What could be the third quantum number for one of the electrons in the 4penergy sublevel of bromine?A. m = -1B. m = 5C. m = +D. m = 4

The enthalpy change (ΔH) for the reaction CaC(s) + H2O(I) → Ca(OH)(ag) + CH4(g) is -3617.6 kJ.

To calculate ΔH for the reaction CaC(s) + H2O(l) → Ca(OH)2(ag) + CH4(g), we can use Hess's law, which states that the enthalpy change of a reaction is independent of the pathway taken and depends only on the initial and final states.

We can manipulate the given reactions to obtain the desired reaction:

(i) Ca(s) + 2C(graphite) → CaC2(s) ΔH = X (unknown value)

(ii) Ca(s) + 1/2O2(g) → CaO(s) ΔH = -635.5 kJ

(iii) CaO(s) + H2O(l) → Ca(OH)2(ag) ΔH = -653.1 kJ

(iv) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = -1300.0 kJ

(v) C(graphite) + 1/2O2(g) → CO(g) ΔH = -393.5 kJ

Now, let's manipulate these equations to cancel out the common reactants and products and obtain the desired reaction:

(i) Ca(s) + 2C(graphite) → CaC2(s) ΔH = X

(ii) Ca(s) + 1/2O2(g) → CaO(s) ΔH = -635.5 kJ

(iii) CaO(s) + H2O(l) → Ca(OH)2(ag) ΔH = -653.1 kJ

(iv) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = -1300.0 kJ

(v) C(graphite) + 1/2O2(g) → CO(g) ΔH = -393.5 kJ

Now, let's sum up the equations to obtain the desired reaction:(i) Ca(s) + 2C(graphite) → CaC2(s) ΔH = X

(ii) 2Ca(s) + O2(g) → 2CaO(s) ΔH = -1271 kJ

(iii) CaO(s) + H2O(l) → Ca(OH)2(ag) ΔH = -653.1 kJ

(iv) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = -1300.0 kJ

(v) C(graphite) + 1/2O2(g) → CO(g) ΔH = -393.5 kJ

By adding equations (ii), (iii), (iv), and (v), we can cancel out CaO(s), H2O(l), and O2(g):

2Ca(s) + 2C(graphite) + CH4(g) → 2Ca(OH)2(ag) + CO(g) ΔH = X -1271 -653.1 -1300.0 -393.5

2Ca(s) + 2C(graphite) + CH4(g) → 2Ca(OH)2(ag) + CO(g) ΔH = X -3617.6 kJ

For more such questions on enthalpy visit:

https://brainly.com/question/14047927

#SPJ8

Answer:

The atmospheres of Jupiter and Saturn are made almost entirely of hydrogen and helium, although there is some evidence they contain hydrogen compounds. The there is Uranus and Neptune that are made primarily of hydrogen compounds, with smaller traces of hydrogen, helium, metal and rock.

Explanation:

Hope this helps.

Answer:

Explanation:

Here, we want to get the number of moles in the given mass of water

To get this, we have to divide the mass given by the molar mass of water

Mathematically:

The molar mass of water is 18 g/mol

Thus, we have the number of moles as:

The electron geometry  of HCN is linear geometry and molecular geometry of the carbon in HCN  is linear geometry.

The lewis structure is as follows :

H - C ≡ N :

The number of the the valence electrons = 10 electrons

The carbon is the central atom. The HCN is the AX2 type of the molecule. The A is the central atom. X is the central atom. This type of the molecule has the linear electron geometry. There is no lone in the central atom, therefore the molecular geometry of the HCN is linear geometry.

Thus the both electron and the molecular geometry is linear.

To learn more about geometry here

https://brainly.com/question/13837937

#SPJ4

Answer:

If you could miraculously remove two neutrons from an atom's nucleus, the atomic number and electrical charge would stay unaltered. Because neutrons have no electrical charge, adding or removing them from the nucleus has no effect on the nucleus's electrical charge. It does, however, alter the nucleus's mass. Isotopes are formed by adding or subtracting neutrons from the nucleus.

Answer:

A

Explanation:

it has a methyl group, ethyl group and amine group

The correct IUPAC name for the structure shown in the provided image is "ethylamine." The structure consists of a central nitrogen atom bonded to two carbon atoms.

The correct IUPAC name for the structure shown in the provided image is "ethylamine." The structure consists of a central nitrogen atom bonded to two carbon atoms. According to the IUPAC naming rules, the longest carbon chain is selected as the parent chain, which in this case consists of two carbon atoms. The substituent attached to the parent chain is an ethyl group, denoted as "C2H5". The amine functional group, which consists of the nitrogen atom, is named as "amine". Since there is only one amine group attached to the carbon chain, it is referred to as "ethylamine." Therefore, option C) "ethylamine" is the correct IUPAC name for the given structure.
For more question on IUPAC

https://brainly.com/question/28872356

#SPJ11

Answer:

Something or someone you can see invisibility is the opposite of something you cannot see or some thing you cannot see

Explanation:

Answer:

More bro

Explanation:

Pollution is only increasing

Answer: Yes and no, no because people are constantly polluting the earth with plastic which is a big issue.  Yes, because things are being invented to help with plastic pollution, and there is a great number of people who recycle, so however you look at it there's really a 50/50 chance.

