Calculate the percent composition of Hydrogen in C6H1206​. Periodic table question

Answer:

heating point for water - 100°

The melting point (MP) of a substance is the temperature at which it melts. A solid's melting point is a physical characteristic that can be used to identify a substance. Here the correct option is B.

The melting point of a solid is the temperature at which it begins to liquefy. A substance's normal melting point is its melting point under atmospheric pressure. Ice often melts at 0 degrees Celsius.

A physical process called melting or fusing causes a substance to change its phase from a solid to a liquid. This happens when the solid's internal energy rises, usually as a result of heat or pressure being applied, which raises the substance's temperature to the melting point.

Thus the correct option is B.

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Answer:

0.75M Fe²⁺

Explanation:

First, we need to balance the redox reaction in acidic medium. Then, we can obtain moles of KMnO4 and with the reaction moles and molarity of the Fe²⁺ solution:

Redox Balance:

Fe²⁺ → Fe³⁺ + 1e⁻

5e⁻ + 8H⁺ + MnO₄⁻ → Mn²⁺ + 4H₂O

___________________________

5Fe²⁺ + 5e⁻ + 8H⁺ + MnO₄⁻ → 5Fe³⁺ + 5e⁻ + Mn²⁺ + 4H₂O

Moles of KMnO₄:

70.0mL = 0.0700L * (0.150mol / L) = 0.0105 moles KMnO₄

Moles and molarity Fe²⁺:

0.0105 moles KMnO₄ * (5 moles Fe²⁺ / 1mol KMnO₄) = 0.0525 moles Fe²⁺

In 70.0mL = 0.0700L:

0.0525 moles Fe²⁺ / 0.0700L =

The balanced equation for the reaction between nitric acid and potassium iodide is: 8HNO₃ + 6KI → 3I₂ + 4NO + 4KNO₃ + 6H₂O

This equation represents a redox reaction, where nitric acid (HNO₃) acts as the oxidizing agent and potassium iodide (KI) acts as the reducing agent. The reaction results in the formation of potassium nitrate (KNO₃), iodine (I₂), nitrogen monoxide (NO), and water (H₂O).

In order to balance the equation, we need to make sure that the number of atoms of each element is equal on both sides of the equation. This is achieved by adjusting the coefficients in front of the chemical formulas.

In this case, we need to multiply the nitric acid by 8, the potassium iodide by 6, the iodine by 3, the nitrogen monoxide by 4, and the potassium nitrate and water by 4 and 6, respectively.

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When \(CO_{2}\) and \(H_{2} CO_{3}\) are both horizontal lines, the rate of the forward reaction is the same as the rate of the reverse reaction. The reaction is occurring at equilibrium, with no net change in the concentrations of reactants and products over time.

When the concentration of carbon dioxide \(CO_{2}\) and the concentration of carbonic acid \(H_{2} CO_{3}\) are both horizontal lines, it indicates that their concentrations remain constant over time. In such a scenario, the rate of the forward reaction is the same as the rate of the reverse reaction. A horizontal line on a concentration-time graph suggests that the concentrations of the reactants and products are not changing, implying that the reaction has reached equilibrium. At equilibrium, the rate of the forward reaction equals the rate of the reverse reaction. This is a fundamental principle of chemical equilibrium, described by the principle of microscopic reversibility.

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Answer: C2H5OH + 3O2-------=2CO2 + 3H2O

Explanation:

110 moles of O2 are consumed when 20 moles of C4H6 are combusted ; Based on the amount of O2 available, it is the limiting reactant in this equation.

A reaction in which substance reacts with the oxygen gas and producing energy in the form of light and heat is called as combustion reaction.

2 C4H6 + 11 O2 -> 8 CO2 + 6 H2O

(11 moles O2 / 2 moles C4H6) x 20 moles C4H6 = 110 moles O2

Therefore, 110 moles of O2 are consumed when 20 moles of C4H6 are combusted.

From the previous calculation, we know that 110 moles of O2 are consumed when 20 moles of C4H6 are combusted. This means that we need 20/2 = 10 moles of O2 to react with the available 20 moles of C4H6.

