What is the total number of atoms in a 75 g sample of zinc?

Answer:

1.6/0.100

= 16

16 x 5

= 80

now you need to multiply as you divided before so the answer is

=.80

Your welcome

When the reaction of  Grignard reagent reacted with methanol will yield a tertiary alcohol. Therefore, Option C tertiary alcohol is correct.

Contains a carbon-metal link, Grignard reagents are chemicals used in catalysis. They generally result from the anhydrous reaction of magnesium metal with an alkyl or aryl halide. Because of their high reactivity, Grignard reagents frequently act as nucleophiles in organic reactions.

An alkyl group from a Grignard reagent binds to the oxygen atom of methanol (CH3OH) when it interacts with the methanol, breaking the carbon-metal connection. A precursor alkoxide is created as a result. The equivalent alcohol is then produced by protonating the intermediate alkoxide.

The reaction of a Grignard reagent with methanol leads to the formation of a tertiary alcohol.

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Answer:

The heat Q transferred to cause a temperature change depends on the magnitude of the temperature change, the mass of the system, and the substance and phase involved. (a) The amount of heat transferred is directly proportional to the temperature change.

Hope it helps, BE SAFE! :3

Answer:

Helium has atomic mass  4.002602.

So the answer to yr question is helium.

Two characteristics of a calorimeter that are necessary for successful heat measurement are good thermal insulation to minimize heat loss and a temperature measurement device to accurately measure temperature changes.

A calorimeter works by measuring the heat exchanged between two substances in a chemical or physical process. The substances are placed in the calorimeter and allowed to reach thermal equilibrium, and the temperature change of the system is measured to calculate the amount of heat transferred.

A bomb calorimeter is designed for measuring the heat of combustion of a substance in a sealed container under constant volume conditions, while a coffee cup calorimeter is a simpler design used for measuring the heat of reaction of a substance in an open container under constant pressure conditions. The bomb calorimeter is typically more accurate but also more complex and expensive to use.

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Answer:

98.356 ohms is the answer

Answer:

The volume of the liquid should be measured before it is heated.  

Explanation:

Because During an experiment to test how a variable changes a substance, it is important to first observe and record the characteristics of the substance before the variable is introduced. In this case, the variable is heat energy.  

Answer:

Huh

Explanation:

I don't understand if you asked a question or just wrote a statement

Sodium carbonate, also known as washing soda or soda ash, has a wide range of applications. Sodium carbonate can be naturally occurring or synthetically produced through various methods, including the Solvay process, which is the most common method of industrial production.

Sodium carbonate, also known as washing soda or soda ash, has many uses, including:

1) Cleaning agent: Sodium carbonate is an effective cleaning agent due to its alkaline nature. It is used in laundry detergents and household cleaners to remove stains and grease from clothes and surfaces.

2) Industrial applications: Sodium carbonate is used in a variety of industrial applications. It is used in the production of glass, pulp and paper, and soaps and detergents. It is also used as a water softener and pH regulator in chemical processes.

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Answer:

The ozone layer is a layer of the Earth's atmosphere that protects us from the sun's harmful UV radiation.

A chemical equation is said to be balanced when the total charge and the number of atoms for each component of the reaction are the same for both the reactants and the products.

Balanced molecular equation:

NaOH(aq) + HNO3(aq) -> NaNO3(aq) + H2O(l)

Total ionic equation:

Na+(aq) + OH-(aq) + H+(aq) + NO3-(aq) -> Na+(aq) + NO3-(aq) + H2O(l)

Net ionic equation:

OH-(aq) + H+(aq) -> H2O(l)

The sum of the coefficients for the net ionic equation is 3.

Lye and caustic soda are other names for sodium hydroxide, an inorganic substance having the formula NaOH. It is a white, solid ionic substance made up of the cations sodium (Na+) and the anions hydroxide (OH).

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To prepare a 0.12 M solution of FeCl₃, the amount of solid FeCl₃ to be dissolved in a given volume of solvent will be 9.72 grams.

Given,

Molarity of FeCl₃ (M)= 0.12 M

The molecular weight (m) of FeCl₃ is  = 162 gm

The volume of the solution (V) to be prepared is =500 ml

The amount of FeCl₃ to be dissolved to make a 0.12 M solution is= x

So,

MV= x ÷ m × 1000

0.12× 500 = x ÷ 162 × 1000

x = 60 × 162 ÷ 1000

x= 9.72 gm

So 9.72 grams of FeCl₃ is dissolved to make 500 ml of 0.12 M solution.

For preparing 0.4 M HCl from 4M HCL:

If we need to make 500 ml of solution with 0.4M of HCL, then we use the formula:

M₁V₁= M₂V₂

0.4 × 500= 4 × x

x= 50 ml

So 50 ml of 4M HCL is taken to make 0.4 M HCL.