Explanation:

To give 33.6 dm³ hydrogen gas at STP, 18.06 x 10²³ atoms of Na must react completely.

A mole is a unit of measurement used to measure the amount of any fundamental entity (atoms, molecules, ions) present in the substance.

As according to the given equation, 2 moles (ie 12.04 x 10²³ atoms) of Na-atoms produces 1 mole (22.4 ltr) of H₂-gas.

Hence, to produce 33.6 ltr (equivalent to 33.6 dm³) of H₂-gas produced by ;

   = 12.04 x 10²³ atoms of Na / 22.4 ltr of H₂-gas x 33.6 ltr

   = 18.06 x 10²³ atoms of Na

Hence, To give 33.6 dm³ hydrogen gas at STP, 18.06 x 10²³ atoms of Na must react completely.

Learn more about Mole concept here ;

https://brainly.com/question/20483253

#SPJ1

Answer: Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

A physical change is are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.

Answer:

Ok giv me a min

Explanation:

Answer:

3

Explanation:

Resonance is a valence bond concept put forward by Linus Pauling to explain the fact that the observed properties of a molecule may be as a result of the fact that its actual structure lie somewhere between a given number of structural extremes called canonical structures or resonance structures.

There are three resonance structures for SO3 that obey the octet rule. All the S-O bonds in SO3 are equivalent in these resonance structures.

Seven equivalent resonance structures for the molecular of SO3 can be drawn without breaking the octet rule.

We can arrive at this answer because:

In an SO3 molecule, electrons are shared between atoms. This sharing can be done with seven resonance structures.

These structures are shown in the figure below.

More information:

https://brainly.com/question/8155254?referrer=searchResults

Answer:

0.0964, I worked out the moles of barium hydroxide and divided this by two and then divided that by the volume of nitric acid

Explanation:

Answer:

0.258 mol/dm3

Explanation:

Ba(OH)2 + 2HNO3 ---------> Ba(NO2)2 +2H2O

1 : 2 : 1 : 2

0.00645 : 0.0129 : 0.00645 : 0.0129

Moles of Nitric Acid

Moles=Concentration X Volume(dm3)

0.600 X 0.0215

=0.0129 mol

Concentration= Moles/ Volume(dm3)

0.00645/0.025

= 0.258 mol/dm3

Answer:

Project shadow #KARMA be there

Explanation:

Answer:

Cl < S < P < Na

Explanation:

We have to understand the trend for effective nuclear charge before answering the question;

The periodic table tendency for effective nuclear charge: Increase across a period (due to increasing nuclear charge with no accompanying increase in shielding effect). Decrease down a group (although nuclear charge increases down a group, shielding effect more than counters its effect).

Based on this, the elements can be arranged in the following order;

In decreasing order;

Cl < S < P < Na

Types of luminous flames:

1. Yellow Luminous Flame

2. Smoky Luminous Flame

3. Orange Luminous Flame

4. Blue Luminous Flame

Luminous flames are characterized by their visible glow, which is caused by the incomplete combustion of fuel. The presence of soot particles in the flame causes the emission of light. There are different types of luminous flames, which can be classified based on their fuel composition and burning conditions. Here are some common types of luminous flames:

1. Yellow Luminous Flame: This is the most common type of luminous flame, often seen in open fires, candles, and gas stoves. It appears yellow due to the presence of soot particles in the flame. Yellow flames indicate incomplete combustion of hydrocarbon fuels, such as methane, propane, or natural gas. The high carbon content in these fuels leads to the formation of soot, which emits visible light.

2. Smoky Luminous Flame: This type of flame is characterized by a significant amount of black smoke and soot production. It is commonly observed in poorly adjusted or malfunctioning burners or engines. The excessive presence of unburned fuel in the flame results in incomplete combustion and the emission of dark smoke particles.

3. Orange Luminous Flame: An orange flame indicates a higher combustion temperature compared to a yellow flame. It is often seen in more efficient burners or when burning fuels with a higher carbon content, such as oil or diesel. The higher temperature helps in burning more of the carbon particles, reducing the amount of soot and making the flame appear less yellow.

4. Blue Luminous Flame: A blue flame is typically associated with complete combustion. It indicates efficient burning of fuel, resulting in minimal soot formation. Blue flames are commonly observed in gas burners or Bunsen burners. The blue color is a result of the combustion of gases, such as methane, in the presence of sufficient oxygen.

