 g of Ag is produced from a reaction of 31. 75 gram of Copper.

Mass of any substance will be calculated from its moles as:

n = W/M, where

W = required mass

M= molar mas

Given chemical reaction is:

Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

From the stoichiometry of the reaction, it is clear that:

1 mole of Cu = produce 2 moles of Ag

Given mass of Cu = 31.75g

Molar mass of Cu = 63.5g/mol

Moles of Cu = 31.75g / 63.5g/mol = 0.5 moles

0.5 moles of Cu = produce 2×0.5 = 1 mole of Ag

Molar mass of Ag = 107.9g/mol

Required mass of Ag = 1mol × 107.9g/mol = 107.9 g

Hence, option (2) is correct i.e. 107.9 g of Ag is produced.

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The statement which correctly describes the reactants and products of a chemical reaction is: A. The mass of the reactants must be equal to the mass of the products. The total number of moles of the reactants can be more or less than the total number of moles of the products.

LOCOM is an abbreviation for the law of conservation of mass and it states that mass is neither created nor destroyed in any chemical reaction. Thus, the mass of any substance in a balanced chemical equation would remain the same at the end.

According to the law of conservation of mass (LOCOM), the mass of all the reacting chemical elements of any substance (reactants) must be equal to the mass of the product formed during a chemical reaction.

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Answer:

hi-

Explanation:

interaction with acetylcholine?

Aspartic acid 311

10) What amino acid in the binding site of the cholinergic receptor is involved in an ionic interaction with acetylcholine? Feedback: Aspartic acid 311 is ionised and is present in the binding site as a negatively charged aspartate ion.

there are 8 moles of carbon in the molecule because the ratio of carbon per the whole caffine molecule is 8 carbon atoms: 1 molecule of caffine so in terms of moles that's 8:1 :)

Answer:

Solve a problem with the first 100th on my phone and the phone is a bit annoying and I have to use it to get the battery back.

The series which is in order of increasing boiling point is CH3CH2CH3 CH3COCH3 CH2CH2CH3OH

However, the boiling point of an organic substance is the temperature at which the vapor pressure of the liquid organic substance equals the pressure surrounding the liquid and the liquid changes into a vapor.

Organic compounds are substance containing carbon and hydrogen. Some few organic compounds include:

So therefore, the series which is in order of increasing boiling point is CH3CH2CH3 CH3COCH3 CH2CH2CH3OH

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Answer:

because of the small soot particles

Answer:

is due to small soot particles in the flame which are heated to incandescence or the shortage of combustion air .

Answer:

100=43.2

101.3=x

100x=101.3×43.2

100x=4376.16

x=4376.16/100

x=43.7616

The pH value of the solution is mathematically given as

pH=2.35

Question Parameters:

pH during the titration of 20.00 mL of 0.1000 M dimethylamine,

with 0.1000 M HCl(aq) after 21.23 mL of the acid

Generally, the equation for the  Chemical Reaction  is mathematically given as

(CH3)2NH(aq), +Hcl   ---> <---- (CH3)2NH2Cl(aq)

Therefore

[tex]HCl=\frac{0.186mol}{41.86}[/tex]

HCL=0.00444M

WHere

HClaq--->H+(aq)+Cl-(aq)

Hence

H+=0.00444M

pH= -log{H+}

pH=log(0.00444)

pH=2.35

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Answer:

A

Explanation:

Each lamp has the same resistance of 10 ohms thus the voltage drop will be equal. In a series circuit, the Current, (I) is the same because it does not divide anywhere thus Voltage will vary with resistance.

The two lamps (with a resistance of 10 Ohms each) are connected in a series circuit and are supplied with 100- volts of power. The statements are true if the voltage that each lamp receives is each lamp will receive 50 volts. Therefore, option A is correct.

The term resistance is defined as a measure of the opposition to current flow in an electrical circuit. Resistance is quantified in ohms, symbolized by the Greek letter omega (Ω).

Electric current relates to the flow of electrons. An easier way to state resistance is to consider an example of a person in a crowded market struggling to go from one shop to another.

Every lamp has the same resistance of 10 ohms thus the voltage drop will be the same. In a series circuit, the Current, (I) is the equal because it does not divide anywhere thus Voltage will vary with resistance.

Thus, option A is correct.

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Answer:

if you touch a hot stove, the nerves in your skin shoot a message of pain to your brain. The brain then sends a message back telling the muscles in your hand to pull away.

Explanation:

The mass of water H₂O that would be produced from the reaction is 43.2 g

The number of mole can be obtained as by using the ideal gas equation as illustrated below:

n = PV / RT

n = (1.3 × 20) / (0.0821 × 263)

n = 1.2 mole

Balanced equation

2H₂ + O₂ → 2H₂O

From the balanced equation above,

1 mole of O₂ reacted to produce 2 moles of H₂O.

Therefore,

1.2 mole of O₂ will react to produce = 1.2 × 2 = 2.4 moles of H₂O

Mass = mole × molar mass

Mass of H₂O = 2.4 × 18

Mass of H₂O = 43.2 g

Thus, 43.2 g of water were produced from the reaction.