However, if we only have 8 moles of O2 available, then O2 will be the limiting reactant, as there is not enough O2 to react with all of the C4H6.

Therefore, based on the amount of O2 available, it is the limiting reactant in this equation.

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Answer:

Element 3

Explanation:

Properties of metals are:

- Being shiny

- Are good conductors of electricity

- Are good conductors of heat

- Have a high melting point

Element 3 has all of these properties, so it is most likely a metal.

Hope this helps!

Answer: 1 and 3

Explanation:

To calculate enthalpy change from Gibbs free energy, you can use the following equation:

    ΔH = ΔG + TΔS

Gibbs free energy is a thermodynamic property that is used to determine the amount of energy available to do work in a system. It is denoted by the symbol G and is defined as the difference between the enthalpy (H) and the product of the temperature (T) and entropy (S)

Gibbs free energy is a useful tool for predicting the direction of a chemical reaction and the spontaneity of a process. If the Gibbs free energy of a reaction is negative, the reaction is spontaneous and will proceed in the forward direction. If the Gibbs free energy of a reaction is positive, the reaction is non-spontaneous and will not proceed in the forward direction without the input of energy. If the Gibbs free energy of a reaction is zero, the reaction is at equilibrium and there is no net change in the system.

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No, air is not a pure substance. Because air contains other gases like Nitrogen, Carbon monoxide etc..,

Pentane is the limiting reactant.

C5H12 (l) + 8O2 → 5Co2 (g) + 6H2O (g)

1mol. of C5H12. reacts with. 8mol of O2

Molar mass of C5H12 = 8 g/mol

Molar mass of O2 = 10g/mol

8 g of C5H12 reacts with 8 × 32 = 256 g of O2

10 g of C5H12 reacts with 256 × 10/8 = 320 g of O2

Limiting  reagent is the substance which is not consumed when the chemical reaction is complete.

Pentane is the limiting reactant.

The first liquid among the alkanes, pentane is a colorless, flammable liquid that is lighter than water. At 900 ppm, it can be smelled, and at 5000 ppm, there is a substantial amount of odour strength. There are two other isomers that it can take, namely isopentane [(CH3)2CHCH2CH3] and neopentane [C(CH3)4]. It appears that straight-chain pentane and isopentane (2-methylbutane) have similar physical and physiological properties. In terms of its physical and physiological properties, neopentane (2,2-dimethylpropane) is comparable to butane. C5 pentane in air is equivalent to 3 mg m3 per part per million. A naturally occurring component of the main paraffin portion of crude oil and also present in natural gas, pentane is a five-carbon aliphatic molecule.

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Answer:

The actual value = 25.7 ml

The error = 15.6%

This means that the value of error = 0.156 * 25.7 = 4.0092 ml

Now, the error percentage found means that the student got the value either greater than the actual one with the value of error or less than the actual one with the value of error.

This means that the two possible readings are:

either : 25.7 + 4.0092  = 29.7092 ml

or : 25.7 - 4.0092  = 21.6908 ml

Explanation:

The term "partial pressure" refers to the amount of pressure that each gas in a mix exerts. A mole fraction of the a gas,x, can also be used to formulate Dalton's law.

The partial pressure formula: what is it?

Partial pressures can be calculated in one of two ways: 1) To determine the individual pressures of each gas in a mixture, use PV = nRT. 2) Determine the proportion of pressure from of the total pressure that may be assigned to each single gas by using the molar concentration of each gas.

What is the name for partial pressure?

The idea of partial pressure is derived from the fact so each individual gas contributes to the overall pressure in a given proportion, which corresponds to its partial pressure. In order to characterise all the pieces, it is essentially equivalent to taking a percent or proportion of the whole.

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Molar mass is the mass of one mole of a substance, and is often used in chemistry to calculate the number of moles in a given mass of a substance. To find the molar mass of a substance, we add up the molar masses of each element present in the compound.