It's important to note that the luminosity of a flame can vary depending on factors such as fuel-air mixture, combustion temperature, and the presence of impurities. Achieving complete combustion and minimizing the production of soot is desirable for efficient and cleaner burning processes.

for more questions on luminous

https://brainly.com/question/27163038

#SPJ8

Answer:

Mole fraction(CHCl3)  = 0.681

Mole fraction (CH3COBr) = 0.319

Explanation:

Molar mass(CHCl3) = 12+ 1 + 3*35.5 = 119.5 g/mol

Molar mass(CH3COBr) =  2*12 + 3*1 + 16 + 80 = 123 g/mol

112. g* 1mol/119.5g = 0.9372 mol CHCl3

54. g * 1 mol/123g = 0.4390 mol  CH3COBr

Mole fraction(CHCl3) = 0.9372/(0.9372+0.4390) = 0.681

Mole fraction (CH3COBr) = 0.4390/(0.9372+0.4390) = 0.319

0.681+0.319 =1.000 true

Answer:mole fraction of KCl = 0.18

Explanation:

no of moles of KCl     = Mass/Molar mass

where mass (weight) of KCl = 200.0g

molar mass of KC1= 74.6g/mol

                                                = 200/74.6   = 2.68 moles

no of moles of H2O = Mass/Molar mass

where mass (weight) of water = 215.0g

molar mass of water = 18.0g/mol

                                              = 215/18   = 11.94moles

mole fraction of KCl  = no of moles of KCl/(no of moles KCl + no of moles of H2O(water))

                                                = 2.68/(2.68+ 11.94)

                                                 = 2.68/14.62   = 0.18

Answer: 2.5 feet is already in 2 sig figs, in inches it would be 30. (30 including the deciaml) and in cm it would be 76

Explanation:

The larger ionization energy of atoms in each pair is S, V, Ne, and Ca.

The ionization energy can be defined as the minimum amount of energy that an electron has to absorb to knock out itself from the influence of the nucleus of a gaseous atom or ion.

It provides the reactivity of chemical compounds and evaluates the strength of chemical bonds. The measurement units of ionization energy are electronvolts (eV) or KJ/mol.

Ionization energy measures the difficulty in removing an electron from an atom or ion and the loss of electron occurs in the ground state of the chemical species.

As we move in a period, the electronegativity and effective nuclear charge of the elements increase therefore, ionization energy increases.  Therefore, S has larger ionization energy than Na and V has larger ionization energy than K. Ne is a noble gas so it will have larger ionization energy than F.

The electron can easily be removed from the atom as we move down the group. Therefore, calcium present at the top of the group has a larger ionization energy than Barium (Ba).

Learn more about  ionization energy, here:

brainly.com/question/16243729

#SPJ1

Answer:

1.418688 atm

Explanation:

(a)  Moles of PCl5 = mass / molar mass

                      =1.5 g / 208.22 g/mol

                     = 0.0072 moles

Also given,

T = 600 K

V = 0.500 L

Pressure of PCl5, P = nRT / V

                             = 0.0072 mol×0.0821 L-atm / (mol.K)×600 K / 0.500 L

                             = 0.709344 atm

(b)  PCl5(g) ⇄ PCl3(g) + Cl2(g)

Initial               0.965         0               0

Change               -x            +x             +x

Equilibrium (0.709344 -x)         x               x

K_p = 11.5 = x×x / (0.965 -x)

solving, we get x = 0.67027

So partial pressure of PCl5 at equilibrium = 0.709344 - 0.67027 = 0.039074 atm

(c)   Partial pressure of PCl3 = Cl2 = 0.709344 atm

So total pressure = 0.709344+0.039074+ 0.67027= 1.418688 atm

Answer:

Energy released =  18.985 J

Explanation:

The  exponential decay of radioactive substance is given by -

N(t) = N₀ \(e^{-kt}\)

where

N₀ = initial quantity

k = decay constant

Half life, \(t_{1/2} = \frac{ln 2}{k}\)

⇒\(k = \frac{ln 2}{t_{1/2} }\)

Given,

N₀ = 12.5 + 3 = 15.5 × 10⁻⁶ gm

\(t_{1/2}\) = 32.6 + 18 = 50.6 × 10⁶ years

So,

\(k = \frac{ln 2}{50.6 * 10^{6} }\) = 1.361 × 10⁻⁸ year⁻¹

Now,

N(1) = 15.5 × 10⁻⁶  \(e^{-1.361*10^{-8} *1}\)

      = 15.49999978904

Now,

Substance decayed = N₀ - N(t)

                                 = 15.5 × 10⁻⁶ - 15.49999978904 × 10⁻⁶

                                 = 21.095 × 10⁻¹⁷ kg

⇒Δm = 21.095 × 10⁻¹⁷ kg

So,

Energy released = Δmc²

                           = 21.095 × 10⁻¹⁷ × 3 ×10⁸ × 3 × 10⁸

                          = 189.855 ×10⁻¹

                          = 18.985 J

⇒Energy released =  18.985 J