In the following reaction, how much heat is
generated when 1.83 moles of CH4 are
burned?
CH4 (g) + 2 O₂ (g) → CO₂ (g) + 2 H₂O(g) Hº
= -802 kJ/mol
| KJ

Answer:

What is 18 electron rule?

:- The 18-electron rule is a chemical rule of thumb used primarily for predicting and rationalizing formulas for stable transition metal complexes, especially organometallic compounds.

Explanation:

A few common examples of exceptions to 18 electron rules include: 16-electron complexes: The metal center is usually low-spin and is in d8 configuration. These complexes adopt square planar structure, such as Rh(I), Ni(II), Pd(II), and Pt(II) complexes.

Hope its helpful!

Answer:

What is 18 electron rule?

:- The 18-electron rule is a chemical rule of thumb used primarily for predicting and rationalizing formulas for stable transition metal complexes, especially organometallic compounds.

Explanation:

A few common examples of exceptions to 18 electron rules include: 16-electron complexes: The metal center is usually low-spin and is in d8 configuration. These complexes adopt square planar structure, such as Rh(I), Ni(II), Pd(II), and Pt(II) complexes.

Explanation:

Answer:

b option

Explanation:

H2O has a tetrahedral arrangement of molecules or an angular geometry. This is mainly because the repulsion from the lone pair combination is more than bond-pair repulsion.

The solubility (in M) of O2 in the blood of a scuba diver at a depth of 100 feet is 2.32 × 10^-3 mol.

It should be noted that the partial pressure of oxygen will be:

= Mole fraction × Total pressure

= 0.209 × 3

= 0.627

According to Henry's law, the solubility will be:

= 3.7 × 10^-2 × 0.627

= 2.32 × 10^-3 mol

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Answer:

change of state

Explanation:

Change of state   ....  like ice changing state to water ....or water chaging state to steam  

Answer:

70.9 g/mol

Explanation:

To find the molar mass, you first need to convert molecules to moles via Avogadro's Number.

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

2.123 x 10²¹ molecules X₂                      1 mole
--------------------------------------  x  ------------------------------------  = 0.00353 moles X₂
                                                   6.022 x 10²³ molecules

Now, you can plug the molar value and mass (given) into the molar mass ratio to find your final answer. Your answer should have 3 sig figs to reflect the given value with the lowest amount of sig figs (0.250 g).

Molar Mass (g/mol) = mass (g) / moles

Molar Mass = 0.250 g / 0.00353 moles

Molar Mass = 70.9 g/mol

The possible structure of the compound is structure 2.

The full question is shown in the image attached to this question. Now we know that the central atom is sulfur and there are five regions of electron density around the central atom.

Now, we know that the structure is based on a trigonal bipyramid. Let the structure at the RHS be structure 1 and the structure at the LHS be structure 2.

For structure 1;

For structure 2;

Hence, the possible structure of the compound is structure 2.

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Net potential

Net current=3A

Apply ohm's law

The magnesium atom looses two electrons which are accepted by each of the fluorine atoms. (Option D).

An ionic bond is formed when two ions are formed by the loss or gain electrons. In this case, magnesium has to loose two electrons while fluorine will gain two electrons.

Thus, the correct steps in the formation of an ionic bond between these atoms are A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a +2 ion → Each fluorine atom becomes a -1 ion (Option D).

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The volume of the flexible container that holds a sample of hydrogen gas at 153 kPa is 1.51L (option B).

The volume of a substance can be calculated using the following formula:

P1V1 = P2V2

Where;

153 × 3 = 304 × V2

459 = 304V2

V2 = 459/304

V2 = 1.51L

Therefore, the volume of the flexible container that holds a sample of hydrogen gas at 153 kPa is 1.51L.

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The criteria that will allow Amol separate group 1 substances into two groups are mixtures and pure substances (option B).

Mixtures are substances that are made up of two or more substances that can be easily separated.

Pure substances, on the other hand, are elements and compounds that cannot be separated by chemical means.

In group 1 of the above table, the substances can be classified as follows:

Therefore, the criteria that will allow Amol separate group 1 substances into two groups are mixtures and pure substances.

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Answer:

Explanation:

b is the right answer

Answer:

The balanced equation of H2 + Cl2 —-> HCl is 2H2 + 2Cl2 —-> 2HCl.

