How many moles of oxygen gas molecules would you need to make 12.5 moles of water

The  enthalpy of the reaction, [tex]S_{(s)} + O_{2}_{(g)} \rightarrow SO_{2}_{(g)}[/tex], ΔH is -197 kJ.

The enthalpy change of a reaction, ΔH, is the heat absorbed or given off when reactants form products for a given reaction.

The enthalpy change, ΔH, of the reaction given below:

[tex]S_{(s)} + O_{2}_{(g)} \rightarrow SO_{2}_{(g)}[/tex]

The enthalpy change is calculated from the intermediate reactions:

[tex]S_{(s)} + \frac{3}{2}\:O_{2}_{(g)} \rightarrow SO_{3}_{(g)} \:\Delta H_{1} = -395.2 \:kJ\\SO_{3}_{(g)}\rightarrow SO_{2}{(g)} + \frac{1}{2}O_{2}_{(g)} \:\Delta H_{2} = 198.2\:kJ[/tex]

ΔH = ΔH₁ + ΔH₂

ΔH = -395.2 + 198.2 kJ

ΔH = -197 kJ

Therefore, the enthalpy of the reaction, [tex]S_{(s)} + O_{2}_{(g)} \rightarrow SO_{2}_{(g)}[/tex], ΔH = -197 kJ.

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Answer:

ha djd sidi dj sjejeisns

The process of digestion begins in the mouth with the intake of food. The teeth play an important role in masticating (chewing) or physically breaking food into smaller particles. The enzymes present in saliva also begin to chemically break down food.

Explanation:

Answer:

4.041 moles C₂H₆

Explanation:

To convert from grams to moles, you first need to determine the molar mass of C₂H₆. The molar mass is the combination of the atomic masses times the quantity of each element present in the molecule. The atomic masses usually be found on the periodic table. They represent how much the element weighs per one mole.

Carbon (C) Atomic Mass: 12.01 g/mol

Hydrogen (H) Atomic Mass: 1.008 g/mol

Molar Mass (C₂H₆): 2(12.01 g/mol) + 6(1.008 g/mol)

Molar Mass (C₂H₆): 30.068 g/mol

Now that you have the molar mass, you can multiply this ratio to the given value. Keep in mind that in order to go from grams to moles, the numerical value should be place in the denominator of the molar mass ratio. This allows for the cancellation of the unit 'grams'. The final answer should have 4 significant figures because the given value also has 4 sig figs.

121.5 grams C₂H₆              1 mole
--------------------------  x  ------------------------  =  4.041 moles C₂H₆
                                     30.068 grams

Answer:

B and D

Explanation:

6 abundant elements-

1. oxygen

2. carbon

3. hydrogen

4. nitrogen

5. sulfur

6. phosphorus

Answer:

Phosphorus and Oxygen

Explanation:

Carbon is the most abundant element in our universe then comes oxygen then comes hydrogen.

Sulfur and nitrogen are also counted among most abundant elements

Option B and D are correct

The reaction which represents an acid-base reaction is: HNO3(aq) + NH3(aq) → NH4*(aq) + NO3(aq).

An acid-base reaction is a reaction in which a substance donate protons to another substance which then accepts the proton.

An acid-base reaction usually involves the formation of a salt.

From the given reactions, the acid-base reaction is given below:

In the given reaction, HNO3 donates a proton and NH3 accepts the proton.

Therefore, the reaction which represents an acid-base reaction is: HNO3(aq) + NH3(aq) → NH4*(aq) + NO3(aq).

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Answer:

4 cups?

Explanation:

Based on the dilution formula, 0.1 mL of the stock solution of the enzyme is required to prepare a 50-fold diluted enzyme in 0.01 M HCl.

The 50-fold dilution of the stock enzyme solution can be done by using the dilution formula to determine the given volume of the stock solution required.

