3. Suppose there are 25 molecules of C4H10O in a sealed container. How many hydrogen
atoms are there total inside the container? *Hint* you do not use Avogadro's number -
think, how many atoms are in one molecule? (2pts)

Answer:

D. Each jar contains the same number of atoms

Explanation:

Each of jar containing 1 mole of the element has consisted of an equal number of atoms.

Each jar has been consisted of 1 mole of gas. The number of atoms in a mole of gas can be calculated with Avogadro's number.

Avogadro number has been the constant, that relates the particles and the sample constituents. The value of the Avogadro number has been \(\rm 6.023\;\times\;10^2^3\) .

1 mole of gas = Avogadro's number molecules

Thus, each of them containing 1 mole of the element has consisted of an equal number of atoms.

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Answer:

ATP

Explanation :

Because the energy is released during the process of glycolysis in cellular respiration and then the molecule is captured by the energy carrying molecule which is the ATP (adenosine triphosphate).

Answer:

radiant energy, solar energy

During nuclear fusion, radiant energy and solar energy from the core of the Sun is released. Hope it helps!

Answer:

Answer: molar mass of NaCl is 58.5 gm/mol. This refers to the fact that 1 mole of NaCl weighs 58.5 gram.

Explanation:

Answer:

A. glass and diamond

Explanation:

The  two half cells are : Fe³⁺   +  e⁻    ---->  Fe²⁺

                                      Cu²⁺  +  2e⁻  ---> Cu

The standard electrode potential E° cell = 0.43 V

The overall reaction is given as :

Fe³⁺   +   Cu  ----->  Cu²⁺   +   Fe²⁺

The  two half cells are : Fe³⁺   +  e⁻    ---->  Fe²⁺     E° = 0.77 V

                                      Cu²⁺  +  2e⁻  ---> Cu             E° = 0.34 V

                                       Cu  ---->    Cu²⁺  +  2e⁻      E° = - 0.34 V

The standard electrode potential E° cell = 0.77 V + (-0.34 V)

                                                                    = 0.43 V

Thus, The  two half cells are : Fe³⁺   +  e⁻    ---->  Fe²⁺

                                      Cu²⁺  +  2e⁻  ---> Cu

The standard electrode potential E° cell = 0.43 V

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Answer:

c

Explanation:

It took 14 years between the first man on the Moon and the first US woman in space.

The use of astronomy and space technology to explore outer space is known as space exploration. While astronomers use telescopes to explore space, physical exploration is carried out by both uncrewed robotic space probes and human spaceflight.

Understanding gravity, the magnetosphere, the atmosphere, fluid dynamics, and the geological evolution of other planets, for example, has come from studying the solar system.

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Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 2.78g  is the mass of HCl.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

Molarity= number of moles of solute/volume of solution in litre

Where,

moles= given weight /by molecular weight

         = w/ 36.46

Substituting values in equation 1

0.612=(w/36.46)/( 125/1000)

w=0.80g

Therefore, 2.78g is the mass of HCl.

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Answer:

B. Coal

Explanation: Coal is mined to produce energy.

Answer: Newtons Second Law states that acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated), the greater the amount of force needed to accelerate the object (bullet in our case). Everyone inherently knows that heavier objects require more force to move the same distance as lighter objects.

Explanation:

Answer:

This question is incomplete but the completed question is below

a) Identify the chemical equation that represents what would occur if naphthalene (C₁₀H₈) is burned in the presence of O₂

b) Identify how many moles of carbon dioxide would be released from the equation in (a) if 25.0 g of naphthalene were burned in the presence of excess oxygen.

c) Explain what would happen if only 1 mole of oxygen gas were available to interact with naphthalene in this reaction.

The answers to the questions are below

Explanation:

a) The chemical reaction here will be a combustion reaction. A combustion reaction involves the burning of a substance (in this case an organic compound) in excess oxygen to produce carbon dioxide and water.

The balanced equation below shows what will happen when naphthalene (C₁₀H₈) is burned in the presence of O₂

C₁₀H₈ + 10O₂  ⇒  10CO₂ + 4H₂O

b) The mass of naphthalene (C₁₀H₈) from the equation above is

when C= 12 and H = 1; C₁₀H₈ = (10 × 12) + (1 × 8) = 128 g

Mass of C₁₀H₈ from the equation in (a) above is 128 g

If 128g of C₁₀H₈ ⇒ 10 moles of CO₂

25g of C₁₀H₈ ⇒ X moles of CO₂

where X is the unknown

X = 25 × 10/128

X = 1.95 moles of CO₂

1.95 moles of CO₂ would be released from the equation in (a) if 25.0 g of naphthalene were burned in the presence of excess oxygen

(c) If just 1 mole of oxygen gas was available for the reaction in (a) above, the reaction would have been an incomplete combustion. An incomplete combustion is the process in which a substance burns in insufficient oxygen to produce carbon monoxide (CO) and water.