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Answer:

Explanation:

this guy on brainly already did it:

Alleei

Virtuoso

4.8K answers

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Answer :  The work done for path A and path B is -685.3 J and -478.1 J  respectively.

Explanation :

To calculate the work done for path A :

First we have to calculate the moles of the gas.

where,

= initial pressure of gas  = 2.57 atm

= initial volume of gas  = 3.42 L

n = moles of gas  = ?

R = gas constant = 0.0821 atm.L/mol.K

T = temperature of gas  = 298 K

Now put all the given values in the above formula, we get:

According to the question, this is the case of isothermal reversible expansion of gas.

As per first law of thermodynamic,

where,

= internal energy

q = heat

w = work done

As we know that, the term internal energy is the depend on the temperature and the process is isothermal that means at constant temperature.

So, at constant temperature the internal energy is equal to zero.

The expression used for work done will be,

where,

w = work done on the system = ?

n = number of moles of gas  = 0.359 mole

R = gas constant = 8.314 J/mole K

T = temperature of gas  = 298 K

= initial volume of gas  = 3.42 L

= final volume of gas  = 7.39 L

Now put all the given values in the above formula, we get :

Thus, the work done of path A is, -685.3 J

To calculate the work done for path B :

The formula used for isothermally irreversible expansion is :

where,

w = work done

= external pressure = 1.19 atm

= initial volume of gas = 3.42 L

= final volume of gas = 7.39 L

Now put all the given values in the above formula, we get :

Thus, the work done of path B is, -478.1 J

Answer:

+5

Explanation:

it hs 5 more protons thant electrons, so it has a positive charge of 5

The symbol for the ion is +5

Therefore, the symbol is +5

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we can determine the enthalpy of reaction for the hypothetical reaction A2X4(l) + X2(g) → 2AX3(g) using the following steps:

Hess's Law of Constant Heat Summation  states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes.

The law is  Hess's Law  of Constant Heat Summation  is described as a manifestation that enthalpy is a state function.

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Answer:

958 g is the mass of LiOH that can react with all the CO₂

Explanation:

CO₂(g) + 2 LiOH(s) → Li₂CO₃(aq) + H₂O

We think in the reaction:

1 mol of carbon dioxide can react with 2 moles of lithium hydroxide.

First of all, we convert the mass of our reactant to mol:

880 g . 1mol /44g = 20 moles

As ratio is 1:2, 20 moles of CO₂ will react with 40 moles of LiOH.

Let's determine the mass:

40 mol .  23.95 g /1mol = 958 g

Answer:

Explanation;

Here, we want to get the volume of KBr that would be required

Mathematically, from the dilution formula, we have it that:

We have it that:

C1 is the concentration of the KBr initially before dilution with water which is 0.2M

V1 is the initial volume that we want to calculate

C2 is the final concentration after dilution which is 0.0715 M

V2 is the final volume which is 175mL

Substituting the values, we have it that:

Answer:

Maximum expected yield = 87.2%

Explanation:

Equations of reactions:

Main reaction: N₂O₄(l) + 2N₂H₄(l) ---> 3N₂(g) + 4H₂O(g)

Side reaction:  2N₂O₄(l) + N₂H₄(l) ----> 6NO(g) + 2H₂O(g)

Molar mass of N₂O₄ = 92 g/mol; molar mass of N₂H₄ = 32 g/mol; molar mass of N₂ = 28 g/mol; molar mass of of NO = 30 g/mol; molar mass of water = 18 g/mol

In the main reaction, 92 g of N₂O₄ reacts with 2 * 32 g of N₂H₄ to produce 3 * 14 g of N₂.

101.1 g of N₂O₄ will react with 2 * 32 * 101.1 / 92 g of N₂H₄ = 70.33 g of N₂H₄

N₂O₄ is the limiting reactant

101.1 g of N₂O₄ will react to produce 3 * 14 * 101.1 / 92 g of N₂ =  46.15 g of  N₂

In the side reaction, (6 * 30 g) of NO  is produced  from (2 * 92 g) of N₂O₄ and 32 g of N₂H₄

12.7 g of N₂O₄ will be produced from ( 2 * 92 * 12.7/180 g) of N₂O₄ and (32 * 12.7/180) g of N₂H₄ to produce

mass of N₂O₄ used = 12.98 g

mass of N₂H₄ used = 2.26 g

mass of N₂O₄ left for main reaction = 101.1 - 12.98 = 88.12 g

mass of N₂H₄ left for main reaction = 101.1 - 2.26 = 98.84 g

In the main reaction, 92 g of N₂O₄ reacts with 2 * 32 g of N₂H₄ to produce 3 * 14 g of N₂

88.12 g of N₂O₄ will react with 2 * 32 * 88.12 / 92 g of N₂H₄ = 61.30 g of N₂H₄

N₂O₄ is the limiting reactant.

