sing standard thermodynamic data at 298k, calculate the entropy change for the surroundings when 1.66 moles of n2(g) react at standard conditions.

The pH of a HNO3 solution with a concentration of [4.5 x 10-3] is approximately 2.35.

pH is a measure of the acidity or alkalinity of a solution and is defined as the negative logarithm (base 10) of the hydrogen ion concentration. In this case, we have a HNO3 solution with a concentration of [4.5 x 10-3]. To find the pH, we need to calculate the hydrogen ion concentration first.

The concentration [4.5 x 10-3] represents 4.5 multiplied by 10 raised to the power of -3. Therefore, the hydrogen ion concentration is 4.5 x 10-3 mol/L. Since the pH is the negative logarithm of the hydrogen ion concentration, we can calculate it as follows:

pH = -log10(4.5 x 10-3) ≈ 2.35

Therefore, the pH of the HNO3 solution with a concentration of [4.5 x 10-3] is approximately 2.35.

Learn more about pH

brainly.com/question/2288405

#SPJ11

B. A circle.

The center void shape that generates the most thrust in a solid fuel rocket is a circle.

What is Fuel?

Fuel is a substance that is used to produce heat or energy through combustion or other chemical reactions. It can be in the form of a solid, liquid, or gas and is typically used to power engines, generators, or heating systems. Examples of fuels include gasoline, diesel, natural gas, coal, wood, and propane. The choice of fuel depends on factors such as availability, cost, energy content, and environmental impact.

This is because a circular shape allows for the most efficient burning of the fuel, with the flame front moving evenly in all directions. Other shapes, such as a heart, triangle, or tree with branches, can cause uneven burning and may result in less thrust.

Learn more about Fuel from the given link

https://brainly.com/question/10172005

#SPJ1

Answer:

Explanation:

D.
tree with branches

A carbon atom has six protons, which are positively charged particles found in the nucleus of the atom. It also has six neutrons, which are uncharged particles also found in the nucleus.

Surrounding the nucleus are six electrons, which are negatively charged particles that orbit the nucleus in shells or energy levels. The first energy level of a carbon atom contains two electrons, while the second energy level contains four electrons. The first energy level is closer to the nucleus and has a lower energy level than the second energy level. In terms of labeling the areas of positive and negative charge, the nucleus of the atom, which contains the protons and neutrons, has a positive charge due to the presence of the protons. The electrons, which orbit the nucleus, have a negative charge and are distributed in the shells or energy levels surrounding the nucleus.

To learn more about protons here:

https://brainly.com/question/1252435

#SPJ1

Explanation:

Speed is scalar and velocity is vector.

The speed of satellite is fixed as size 100m/s but

the velocity will be changed per second because satellite moves in a circle and its direction changes correspondingly.

the Lewis dot diagram for lithium is

Answer

• Hydrogen bromide: dispersion and dipole-dipole

• Bromine: dispersion

• Hypochlorus acid : dispersion, dipole-dipole, hydrogen bond

• Molecular oxygen: dispersion

Procedure

The London dispersion force is a temporary attractive force that results when the electrons are in two adjacent atoms. These are the weakest intermolecular forces and exist between all types of molecules, whether ionic or covalent—polar or nonpolar.

Dipole-dipole: occur between polar molecules when the partially positively charged part of a molecule interacts with the partially negatively charged part of another molecule.

A hydrogen bond: is a special kind of dipole-dipole interaction that occurs specifically between a hydrogen atom bonded to an oxygen, nitrogen, or fluorine atom.

Based on the previous:

Hydrogen bromide: dispersion and dipole-dipole

Bromine: dispersion

Hypochlorus acid : dispersion, dipole-dipole, hydrogen bond

Oxygen: dispersion

Modern chemical fertilizers include one or more of the three elements that are most important in plant nutrition: nitrogen, phosphorus, and potassium. Of secondary importance are the elements sulfur, magnesium, and calcium.

Answer: The most common useful element in fertilizer is mostly nitrogen since it is also found in air

Answer:

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

Explanation:

This is the answer bc I don't see any answer choices

Answer:

It depends through where the glucose goes through

Explanation:

A camping lamp uses the reaction between calcium carbide (CaC₂) and water to produce acetylene (C₂H₂) gas and calcium hydroxy (Ca(OH)₂), the water are needed to produce 1.55 moles of acetylene gas is 27.9 grams .

The balanced equation for the reaction between calcium carbide and water is CaC₂ + 2H₂O → C₂H₂ + Ca(OH)₂. One mole of CaC₂ produces one mole of C₂H₂ and one mole of Ca(OH)₂. For the production of 1.55 moles of C₂H₂, 1.55 moles of water are required. This is because there is a 1:2 stoichiometric ratio between C2H2 and H2O.