The number of atoms which are present exactly in 12 grams of carbon-12 is called Avogadro's number.

Avogadro's number is the number of atoms which are present in 1 mole of any substance and it is equal to 6.022×10²³.

And moles will be calculated as:

Moles of Carbon-12 = 12g / 12g/mol = 1mole

In 1 mole of Carbon-12 = 6.022×10²³ atoms are present.

Hence, the number of atoms in exactly 12 grams of carbon-12 is called Avogadro's number.

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Answer:

The specification of the query in the discussion is characterized below.

Explanation:

At pOH value  of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

In this question we will apply the formula

      pH +pOH = 14 . . . . . . . . . . . . .(1)

where pH = concentration of [\(H^{+}\) ] ion

pOH = concentration of [\(OH^{-}\) ] ion

As per the question

pOH =6.0

Putting the value of pOH in equation (1) we get the value of pH

              pH + 6.0 =14

             pH = 14 -6.0

             pH  = 8.0

 The value of pH if the pOH value is 6.0 is 8.0

To find the concentration of \(H^{+}\) ion we will use the following formula

This is calculated by the formula

                                 [\(H^{+}\)} = \(10^{-pH}\)

where we will write the values of pH

Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)

Therefore at  pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

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The complete question is -

What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?

Answer:

B. 2-butene and

D. 3-hexene can show the phenomenon of geometric isomerism.

Explanation:

The compounds that can exhibit geometrical isomerism has been 2-butene and 3-hexene. Thus, option B and D is correct.

Isomers can be defined as the compounds with same unit formula and different structures.

The difference in structure has been resulted in various types of isomers, have been geometrical , structural, functional.

The geometrical isomers has been defined as the compounds with same chemical formula and difference in the spatial arrangement of the atom across the bonds. The geometrical isomerism results in cis and trans isomers.

The geometrical isomerism has been found in the compounds with the compounds exhibiting carbon-carbon double bond. The double bond has been present at the middle of the compound to exhibit geometrical isomerism.

The compounds that can exhibit geometrical isomerism has been 2-butene and 3-hexene. Thus, option B and D is correct.

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Mass of water vapor produced : 0.90 g

Given

0.10 g of hydrogen reacted with 0.80 g of oxygen

Required

mass of water vapor produced

Solution

Reaction

2H₂ + O ⇒ 2H₂O

If we refer to the law of conservation of mass which states that the mass before and after the reaction is the same, then the mass of water vapor formed as a product is:

mass reactants = mass products

mass of Hydrogen + mass of Oxygen = mass of water vapor

0.1 g + 0.8 g = 0.90 g

Or we can also solve by using stochiometry (using the concept of moles) to find the mass of water vapor

The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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According to the given information we can conclude that the potential energy of the products is lower that the potential energy of the reactants and therefore, heat is released by the system.

It means that the correct answers are a and d.

Explanation:

Lithium sulfide

if my answer helps you than mark me as brainliest.

Answer:

Part 1: C₉H₂₀ (l) + 14O₂ (g) ----> 9CO₂ (g) + 10H₂0 (g)

Part 2: Volume of CO₂ produced = 1223.21 L

Note: the complete second part of the question is given below:

2. Suppose 0.470 kg of nonane are burned in air at a pressure of exactly 1 atm and a temperature of 17.0 °C. Calculate the volume of carbon dioxide gas that is produced. Round your answer to 3 significant digits.

Explanation:

Part 1: Balanced chemical equation

C₉H₂₀ (l) + 14O₂ (g) ----> 9CO₂ (g) + 10H₂0 (g)

Part 2: volume of carbon dioxide produced

From the equation of the reaction;

At s.t.p., I mole of  C₉H₂₀ reacts with 14 moles of O₂ to produce 9 moles of CO₂

molar mass of  C₉H₂₀  = 128g/mol: molar mass of CO₂ = 44 g/mol, molar volume of gas at s.t.p. = 22.4 L

Therefore, 128 g of C₉H₂₀ produces 14 * 22.4 L of CO₂ i.e. 313.6 L of CO₂.