Explanation:

In a chemical reaction, the number of atoms of each element must be the same on both sides of the equation. In this case, there are two atoms of hydrogen on the left side and two atoms of chlorine. On the right side, there is one atom of hydrogen and one atom of chlorine. In order to balance the equation, we must add another chlorine atom to the right side so that there are two atoms of chlorine on both sides of the equation. The final balanced equation is 2H2 + 2Cl2 —-> 2HCl.

False. Sarah has not achieved homeostasis.

It is the maintenance of a relatively unchanged internal process in the body of organisms.

Since the resting heart rate for Sarah is 70 bpm, a 100 bpm is a far cry from the normal resting heart rate.

Thus, it cannot be said that Sarah has achieved homeostasis.

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Answer:

2.07

Explanation:

1870=(20.01)(c)(45.2)

1870 = 904.452c

c = 2.07 J/g C (to 3 sf]

Answer:

I have the explanation.

Explanation:

Answer:

B

Explanation:

FUN is not building block of matter.

Answer:

Frequency of the wave = 8.33  × 10¹⁶  Hz

Explanation:

• We can use the wave equation to solve this problem:

v = f λ

where:

v = velocity of wave (3.0 × 10⁸ m/s)

f = frequency of wave (?)

λ = wavelength of wave (3.6 × 10⁻⁹ m)

• Substituting these values into the equation:

3.0 × 10⁸  =  f   ×  3.6 × 10⁻⁹

f = (3.0 × 10⁸) ÷ (3.6 × 10⁻⁹)

f = 8.33  × 10¹⁶  Hz

An ion is an electrically charged atom. Details about ions can be found below.

Ion in chemistry refers to an atom or group of atoms bearing an electrical charge.

An example is the sodium (Na+) and chlorine (Cl-) atoms in a salt solution.

Therefore, it can be said that an ion is an electrically charged atom.

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2.54 × 10⁵ kJ of heat are required to fully melt a 0.834 m³ block of ice, with a density of 917 kg / m³.

Melting is a physical change in which solids turn into liquids.

We have a block of 0.834 m³ of ice with a density of 917 kg/m³.

0.834 m³ × 917 kg/m³ = 765 kg = 7.65 × 10⁵ g

We will use the molar mass of water.

7.65 × 10⁵ g × (1 mol/18,02 g) = 4.24 × 10⁴ mol

According to the thermochemical equation, 6.01 kJ are required to melt 1 mol of water.

4.24 × 10⁴ mol × (6.01 kJ/mol) = 2.54 × 10⁵ kJ

2.54 × 10⁵ kJ of heat are required to fully melt a 0.834 m³ block of ice, with a density of 917 kg / m³.

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The initial speed of the boy's thrown is determined as 16.03 m/s.

The initial speed of the throw is calculated as follows;

h = vt - ¹/₂gt²

4 = 3t - (0.5)(9.8)(3)²

4 = 3t - 44.1

3t = 48.1

t = 48.1/3

t = 16.03 m/s

Thus, the initial speed of the boy's thrown is determined as 16.03 m/s.

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A wavelength's frequency and energy (E) drop as it becomes longer. You may conclude from these equations that the wavelength grows shorter as the frequency rises. The wavelength lengthens as the frequency drops.

Since frequency and wavelength are inversely related to one another, the wavelength of the wave falls as frequency increases.

Mercury and carbon two electrodes can't be used with an inactive or inert material.

The electrode is the element which is used to complete the electric circuit in welding. Some time electrode is connected with the positive terminal and sometimes with a negative terminal, it depends on the requirement of the welding process.

Inert electrode is an electrode that serves only as a source or sink for electrons without playing a chemical role in the electrode reaction. Precious metals, mercury, and carbon are typically used as inert electrodes.

Therefore, neither of the two electrodes can be used with an inactive or inert material.

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The combustion reaction mentioned follow the model of the combustion reactions as illustrated in the information about the hybrid vehicles.

It should be noted that the comparison between the decrease in HC emissions and the blended fuels shows that methanol is more effective than ethanol.

The lowest emissions are obtained with methanol-blended fuel. When more combustion is complete, it will result in lower emissions.