Therefore, we can find the grams of water needed to produce 1.55 moles of acetylene gas by multiplying the number of moles of water by its molar mass. The molar mass of water is 18 g/mol.So, 1.55 mol x 18 g/mol = 27.9 g of water needed to produce 1.55 moles of acetylene gas. Therefore, 27.9 grams of water are needed to produce 1.55 moles of acetylene gas.

Learn more about molar mass at:

https://brainly.com/question/28884993

#SPJ11

Answer: 15 mol

Explanation:

From the equation, we know that for every mole of nitrogen consumed, 3 moles of hydrogen are consumed.

So, the answer is 5(3) = 15 mol

Answer:

rubbing alcohol and bleach creates chloroform which is quite dangerous. Chloroform damages the liver, causing hepatitis, and it can also harm the kidneys, brain, heart, and bone marrow. Respiratory injuries can also come from chloroform exposure, they include respiratory depression, pneumonitis, and pulmonary edema.

To bring the pH of the solution from 9.0 to 10.0, you need to add a specific amount of 5M KOH. The pH of a solution is a measure of its acidity or alkalinity. The pH scale ranges from 0 to 14, with values below 7 being acidic, 7 being neutral, and values above 7 being alkaline or basic.

To calculate the amount of 5M KOH required, we can use the Henderson-Hasselbalch equation, which relates pH, pKa, and the concentrations of the acid and base. In this case, glycine acts as a weak acid with a pKa value of 2.34. We can assume that the glycine will be completely dissociated in the solution. The concentration of glycine is given as 0.1M, which means that [A-] = 0.1M. We can calculate the concentration of [HA], which is the undissociated form of glycine, using the equation [HA] = [A-] * 10^(pKa-pH).

Substituting the values, [HA] = 0.1M * 10^(2.34-9) = 0.000000001M. To reach a pH of 10.0, we need to add enough KOH to react with all the [HA]. The balanced equation for the reaction is: HA + OH- → A- + H2O. The stoichiometry of the reaction shows that 1 mole of HA reacts with 1 mole of OH-. Therefore, the amount of KOH required is equal to the concentration of [HA], which is 0.000000001M. In conclusion, to bring the pH of the solution from 9.0 to 10.0, you need to add 0.000000001M of 5M KOH to 1.0L of 0.1M glycine.

To know more about solution visit:

https://brainly.com/question/15757469

#SPJ11

The lower bound of P is calculated by substituting the maximum value of (m-x) and the known value of a into the given formula. The resulting value is then rounded to the correct number of significant figures, resulting in a lower bound of P = 0.71.

The formula given in the question is P = a/(m-x). To find the lower bound for P, we need to find the maximum value of (m-x), since this denominator would yield the smallest result for P. Given that x = 8 correct to 1 significant figure, the upper bound for x would be 8.5. Then, m = 20 is correct to the nearest 10 so its lower bound would be 15.

Thus, the maximum value of (m-x) would be 15 - 8.5 = 6.5. Now, we substitute a = 4.6 (correct to 2 significant figures) into the formula and we get P = 4.6/6.5 = 0.70769230769.

But because the number with the least significant figures was in the original calculation was 2 (from value of a), we can only have 2 significant figures in our answer. That's why our value for the lower bound of P is 0.71 (rounded to 2 significant figures).

https://brainly.com/question/33741100

#SPJ3

Answer:

Low Tides

Explanation:

Took the test

100%

A) In precipitation reaction when the solution is saturated, the expected concentration of both calcium ions and oxalate ions would be approximately 0.0192 mol/L.

B) After equilibrium is reestablished, the expected concentrations of calcium ions and oxalate ions are approximately 2.498 × 10⁻⁴ mol/L and 0.0192 mol/L, respectively.

To answer the given questions about the precipitation reaction of calcium oxalate, let's break it down into two parts:

A) The concentration of calcium ions and oxalate ions in the saturated solution can be determined when an excess amount of calcium oxalate is added to 100.0 mL of pure water.

Since excess calcium oxalate is added, it means that the solution will contain more calcium oxalate than what can dissolve. At saturation, the solution is in equilibrium with the solid calcium oxalate.

Let's assume the concentration of calcium ions and oxalate ions in the saturated solution is represented by "x" (in mol/L).

