How many moles can be found in 22g of Co2? A. 1.5 B. 2 c. 480 D. 0.5 show work

Answer:

the molar mass of propane (c3H8) is

12*3+1*8

=36+8=44

Answer:

Explanation:

The direct reaction of a carboxylic acid with an amine would be expected to be difficult because the basic amine would deprotonate the carboxylic acid to form a highly unreactive carboxylate.

Answer:

\(\huge\boxed{\sf Ribosomes}\)

Explanation:

\(\rule[225]{225}{2}\)

The conclusion that can be drawn about lupus is that: Lupus can affect almost every system of the body. Option D. is the correct answer.

What is Lupus (SLE)?

This refers to a disease that happens when your body's immune system attacks your own tissues and organs (autoimmune disease).

Lupus (SLE) can affect the following body parts: joints, skin, kidneys, blood cells, brain, heart and lungs.

Symptoms differ from person to person but can include fatigue, joint pain, rash and fever. These can get worse from time to time (flare up) and then improve.

Lupus has no cure. Current treatments are based on improving quality of life by controlling symptoms and minimizing flare-ups. This starts with lifestyle modifications, including sun protection and diet. Also, disease management includes medication such as anti-inflammatories and steroids.

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The elements that would form metallic bonds are as follows:

A metallic bond in chemistry is a chemical bond in which mobile electrons are shared over many nuclei and therefore, leads to electrical conduction.

Metallic bonds are formed strictly by metallic elements in the periodic table.

Iridium is a chemical element with symbol Ir with an atomic number of 77. It is a very hard, brittle, silvery-white transition metal.

Iron is also a metallic chemical element with symbol Fe.

Therefore, the elements that would form metallic bonds are as follows:

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Answer:

Iridium

Cadmium

Iron

Explanation:

Test.

Answer:

the study of living organisms, divided into many specialized fields that cover their morphology, physiology, anatomy, behavior, origin, and distribution

Explanation:

the plants and animals of a particular area.

"the biology of Chesapeake Bay"

the physiology, behavior, and other qualities of a particular organism or class of organisms.

"human biology"

Answer:

44.62 kJ

Explanation:

Firstly, we calculate the energy needed to heat the liquid (ethyl alcohol) by using the formula:

Q = m × c × ∆T

Where;

Q = Amount of heat (J)

m = mass (g)

c = specific heat of ethyl alcohol = 2.138 J/g°C

∆T = change in temperature (°C)

According to the information given in this question;

Q = ?, m = 50.0g, ∆T = (78.4°C - 60°C) = 18.4°C

Therefore, using Q = mc∆T

Q = 50 × 2.138 × 18.4

Q (amount of energy needed to heat ethyl alcohol) = 1966.96 J

Next, we calculate and add the amount of heat needed to vaporize by using the formula;

How many kilojoules of energy are required to heat 50.0 g of ethyl alcohol from 60.0 °C to 78.4 °C and vaporize it? The specific heat of ethyl alcohol is heat of vaporization is 853 J/g.

Answer:

About 200 moles water

Explanation:

O2 is the limiting reactant, and it allows for 193.75 moles of water to be produced. Good luck on your assignment!

Answer:

Step-by-Step Explanation:

The principal rules include:

a) Bases contains higher pH compared to acids

b) The stronger acid contains reduced pH.

c) Stronger acid contains higher Ka. Hence, acids possessing higher Ka contain lower pH.

d) Stronger base contains higher Kb. Hence, bases possessing higher Kb contain higher pH.

Combining all these rules and putting them into action; in order of increasing pH, we have:

HF (1); HNO2 (2); NH3 (3); CH3NH2 (4)

For the second part:

a) NaCl occurs to be the salt of both strong acid & strong base. For that reason, it is a neutral salt with a pH of 7.0

b) NaF is a basic salt because, it serves as salt of strong base as seen in NaOH and that of a weak acid(e.g HF).