Anyone in my family do not own a hybrid vehicle and I didn't have any other experience with a hybrid vehicle. Hybrid electric vehicles are powered by an internal combustion engine and one or more electric motors, that uses energy stored in batteries.

A hybrid electric vehicle cannot be plugged in to charge the battery but rather, the battery is charged through regenerative braking and by the internal combustion engine.

When the technology improves, and the price comes down, I will be interested in purchasing an alternative fuel vehicle.

The government should play in influencing consumers to purchase hybrid vehicles by offering tax credits and giving incentives.

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0.448 moles of ions will form when a 42.66-gram sample of magnesium chloride is dissolved in water (option A).

According to this question, when magnesium chloride (MgCl2) dissolves in water, it dissociates into magnesium ions and chloride ions as follows:

MgCl2(aq) ⟶ Mg2+(aq) + Cl−(aq)

However, if a 42.66-gram sample of magnesium chloride is dissolved in water, this means that 42.66g/molecular mass of MgCl2 will be the number of moles of the ionic products.

molecular mass of MgCl2 = 95.3g/mol

moles = 42.66g ÷ 95.3g/mol = 0.448mol

Therefore, 0.448 moles of ions will form when a 42.66-gram sample of magnesium chloride is dissolved in water.

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The change in temperature (∆T) if 500 J of heat are added to a 23 g sample of silver is calculated to be 90.58°C.

The change in temperature of a substance can be calculated using the following formula:

Q = mc∆T

Where;

500 = 23 × 0.24 × ∆T

500 = 5.52∆T

∆T = 500/5.52

∆T = 90.58°C

Therefore, the change in temperature (∆T) if 500 J of heat are added to a 23 g sample of silver is calculated to be 90.58°C.

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Samantha wanting her team however she needs to make a decision to feel excited about compounding a new medication is ideal.

This is the process of changing or mixing ingredients in order to suit the needs of an individual.

This technique should be best employed so as to ensure prompt and accurate treatment of her illness.

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Answer:

8.81 atm

Explanation:

P1 V1 /T1 = P2 V2 / T2              T   must be in Kelvin

re-rrange to :

P1 V1 / T1  *  T2/V2  = P2

2.81 * 713 / (664)  *  368 /126  = 8.81 atm

The new pressure of the gas given that its volume and temperature change to 126 L and 368 K respectively is 8.81 atm

The new pressure of the gas can be obtained by using the combined gas equation as illustrated below:

P₁V₁ / T₁ = P₂V₂ / T₂

(2.81 × 713) / 664 = (P₂ × 126) / 368

Cross multiply

664 × 126 × P₂ = 2.81 × 713 × 368

Divide both side by 664 × 126

P₂ = (2.81 × 713 × 368) / (664 × 126)

P₂ = 8.81 atm

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Answer:

when asking this question they are looking for the number of Br2 therefore .5 mol

.5*6.022*1023 molecules which equals 3.011*1023 molecules

Explanation:

Its correct

Molar mass of Br_2=160g/mol

No of moles=0.545

Mass

Answer:

a.) pH = 3.62

b.) pOH = 10.38

c.) [OH⁻] = 4.17 x 10⁻¹¹

Explanation:

The hydronium ion concentration can be represented by the symbol: [H₃O⁺]. The hydroxide ion concentration can be represented by the symbol: [OH⁻].

a.) The pH of a solution represents the hydrogen (hydronium) ion concentration. It can be calculated using the following formula:

pH = -log[H₃O⁺]

Since you have been given the hydronium concentration, you can easily find the pH.

[H₃O⁺] = 2.4 x 10⁻⁴

pH = -log[2.4 x 10⁻⁴]

pH = 3.62

b.) The pOH of a solution represents the hydroxide concentration. It measures the opposite of the pH measurement. Since the pH range goes up to 14, you can find the pOH using the following formula:

pOH + pH = 14

Since you now know the value of the pH, you can plug it into the formula to find the pOH.

pOH + 3.62 = 14

pOH = 10.38

c.) You can find the hydroxide concentration using the following formula:

[OH⁻] = 10^-pOH

Since you now know the value of the pOH, you can plug it into the formula to find the hydroxide concentration.

[OH⁻] = 10⁻¹⁰°³⁸

[OH⁻] = 4.17 x 10⁻¹¹