In the case of C2H5OH, also known as ethanol, the molar mass can be found by adding up the molar masses of carbon, hydrogen, and oxygen.

First, we know that there are 2 carbon atoms present in the compound. The molar mass of carbon is 12.01 g/mol. So, the mass of 2 carbon atoms is 2 x 12.01 = 24.02 g/mol.

Next, we know that there are 6 hydrogen atoms present in the compound. The molar mass of hydrogen is 1.01 g/mol. So, the mass of 6 hydrogen atoms is 6 x 1.01 = 6.06 g/mol.

Finally, we know that there is 1 oxygen atom present in the compound. The molar mass of oxygen is 16.00 g/mol. So, the mass of 1 oxygen atom is 1 x 16.00 = 16.00 g/mol.

To find the molar mass of the compound, we add up the molar masses of the individual elements. So, the molar mass of C2H5OH is:

24.02 g/mol + 6.06 g/mol + 16.00 g/mol = 46.08 g/mol

Therefore, the molar mass of C2H5OH is 46.08 g/mol.

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Answer:

Brass does not bend as easily as copper.

Explanation:

Brass has more durability due to it having zinc in it.

Answer: Alloy strength

Explanation:

Copper and zinc atoms are different sizes. This distorts the regular lattice structure in brass, so layers of atoms cannot slide over each other so easily. This makes brass stronger than copper or zinc alone.

The mole fraction of ethanol in the solution is 0.1903, and the mole fraction of water in the solution is 0.8097.

To calculate the mole fraction of each component in the solution, we need to determine the number of moles of each component first.

The molar mass of ethanol (C2H5OH) is:

2(12.01 g/mol) + 6(1.01 g/mol) + 1(16.00 g/mol) = 46.07 g/mol

Number of moles of ethanol = mass/molar mass = 300 g / 46.07 g/mol = 6.5166 mol

The molar mass of water (H2O) is:

2(1.01 g/mol) + 1(16.00 g/mol) = 18.02 g/mol

The mole fraction of ethanol is:

moles of ethanol / total moles = 6.5166 mol / 34.2625 mol = 0.1903

The mole fraction of water is:

moles of water / total moles = 27.7459 mol / 34.2625 mol = 0.8097

Therefore, the mole fraction of ethanol in the solution is 0.1903, and the mole fraction of water in the solution is 0.8097.

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Approximately 24.55 cm^3 of oxalic acid must be added to sufficient water to give a 1.500 liter solution with a formal concentration of 0.300 F.

To find the volume of oxalic acid needed to make a 1.500 liter solution with a formal concentration of 0.300 F, we need to use the equation:

Formal concentration (F) = (moles of solute) / (volume of solution in liters)

First, we need to calculate the moles of oxalic acid required. The formal concentration (F) is given as 0.300, so:

0.300 = (moles of oxalic acid) / 1.500

Rearranging the equation, we find:

moles of oxalic acid = 0.300 * 1.500

moles of oxalic acid = 0.450

Next, we can calculate the mass of oxalic acid needed using its molecular mass:

mass of oxalic acid = moles of oxalic acid * molecular mass

mass of oxalic acid = 0.450 * 90.03

mass of oxalic acid = 40.5145 g

Finally, we can calculate the volume of oxalic acid needed using its density:

volume of oxalic acid = mass of oxalic acid / density

volume of oxalic acid = 40.5145 g / 1.65 g/cm^3

volume of oxalic acid = 24.55 cm^3

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According to the given statement, 1 mole of hydrogen gas and 0.5 moles of oxygen gas are produced from 1 mole of liquid water collected in separate 10 L containers at 1 atm. We have to determine whether the temperatures of the gases will be equal or not. Yes, the temperature of the gases will be equal.

Given:1 mole of hydrogen gas and 0.5 moles of oxygen gas are produced from 1 mole of liquid water collected in separate 10 L containers at 1 atm.