However, it produces Na^+ & F^- ions when it exist in solution.

where;

F^-  = strong conjugate base for a weak acid HF.

Thus, the Kb of \(F^-\) = \(\dfrac{10^{-14} }{6.8 \times 10^{-4}}\) = \(1.47 \times 10^{-11}\)

Now, the \([OH^-]\) in 0.1 M of NaF solution = \((0.1 \times 1.47 \times 10^{-11} ) 0.5\)

\(= 1.21 \times 10^{-6} \ M\)

\(pOH = -log [OH^-]\)

\(pOH = -log (1.21 \times 10^{-6} )\)

\(pOH = 5.92 \\ \\ pH = 14 - pOH \\ \\ pH = 14 - 5.92 \\ \\ \mathbf{pH = 8.08}\)

c) \(KNO_2\) occurs to be a basic salt because it is a salt of both strong base (KOH) and a weak acid \((HNO_2).\)

yields in solution.

Kb of \(NO^{2-}\) =\(\dfrac{10^{-14}}{(4.5 \times 10^{-4})}\) = \(2.2 \times 10^{-11}\)

Now, the \([OH^-]\) in 0.1 M of \(KNO_2\) solution = \((0.1 \times 2.22 \times 10^{-11})\times 0.5\)

\(= 1.49 \times 10^{-6} \ M\)

\(pOH = -log[OH^-]\)

\(pOH = -log (1.49 \times 10^{-6} )\)

\(pOH = 5.83\\ \\ pH = 14 - pOH \\ \\ pH = 14 - 5.83 \\ \\ \mathbf{pH = 8.17}\)

d)

NH_4Cl occurs to be an acidic salt because it is a salt of both weak base  and a strong acid (HCl)

NH_4Cl yields \(NH_4^+\) and \(Cl^-\) when present in a solution.

Ka of \(NH_4^+\) = \(\dfrac{10^{-14}}{1.8 \times 10^{-5}}\)

\(= 5.56 \times 10^{-10}\)

Now, the \([H^+] = (0.1 \times 5.56 \times 10^{-10}) 0.5\)

\(= 7.45 \times 10^{-6}\)

\(\mathbf{= 5.12}\)

Thus, the order of the pH is:

NH_4Cl (1); NaCl (2); NaF (3); KNO_2 (4)

Answer:

1. NaCl

2. NH4F

3. MgO

4.LiCl

5. KI

6. CaO

Explanation:

In that order

Answer:

10 core electrons

Explanation:

Answer:

Magnesium has 10 core electrons

Answer:Adding or removing energy from matter causes a physical change as matter moves from one state to another. For example, adding thermal energy (heat) to liquid water causes it to become steam or vapor (a gas). And removing energy from liquid water causes it to become ice (a solid)

Explanation:

It is the 4th scenario is the dependent event. There are 7 gold tokens and 4 silver tokens in a cup. The first student randomly draws a gold token and keeps it. A second student randomly draws a gold token from the cup.

The fouth scenario is a dependent event because the probability of the second student drawing a gold token is affected by the outcome of the first student's draw.

If the first student draws a gold token, then there are only 6 gold tokens left in the cup, the probability changes. but  if the first student does not draw a gold token, then there are 7 gold tokens left in the cup, the probability will remain the same

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Barium forms cation : Ba²⁺

Given

Barium element

Required

Ion type

Solution

Barium with the symbol Ba is an alkaline earth metal element having the atomic number 56

Electron configuration of Barium: [Xe] 6s2

If we look at this configuration, then Barium will try to achieve stability by removing 2 electrons so that the electron configuration is the same as the noble gas Xenon (Xe)

Because it removes 2 electrons, Barium has the number of protons> the number of electrons so that the charge is positive and forms a cation

\(98.56 dm^3\) of oxygen at STP would be required to react completely with 38.8g of propane.