O.470 Kg  of nonane = 470 g of nonane

470 g of C₉H₂₀ will produce 470 * (313.6/128) L of CO₂ = 1151.50 L of CO₂

Volume of CO₂ gas produced at 1 atm and 17 °C;

Using P₁V₁/T₁ = P₂V₂/T₂

V₂ = P₁V₁T₂/P₂T₁

where P₁ = 1 atm, V₁ = 1151.50 L, T₁ = 273 K, P₂ = 1 atm, T₂ = 17 + 273 = 290 K

Substituting the values; V₂ = (1 * 1151.5 * 290)/(1 * 273)

Therefore volume of CO₂ produced, V₂ = 1223.21 L of CO₂

Answer:

36°C is your answer

Explanation:

use the molar mass to find moles:

(10.00g Au)(1 mole Au/197 grams)= 0.05076 moles of gold

dH= n C dT

14.0 J = (.05076 moles) (25.41 J/mol* degree C) (dT)

dT=10.85 celsius rise in temp

if initially at 25 degrees celsius, a 10.85 celsius rise in temp will bring it to 35.85.

so round that answer and you should get 36 degrees as your answer

(hope this helped :) )

Considering the definition of calorimetry, the final temperature of the gold is 35.85 °C.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

In other words, calorimetry is responsible for measuring the amount of heat generated or lost in certain physical or chemical processes.

The amount of heat that a body receives or transmits is determined by the following expression:

Q = c×m×ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Then:

14 J= 25.41 \(\frac{J}{molC}\)× 0.05076 moles× (Tfinal - 25 C)

Solving:

\(\frac{14 J}{ 25.41 \frac{J}{molC}x 0.05076 moles} =Tfinal - 25 C\)

\(Tfinal=\frac{14 J}{ 25.41 \frac{J}{molC}x 0.05076 moles} + 25 C\)

Tfinal= 35.85 °C

Finally, the final temperature of the gold is 35.85 °C.

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Answer:

Chemical is best answer

Explanation:

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Answer:

chemical is the  answer

Explanation:

the bond angle is 90° since it's a tetrahedral shape.

Each oxygen (O) atom has 6 valence electrons, and sulfur (S) also has 6 valence electrons.

The sulfate ion has four oxygen atoms, so we multiply that number by those atoms' valence electrons to get the following result: 24 valence electrons (4 x 6). When we add the sulfur valence electrons (six) to the total number of oxygen valence electrons (24), we get a total of 30 valence electrons.

We count the number of electron domains (bonding pairs and lone pairs) surrounding the primary atom to establish the electron-domain geometry. In this example, the lead atom is sulfur (S). There is no single pair; Instead, there are four bond pairs (two SO double bonds and two SO single bonds). As a result, the shape of the electron domains is tetrahedral.

The positions of the atoms, not their lone pairs, are used to establish molecular size. The molecular geometry of sulfate ion is also tetrahedral. By counting the number of electron domains, it is possible to establish the degree of hybridization of the primary atom (sulfur, S). Sulfur is surrounded by a four electron domain, so the hybridization is \(sp^3\). When it comes to bond angles, the S-O bonds of sulfate ion are separated by about 109.5 degrees.

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Hsvhpsvuwgycwhusvywgogwitcsuovsigsviyscyisvyos

Hi there,

I hope you and your family are staying safe and healthy!

The correct answer is C

Each shell can contain only a fixed number of electrons. The first energy shell around a nucleus can hold up to 2 electrons. Then the second shell can hold up to 8 eletrcons.

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Best,

~Gary

We know at NTP each gas has 22.4L of volume .

\(\boxed{\sf 1mol\:of\:CO_2=22.4L=44g}\)

Hence 1g of CO2 contain

\(\\ \sf\longmapsto \dfrac{22.4}{44}\)

\(\\ \sf\longmapsto 0.5L\)

Now 44.4g of CO_2 has

\(\\ \sf\longmapsto 0.5\times 44.4=22.2L\)

Because every sample of water has the same density (at the same temperature), density is a distinguishing attribute of water. There is a 1 g/cm3 density.

The substance's weight per cubic centimetre of volume is known as its density (volumetric density of mass and specific mass). Although the Latin letter D may also be used, the sign most frequently used for density is .

Density is sometimes roughly described as something's weight per unit volume, like in the oil and gas business in the United States, for example. Because every sample of water has the same density (at the same temperature), density is a distinguishing attribute of water. There is a 1 g/cm3 density.

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