88.12 g of N₂O₄ will to react produce 3 * 14 * 88.12 / 92 g of N₂ =  40.23 g of  N₂

Percentage yield = (theoretical yield/actual yield) * 100%

Percentage yield = (40.23/46.15) * 100% = 87.2%

Therefore, maximum expected yield = 87.2%

The point group of porphyrin is D4h, and the point group of H2TPP (dihydrogen tetraphenylporphyrin) is D2h.

What is porphyrin ?

Porphyrins are a group of organic compounds that have a characteristic heterocyclic macrocycle structure known as a porphyrin ring. The porphyrin ring is composed of four pyrrole subunits linked together by methine bridges. Porphyrins are widely distributed in nature, and they are essential components of many biological molecules, including hemoglobin, myoglobin, and chlorophyll.

In addition to their biological roles, porphyrins have important applications in materials science, catalysis, and medicine. For example, porphyrins can be used as photosensitizers in photodynamic therapy, a treatment for cancer and other diseases that involves the activation of light-sensitive drugs to destroy cancer cells. Porphyrins also have interesting optical and electronic properties that make them useful in the development of sensors, photovoltaic cells, and other electronic devices.

The point group of porphyrin is D4h, and the point group of H2TPP (dihydrogen tetraphenylporphyrin) is D2h.

Porphyrin has a fourfold rotation axis (C4), four twofold rotation axes (C2), two mirror planes (σh), and a center of inversion (i), resulting in the point group D4h.

H2TPP is a derivative of porphyrin, but it lacks one of the four phenyl groups. Therefore, it has only two perpendicular mirror planes (σh) and a C2 rotation axis, resulting in the point group D2h.

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Answer:

A. The reaction shifts to the right (products) and the concentrations of I and H₂ decrease.

Explanation:

If gas is removed from the system at equilibrium, the system will try to compensate for the loss by shifting the reaction in a direction that produces more gas molecules. This is known as Le Chatelier's principle, which states that a system at equilibrium will respond to a disturbance by shifting in a way that minimizes the effect of the disturbance.

In this case, since gas is being removed from the system, the reaction will shift to the side that produces more gas molecules. Looking at the balanced equation, we can see that 2HI(g) has a greater number of gas molecules compared to H₂(g) and I₂(g). Therefore, the system will shift to the right (products) to produce more HI(g) and reestablish equilibrium.

Answer:

978 J

General Formulas and Concepts:

Thermodynamics

Specific Heat Formula: q = mcΔT

Explanation:

Step 1: Define

[Given] c = 4.18 J/g K

[Given] m = 6.00 g

[Given] ΔT = 75.0 °C - 36.0 °C = 39.0 °C

[Solve] q

Step 2: Find q

Step 3: Check

Follow sig fig rules and round. We are given 3 sig figs.

978.12 J ≈ 978 J

Answer:

I don't remember this topic very well.

Explanation:

if we want to increase 1C° of 1 gram water. we must use 4.18 joules energy that 75-36= 39 C° for 6 gram H2O we should use 6*39*(4.18) joules

Answer: it would release heat because the thermal energy it absorbed to become a gas. so it would release heat. hope this helps :)

Explanation:

Answer:

D

Explanation:

Answer: True

Explanation:

Q methane = Q water

Q = mcΔt

mass water = V x ρ = 1 L x 1 kg/L = 1 kg

298 K to 373K = 25 °C to 100 °C

c water = 75.2 J/mol K = 4.2 J / g °C = 4200 J/kg °C

Q water = 1 x 4200 x (100 - 25)

Q water = 315000 J

Q methane = Q water = 315000 J = 315 KJ

n (mol) methane = ΔH/Q = 890.4 / 315 = 2.83

PV = nRT

V = nRT/P

V = 2.83 x 0.082 x 298/1

V = 69.15 L

Answer: Rs. 1,100

Explanation:

Compound interest calculation at three years:

2,200 = Amount * (1 + r) ³

Compound interest at six years.

4,400 = Amount * (1 + r) ⁶

Divide them to eliminate variables:

4,400/ 2,200 = (Amount * (1 + r) ⁶) / (Amount * (1 + r) ³)

2 = (Amount * (1 + r) ³)

If (Amount * (1 + r) ³ is 2 then Amount at 3 years is:

2,200 = Amount * 2

Amount = 2,200 / 2

= Rs. 1,100

Answer:

Radiocarbon measurement or radiocarbon dating is a method that is used to measure the age of the carbon-based material in living organisms.

Radiocarbon dating is able to estimate age of fossils that are younger than 50,000 years and unable to measure things that died longer than 200,000 years ago because fossils that are too old do not contain carbon or carbon get vanished from too old fossils of organisms. Some of the fossils also get contaminated due to environmental conditions and during teh collection or preservation process.

Thus,  radiocarbon measurement is useless when trying to measure most rocks older than 50,000 years.