2H₂ + O₂ → 2H₂ONow, the mole ratio between H₂ and O₂ is 2:1. So the mole of H₂ is greater than that of O₂, which means hydrogen will be the limiting reactant. Let's find out the moles of H₂ and O₂ used:1 mole of H₂O produces 1 mole of H₂ and 0.5 moles of O₂∴ 1 mole of H₂O requires 0.5 mole of O₂0.5 mole of O₂ is used in the reaction So, the number of moles of H₂ used = number of moles of O₂ used = 0.5 moles.

The ideal gas law is: P V = n R T where, P = pressure V = volume of the gas  = number of moles of gas = universal gas constant T = temperature of the gas . Now, as the volume of both the gases is equal and the pressure of both the gases is equal, then we can compare their temperatures as: P₁V₁/T₁ = P₂V₂/T₂V₁ = V₂ and P₁ = P₂ .

So, P₁V₁/T₁ = P₂V₂/T₂ can be written as T₁/T₂ = n₂/n₁

By substituting the given values we get, T₁/T₂ = 0.5/1 = 1/2T₁ = 2T₂So, the temperature of the gases is in the ratio of 1:2. The temperature of oxygen gas is half of that of hydrogen gas, but the temperature of both the gases is not given so we cannot determine the actual value of the temperature of the gases.

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The reported molar absorptivity of red dye number three is 0.715 mol/L*cm. If a solution of red dye number three displays an absorbance of 1.358 and has a cuvette path length of 0.244 cm, you can use the Beer-Lambert law to calculate the concentration of the solution. The Beer-Lambert law is given by:

A = ε * c * l

Where A is the absorbance, ε is the molar absorptivity (0.715 mol/L*cm), c is the concentration, and l is the path length of the cuvette (0.244 cm).

Rearrange the equation to solve for the concentration (c):

c = A / (ε * l)

Substitute the given values:

c = 1.358 / (0.715 * 0.244)

Calculate the concentration:

c ≈ 7.724 mol/L

Therefore, the concentration of the red dye number three solution is approximately 7.724 mol/L.

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The neurotransmitter activated during the emergency situation is option A: norepinephrine.

A neurotransmitter and a hormone, norepinephrine is also known as noradrenaline. Dopamine is converted into norepinephrine, a neurotransmitter. Nerve cells in the brainstem region and a region close to the spinal cord produce norepinephrine. Your adrenal glands release norepinephrine, a hormone, in response to stress. The fight-or-flight response is a response that alters several bodily functions. Thus, it perceives danger as mentioned in the question.

The sympathetic nervous system, which is a component of your body's immediate "fight-or-flight" response to danger, produces norepinephrine. The flight-or-flight reaction is also referred to as the acute stress response in medicine.

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Step 1

The reaction:

Ca(OH)2 (aq) + 2 HBr (aq) => CaBr2 (aq) + 2 H2O (l) (compelted and balanced)

----------------

Step 2

Information provided:

0.0105 M HBr

125 mL of 0.0100 M Ca(OH)2

----------------

Step 3

The number of moles of Ca(OH)2:

Molarity (mol/L) = moles of Ca(OH)2/volume of the solution (L)

Volume = 125 mL x (1 L/1000 mL) = 0.125 L

Therefore,

Molarity x volume (L) = moles

0.0100 mol/L x 0.125 L = 1.25x10^-3 moles of Ca(OH)2

-----------------

Step 4

The number of moles of HBr, by stoichiometry:

Ca(OH)2 (aq) + 2 HBr (aq) => CaBr2 (aq) + 2 H2O (l)

1 mol Ca(OH)2 ------ 2 moles HBr

1.25x10^-3 moles ------ X

X = 1.25x10^-3 moles x 2 moles HBr/1 mol Ca(OH)2

X = 2.5x10^-3 moles HBr

----------------

Step 5

The volume of HBr needed:

Molarity = moles of HBr/volume of solution (L)

Volume = moles of HBr/molarity

Volume = 2.5x10^-3 moles HBr/0.0105 mol/L

Volume = 0.238 L

Volume = 0.238 L x (1000 mL/1 L) = 238 mL

Answer: 238 mL or 0.238 L (there are no matches)

Using the change of base rule to find the logarithm to four decimal places. the correct answer is 11.4235.