Given that :

molar mass of propane = 44 g/mol

mass of propane = 38.8 g

∴ Moles present in 38.8 g of propane = \(\frac{38.8}{44}\) = 0.88 mole

applying rule of balanced equations

1 mole of propane = 5 moles of oxygen

0.88 mole of propane =  5 * 0.88 = 4.4 moles of oxygen

Note : volume of 1 mole of oxygen at STP = \(22.4 dm^3\)

∴Total volume of oxygen required at STP = 22.4 * 4.4 = \(98.56 dm^3\)

Hence we can conclude that the volume of oxygen at STP required to react completely \(98.56 dm^3\)

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Answer:

When iron wool combusts, it reacts with oxygen from the air to form iron oxide. Iron oxide is a solid, so the oxygen atoms from the air add to the mass on the balance. The balance tips as the iron wool reacts with the oxygen to form solid iron oxide. from.

Explanation:

The equation that relates A and W, considering the desired 15% acetic acid concentration, is 3W = 2.55M.

The equation A = (3/17)W represents the relationship between the mass of acetic acid (A) and the mass of water (W) in the mixture. It states that the mass of acetic acid is equal to three seventeenths (3/17) of the mass of water.

Since the company wants the acetic acid to be 15% of the total mass of the mixture, we can set up another equation to represent this requirement. Let M be the total mass of the mixture. The mass of acetic acid (A) is 15% of the total mass, so we have A = 0.15M.

Now we can substitute A in terms of W from the first equation into the second equation: (3/17)W = 0.15M. We can simplify this equation by multiplying both sides by 17 to get 3W = 2.55M.

This equation allows the company to calculate the mass of water (W) required for a given mass of acetic acid (A) to maintain the desired concentration in the mixture.

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Answer:

The physical and human forces that work in combination to form and transform the world, for example, erosion, the water cycle, migration or urbanisation. Geographical processes can operate within and between places.

Answer:

group 1 element 6

group 2 element 3

group 11 element 1

group 14 element 2

group 17 element 4

group 18 element 5

Explanation:

Answer:

Explanation:

group 1 element 6

group 2 element 3

group 11 element 1

group 14 element 2

group 17 element 4

group 18 element 5

Answer:

magnesium atom

The most common and stable type of magnesium atom found in nature has 12 protons, 12 neutrons, and 12 electrons

Answer:

2K3PO4(aq) + 3MgCl2(aq) → Mg3(PO4)2(s) + 6KCl(aq)

Explanation:

K3PO4(aq) + MgCl2(aq)→ Mg3(PO4)2(s) + KCl(aq) (unbalanced)

2K3PO4(aq) + 3MgCl2(aq) → Mg3(PO4)2(s) + 6KCl(aq)

Reactants:       Products:

K: 3x2=6           K: 1x6=6

P: 1x2=2            P: 1x2=2

O: 4x2=8          O: 4x2=8

Mg: 1x3=3        Mg: 3x1=3

Cl: 2x3=6         Cl: 1x6=6

Therefore the equation is balanced. Hope this helps.

The required balanced chemical equation CH₄ + 2O₂ = CO₂ + 2H₂0

Combustion is a chemical reaction between a fuel and an oxidant that produces an oxidized product.

Usually, its a reaction between a hydrocarbon and oxygen to yield carbon dioxide, water, and heat.

Hydrocarbon + Oxygen = Carbon Dioxide + Water + Heat

Balanced chemical equation is CH₄ + 2O₂ = CO₂ + 2H₂0

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Marjorie's unknown substance is sodium chloride NaCl.

The substance is insoluble in CCl₄. The density of the substance is 2.2 g/mL.

Solubility:

The fact that the chemical is insoluble in CCl₄ (tetrachloromethane), as indicated in the statement, indicates that the substance is polar in nature. Only C₁₀H₈ of the choices is soluble in CCl₄ since they are both non-polar by nature and related substances dissolve similarly. C₁₀H₈ is therefore disregarded.

Density:

There are now only three possibilities left. SiO₂, FeCl₃, and NaCl. The student discovered that the material has a density of 2.20 g/ ml. This is quite similar to sodium chloride's density (i.e., 2.165 g/mL). As a result, sodium chloride is most likely the material the student is working with.