The dilution formula is given below:

where:

From the given data for the enzyme dilution;

C1 = 1

C2 = 1/50 = 0.02

V1 = x

V2 = 5 ml

Making V1 subject of formula in the dilution formula:

V1 = C2V2/C1

V1 =  0.02 * 5/1 = 0.1 mL

Therefore, 0.1 mL of the stock solution of the enzyme is required to prepare a 50-fold diluted enzyme in 0.01 M HCl.

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Answer:

Magnets

Explanation:

magnets donot require tension force

Answer:  4

Explanation:

There is a double covalent bond between the carbon atoms of the hydrocarbon, so the ending must be 'ene'.

The concentration of the NaOH solution required for the reaction given the data is 0.44 M

H₂SO₄ + 2NaOH —> Na₂SO₄ + 2H₂O

From the balanced equation above,

CaVa / CbVb = nA / nB

(0.1 × 22) / (Cb × 10) = 1 / 2

2.2 / (Cb × 10) = 1 / 2

Cross multiply

Cb × 10 = 2.2 × 2

Cb × 10 = 4.4

Divide both side by 10

Cb = 4.4 / 10

Cb = 0.44 M

Thus, the concentration of the NaOH solution is 0.44 M

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Answer:

Explanation:

Comment

A: is in group 1. The properties are quite similar

B: the choices for answer B are in column or group 2. They too will have similar properties.

C: the choices there are in group 18. They do have similar properties.

The answer is D.

Note: group means the same thing as column. They are vertical.

Answer:

0.82 M

Explanation:

You have been given moles and volume (in mL). To find the molarity of the solution, you need to (1) convert mL to L and then (2) plug moles and volume into the molarity formula.

985 mL / 1,000 = 0.985 L

Molarity (M) = moles / volume (L)

Molarity = 0.81 moles / 0.985 L

Molarity = 0.82 M

Explanation:

Metallic conductors contain free electron for conduction of electricity and is a good conductor of heat and electricity

electrolytic conductors contain ions for conduction

A chemist most likely study which type of fuel contributes the most to smog.

A chemist is a scientist who majors in or studies chemistry.

A chemist studies the composition of matter, the changes that matter undergo as well as the properties and uses of matter.

Matter can undergo physical or chemical changes.

The consumption of fuels and how they affect the environment will be of interest to a chemist.

Therefore, a chemist most likely study which type of fuel contributes the most to smog.

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Taking into account the reaction stoichiometry,  102 grams of Al₂O₃ are formed when 48 grams of O₂ react.

In first place, the balanced reaction is:

4 Al + 3 O₂  → 2 Al₂O₃

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 96 grams of O₂ form 204 grams of Al₂O₃, 48 grams of O₂ form how much mass of Al₂O₃?

[tex]mass of Al_{2} O_{3} =\frac{48 grams of O_{2} x204 grams of Al_{2} O_{3}}{96 grams of O_{2}}[/tex]

mass of Al₂O₃= 102 grams

Finally, 102 grams of Al₂O₃ are formed when 48 grams of O₂ react.

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The mass of reactant that would produce 800 Joules of heat is equal to 800 J × (1 kJ/1000 J)/(24.7 kJ/g).

In order to determine the mass of reactant that would produce 800 Joules of heat, we would set up a conversion equation as follows:

Note: 1 kJ is equal to 1000 Joules.

Conversion:

1 gram = 24.7 kJ

X gram = 800 Joules

Therefore, the mass of reactant that would produce 800 Joules of heat is given by:

Mass = Heat × (conversion factor/rate of heat)

Mass = 800 J × (1 kJ/1000 J)/(24.7 kJ/g).

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Complete Question:

A certain chemical reaction releases 24.7 kJ/g of heat for each gram of reactant consumed. How can you calculate what mass of reactant will produce 800 Joules of heat?

Answer:

This is a correct answer. 2HCL + Fe = FeCl2 + H2

The given alkyne is Option A 3-heptyne

The hydrocarbon having at least one C-C triple bond is called an Alkyne.