To find the logarithm of 143.2 using the change of base rule, we can choose any base we prefer. Let's use base 10 and natural logarithm (base e) for this calculation.

First, we'll use the change of base formula, which states that log(base b) x = log(base c) x / log(base c) b. In this case, we'll calculate log(base 10) 143.2.

We'll use the natural logarithm (ln) as our intermediary step. The natural logarithm of 143.2 can be calculated as ln(143.2).

Using a calculator, we find that ln(143.2) is approximately 4.9628.

Next, we need to calculate log(base 10) e, which is the logarithm of e with base 10. Using a calculator, we find log(base 10) e is approximately 0.4343.

Finally, we apply the change of base formula:

log(base 10) 143.2 ≈ ln(143.2) / log(base 10) e
                ≈ 4.9628 / 0.4343
                ≈ 11.4235

Rounding to four decimal places, the logarithm of 143.2 using base 10 is approximately 11.4235.

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The molar mass of Br is 79.904 grams/mole and the molar mass of Cl is 35.453 grams/mole.

There are 3 Cl atoms so we'll multiply it's molar mass by 3. So:

35.453 x 3 = 106.359

Now we add this number to the molar mass of Br and we get:

106.359 + 79.904 = 186.263

The molar mass of BrCl3 is 186.263 grams/mole

Now we just multiply this number by the amount of moles in the question which is 204.

186.263 x 204 = 37997.652 g which is 37.997652 kg or 38.0 kg if significant figures are important.

To solve this problem, we could use the Boyle's law since there's a sample of ideal gas and temperature is constant.

Boyle's law tells us that:

Replacing the values of the problem:

The new volume V equals 5.6L.

Answer:

Different objects float at different levels in the water because as most regular objects are lowered into the surface of water, the upward push of the water steadily increases until it is in balance with the weight force of the object, and the object then continues floating at this level with the two forces in balance.

Answer:

A burning match represents an exothermic reaction. The chemicals release energy in the form of heat and light as the reaction progresses.

Explanation:

Sample Response

Answer:

yeah

Explanation:

it is a form of stored energy that is released when needed by a conversion chemical energy therefore it is a form of potential energy

hope this helps

Answer:

It is Soluble

Explanation:

Name- Magnesium acetate

It dissolves easily in water and alcohol.

Answer:

When you are in the laboratory and take a direct sniff the chemicals you are using, you run the risk of damaging your mucous membranes or your lungs. When its necessary to smell chemicals in the lab, the proper technique is to cup your hand above the container and waft the air towards your face.

Gas is a naturally odourless substance, but the completely harmless artificial smell is added to make it more detectable. The substance is called mercaptan and gives off a strong sulphur like smell.

Answer:

New Answer is : B - Glaciers scraped across the surface and altered landscapes and the course of rivers.

Explanation:

Edge 2020

The impact of glaciers on the surface is that glaciers scraped across the surface and altered landscapes and the course of rivers.

A glacier refers to a heap of ice that has stayed there for a large number of years. The earth is filled with many glaciers and about 90% of fresh water are trapped in glaciers.

The impact of glaciers on the surface is that glaciers scraped across the surface and altered landscapes and the course of rivers.

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When a metal is placed into an acid, a chemical reaction called a redox reaction occurs. In this process, the metal loses electrons (oxidation) and the acid gains electrons (reduction). This results in the formation of a salt and hydrogen gas is released. The general equation for this reaction is:

Metal + Acid → Salt + Hydrogen gas

For example, when zinc is placed into hydrochloric acid, the reaction is:

Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)

In this reaction, zinc is oxidized to form zinc chloride (ZnCl₂) while hydrogen ions (H⁺) in the hydrochloric acid are reduced to form hydrogen gas (H₂).

The release of hydrogen gas can be observed as bubbles forming in the solution. This process demonstrates the reactivity of metals with acids, which depends on the metal's position in the reactivity series.

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