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\(\qquad\qquad\huge\underline{{\sf Answer}}\)

\( \textbf{Let's balance the given equation :} \)

It's all balanced now ~

\( \sf{Al_2(SO_4)_3 + \boxed3 \: Ca(OH)_2 → \boxed2 \: Al(OH)_3 + \boxed3 \: CaSO_4}\)

The amount of heat transferred to the sample of sodium is 332,699.149.

The amount of heat absorbed or released by a substance can be calculated using the following formula;

Q = mc∆T

Where;

According to this question, 898.3g sample of sodium experiences a temperature change of +301.11 K. The specific heat capacity of sodium is 1.23 J/(g-K).

Q = 898.3 × 1.23 × 301.11

Q = 332,699.149 J

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Approximately 166.67 mL of water needs to be evaporated from 250 mL of 1 M Ca(OH)2 to make it 3 M.

The relationship between the initial and final concentrations and volumes must be taken into account.

Given: Initial concentration \((C^1) = 1 M Initial volume (V^1) = 250 mL\)

\((C^2) = 3 M final concentration\)

We can use the equation:

\(C^1 * V^1 = C^2 * V^2\)

Where:

\(V^2\)is the final volume of the solution

Rearranging the equation to solve for V2:

\(V^2 = (C^1 * V^1) / C^2\)

Substituting the given values:

\(V^2 = (1 M * 250 mL) / 3 M\)

\(V^2 = 250 mL / 3\)

\(V^2\) ≈ \(83.33 mL\)

To find the amount of water that needs to be evaporated, we subtract the final volume from the initial volume:

Amount of water to be evaporated = \(V^1 - V^2\)

Amount of water to be evaporated = 250 mL - 83.33 mL

Amount of water to be evaporated ≈ 166.67 mL

Therefore, approximately 166.67 mL of water needs to be evaporated from 250 mL of 1 M Ca(OH)2 to make it 3 M.

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Answer:

solution resists changes in pH

Explanation:

the inherent property of buffers is to resist change to ph even when acids and bases are added. when the base is added, it is quickly neutralized by the conjugate acid, so the ph won't change.

Answer:

B: The solutions resists changes in pH.

Explanation:

Buffer reactions maintain stable pH of solutions.

Covalent and ionic bonds refer to atoms joined by their electrons. In covalent bonds, electrons are shared by the involved non-metal atoms. Option 2 is correct. Occurs due to the sharing of electrons between two non-metal atoms.

Both of them, covalent and ionic bonds, are chemical bonds that can form between atoms.

Ionic bonds occur between atoms with different electronegativity. When they bind, they transfer electrons from one atom to the other creating ions with opposite charges that attract each other.

Ionic compounds are formed by anions and cations.

• Cations are positive ions derivated from metals.

• Anions are negative ions derivated from non-metals.

The metal atoms share its electrons with the non-metal ones, creating stable configurations. Ionic bonds do not create molecules.

Covalent bonds are formed between atoms share electrons to be more stable. Atoms involved share electrons equally, creating a strong bond between them.

Covalent bonds are usually formed between non-metal atoms.

Option 2 is correct. Occurs due to the sharing of electrons between two non-metal atoms

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Complete question

A template of a Venn diagram representing common and differentiating characteristics of covalent and ionic bonds is shown.

Which of the following characteristics can be written only in space C?

On the diagram,

Options,

The correct answer is "decendent." Embalming authorization may be given by the bailee, next of kin, or spouse, but not by the decedent.

The term "decedent" refers to the person who has died; they are unable to give consent for embalming or any other post-mortem procedures. According to legal and cultural customs, the choice to embalm is often taken by the designated representative, such as the bailee (person in charge of the body), next of kin, or spouse.

Hence, embalming authorization may be given by the bailee, next of kin, or spouse, but not by the decedent.

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