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Answer:

15.6g ofH2O

Explanation:

The ranking is uranium-235 splitting into 92 equal fragments, three equal fragments, and two equal fragments. It also releases radiation.

Nuclear fission refers to a natural chemical reaction where an atom nucleus splits into two or more fragments.

This process (nuclear fission) is well known to release huge amounts of energy and radiation.

The more will be the number of atomic fragments, the more will the energy and radiation released by the process of nuclear fission.

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Answer:

It Is A

Explanation:

I took the test and that was the answer

Answer:

high tmp and pressure

Explanation:

Taking into account the reaction stoichiometry, 4.57 grams of H₂O are formed when8.63 grams of Al₂O₃ reacts with HNO₃.

In first place, the balanced reaction is:

Al₂O₃ + 6 HNO₃  → 2 Al(NO₃)₃ + 3 H₂O

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:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 102 grams of Al₂O₃ form 54 grams of H₂O, 8.63 grams of Al₂O₃ form how much mass of H₂O?

[tex]mass H_{2} O=\frac{8.63 grams of Al_{2} O_{3} x54 grams of H_{2} O}{102 grams of Al_{2} O_{3}}[/tex]

mass of H₂O= 4.57 grams

Then, 4.57 grams of H₂O are formed when8.63 grams of Al₂O₃ reacts with HNO₃.

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Hydrochloric acid isa acid so color is red .

#2

Here is the balanced equation

[tex]\\ \rm\Rrightarrow Na_2CO_3+2HCl\longrightarrow 2NaCl+H_2CO_3[/tex]

1 mol Na_2CO_3 takes 2mol HCL

1mol is 22.4L

moles of Na_2CO_3:-

Moles of HCl=0.36(2)=0.72mol

Answer:

12x+4x-7y+45b+78a-44b+1a+1z+0d+1.1a+1.1a

Answer:

C & D

Explanation:

The attractive force between particles of a liquid determines the temperature at which the liquid changes state: the stronger the attraction, the larger amount of energy is required to break the bonds to boil; i.e. at a higher temperature. So C. Strong attractions mean the liquid boils at a higher temperature is correct.

By the same reasoning, the stronger attractive force between particles also means that it takes more energy to change state from solid to liquid; i.e. a higher melting point.  So D. Strong attractions mean the liquid melts at a higher temperature is also correct.

Answer:

Sulphur

Explanation:

Sulphur because we been 2 ag for 1 s therefore 0.312 S will need 0.624 of Ag

Ag is not the limiting reactant in this case. The limiting reactant is determined by the reactant that is completely consumed first, and in this case, it is S.

To determine the limiting reactant, we need to compare the moles of each reactant to the stoichiometric ratio of the balanced equation. The balanced equation for the reaction is:

2Ag(s) + S(s) →Ag₂S(s)

According to the balanced equation, the stoichiometric ratio between Ag and S is 2:1. This means that 2 moles of Ag react with 1 mole of S to produce 1 mole of Ag₂S.

Given:

Moles of Ag = 0.7 moles

Moles of S = 0.312 moles

To determine if Ag is the limiting reactant, we need to compare the moles of Ag to the stoichiometric ratio.

Moles of Ag / Stoichiometric coefficient of Ag = 0.7 moles / 2 = 0.35 moles

Comparing this value to the moles of S, we can see that 0.35 moles of Ag is less than 0.312 moles of S. Therefore, Ag is not the limiting reactant in this case. The limiting reactant is determined by the reactant that is completely consumed first, and in this case, it is S.

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-2.30 is the pOH of the NaOH solution.

pOH of any solution is define as the negative logarithm of the concentration of OH⁻ ion present in the solution, and it is represented as:

pOH = -log[OH⁻]

In the question it is given that solution is made from NaOH and NaOH is completely dissociate in the solution. So, the concentration of OH⁻ ion is equal to the concentration of NaOH.

Concentration of NaOH will be calculated in the terms of molarity as:

M = n/V, where

n = moles of NaOH = 0.005 mole

V = volume of NaOH = 1 L

M = 0.005/1 = 0.005 M

So, concentration of OH⁻ ion = 0.005 M

Value of pOH will be calculated as:

pOH = -log(0.005) = -2.30.

Hence, option (4) is correct i.e. -2.30.

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Answer:

The answer is c

Explanation:

2.30

Since oxygen is the limiting factor of the reaction, 7.14 g of hydrogen is required to react with 40 litres of oxygen.

The limiting factor in a reaction is that factor which the reaction depends on in order to proceed.

Once the limiting factor in a reaction is absent, the reaction will stop.

In the reaction between hydrogen and oxygen, twice the volume of hydrogen is required to react with oxygen.

In the given reaction, oxygen is the limiting factor.

Volume of oxygen = 40 litres

Volume of hydrogen required = 40 × 2 = 80 litres

Mass of 22.4 L of hydrogen = 2.0 g

Mass of 80 Litres = 80/22.4 × 2.0 g

Mass of hydrogen = 7.14 g

Therefore, 7.14 g of hydrogen is required to react with 40 litres of oxygen.

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