It has the general formula of   [tex]\rm C_n H_{2n+2}[/tex] .

In the question it is being mentioned that it is an alkyne so there will be a triple bond and not a double bond.

It has been asked in the question that

CH3CH₂C ≡  CCH₂CH₂CH3 is which alkyne from the given option.

The counting of the Carbon chain is done from the left side and the Triple bond is at the 3rd Carbon , so 3-heptyne .

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Answer:

Calcium oxide + strontium hydroxide → Portlandite + strontium oxide.

ie... Cao+ Sr(oH)2 = CA (oH)2+ Sro

Answer: A positively charged ion means that there are more protons than electrons. For example, the calcium ion has 2 more protons than electrons.

Considering the Charles's Law, the temperature in the 1 L tank increases.

Charles' Law consists of the relationship that exists between the volume and the temperature of a certain amount of ideal gas, which is maintained at a constant pressure.

This law determines that for a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature. That is, the volume is directly proportional to the temperature of the gas.

Mathematically, Charles' law is a law that says that when the amount of gas and pressure remain constant, the ratio between volume and temperature will always have the same value:

[tex]\frac{V}{T} =k[/tex]

Analyzing an initial state 1 and a final state 2, the following is true:

[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]

According to Charles' law, the volume is directly proportional to the temperature of the gas. So if the volume increases from 250 mL to 1 L, the temperature will also increase.

This is, the temperature in the 1 L tank increases.

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Answer:

24.5 cm

Explanation:

It would be really complicated to type out, so I've attached an image of how I solved this:

*I separated the paperclip into different sections, figured out the length of those sections, and added them together.

(sorry that my work isn't the neatest)

The reaction quotient of the reaction is 7.00238.

From the question.

BrCl2 is 0.004150

Br is 0.003660

Cl is 0.00067210

Q={BrCl2}/{Br}{CL2}

Q=0.004150^2/(0.0036660)(0.00067210)

Q= 7.00238

Equilibrium of chemical reaction is the process in which the reaction remain constant and it is either moving backward or forward.

Therefore, The reaction quotient of the reaction is 7.00238

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Answer:

B.

Explanation:

The amount of space between the particles in a medium reduces as its density rises, which causes light to bend. 2. This impact is highest for light that is close to the medium's surface and weakest for light that is far away from the medium's surface.

Answer:

1.) There are 6 carbons in the longest possible parent chain (hex-). Since there is a double bond, this is an alkene.  The lowest possible carbon the double bond consists of is the 2nd carbon. There is also a methyl group on the 2nd carbon. All together, this makes the structure: 2-methyl-2-hexene.

2.) There are 9 carbons in the longest possible parent chain (non-). The lowest possible carbons the methyl groups are on are the 3rd and 5th carbons. The lowest possible carbon the ethyl group is located on is the 4th carbon. Remember, branches are listed alphabetically. All together, this makes the structure: 4-ethyl-3,5-dimethylnonane.

3.) There are 7 carbons in the longest possible parent chain (hept-). There is a triple bond, making this an alkyne. The lowest possible carbon the triple bond consists of is the 2nd carbon. The lowest possible carbon the methyl group is on is the 4th carbon. All together, this makes the structure: 4-methyl-2-heptyne.

4.) There are 10 carbons in the longest possible parent chain (dec-). The lowest possible carbon the propyl group is on is the 5th carbon. All together, this structure is: 5-propyldecane.

5.) There are 4 carbons in the longest possible parent chain (but-). The lowest possible carbon the methyl group is on is the 2nd carbon. All together, this makes the structure: 2-methylbutane.

6.) There are 5 carbons in the longest possible parent chain (pent-). There is a double bond, making the molecule an alkene. The lowest possible carbon the double bond consists of is the 2nd carbon. The lowest possible carbon the methyl group is on is the 2nd carbon. All together, this makes the structure: 2-methyl-2-pentene.