The equilibrium expression for the reaction is:

Ks = [Ca²⁺][C₂O₄²⁻]

Given that the equilibrium constant Ks = 3.7 × 10⁻⁴, we can set up the equation:

3.7 × 10⁻⁴ = x * x

Solving for "x," we find:

x = √(3.7 × 10⁻⁴) ≈ 0.0192 mol/L

Therefore, when the solution is saturated, the expected concentration of both calcium ions and oxalate ions would be approximately 0.0192 mol/L.

B) If 1.00 mg of calcium chloride (CaCl2) were added to the mixture, what would be the expected concentrations of calcium ions and oxalate ions once equilibrium is reestablished?

Since calcium chloride (CaCl₂) dissociates completely into calcium ions (Ca²⁺) and chloride ions (Cl⁻) in solution, the addition of 1.00 mg of CaCl₂ will result in the addition of 1.00 mg of calcium ions.

First, we need to convert the mass of calcium ions from mg to mol:

1.00 mg = 0.001 g

0.001 g / (molar mass of Ca²⁺) = 0.001 g / 40.08 g/mol ≈ 2.498 × 10⁻⁵ mol

Since the solution volume is assumed to be unchanged, the concentrations of calcium ions and oxalate ions will change but not the molar amounts.

The concentration of calcium ions is the molar amount (2.498 × 10^(-5) mol) divided by the total solution volume (100.0 mL or 0.100 L):

Concentration of calcium ions = (2.498 × 10⁻⁵ mol) / 0.100 L ≈ 2.498 × 10⁻⁴ mol/L

The concentration of oxalate ions remains the same as in part A since the addition of calcium chloride does not affect the concentration of oxalate ions.

Therefore, after equilibrium is reestablished, the expected concentrations of calcium ions and oxalate ions are approximately 2.498 × 10⁻⁴ mol/L and 0.0192 mol/L, respectively.

Learn more about precipitation reaction at: https://brainly.com/question/13016165

#SPJ11

Molar mass:-

\(\\ \sf\longmapsto LiCN\)

\(\\ \sf\longmapsto 7u+12u+14u\)

\(\\ \sf\longmapsto 21u+12u\)

\(\\ \sf\longmapsto 33u\)

\(\\ \sf\longmapsto 33g/mol\)

No of moles=Given Mass/Molar mass

\(\\ \sf\longmapsto \dfrac{83}{33}\)

\(\\ \sf\longmapsto 2.5mol\)

Answer:

true

Explanation:

Answer:

thunderstorms

Explanation:

The collision of warm, moist air from the ocean with cool, dry air over land is a common weather pattern that can result in the formation of thunderstorms. When the two air masses meet, the warm, moist air rises rapidly and cools, condensing into clouds and eventually producing precipitation, such as rain or hail. The instability created by this collision of air masses also results in strong, gusty winds and lightning, which are characteristic of thunderstorms. Thunderstorms are most likely to occur in the late afternoon and evening, when the sun has had time to warm the land and create temperature differences between the two air masses.

Allen

Sulfur is an element of the periodic table that is not considered a metalloid.

Sulfur is a chemical element of the periodic table that has the following characteristics:

Metalloids are a set of chemical elements of the periodic table that are characterized by having an intermediate behavior between metals and non-metals, in terms of ionization energies and binding properties.

It is not easy to distinguish them from true metals. They conduct electrical current better than non-metals, but they are not good conductors like metals. In addition, they are usually very varied in their shape and coloration.

The list of metalloids includes the following elements:

Learn more about periodic table in: https://brainly.com/question/11155928

Answer:

D. The number of protons.

The atomic weights of elements are generally not integers because they are a weighted average of the isotopic masses of the element's naturally occurring isotopes. Two reasons for the non-integer atomic weights are: natural abundance and isotopic mass.

Isotopes are atoms of the same element that have different numbers of neutrons in their nuclei, leading to different atomic masses. The relative abundance of each isotope contributes to the atomic weight of the element, which can result in non-integer values.

Natural abundance: Naturally occurring elements are typically made up of a mixture of isotopes, and their abundance can vary widely. For example, carbon has two stable isotopes, carbon-12 and carbon-13, with natural abundances of 98.9% and 1.1%, respectively. The average atomic weight of carbon is therefore a weighted average of the isotopic masses of carbon-12 and carbon-13.

Isotopic mass: The isotopic masses of the individual isotopes are not integers themselves, and the relative abundance of each isotope affects the atomic weight, resulting in non-integer values. For example, the isotopic mass of carbon-12 is defined as exactly 12 atomic mass units (amu), but the isotopic mass of carbon-13 is 13.003355 amu, leading to a non-integer average atomic weight for carbon.

Therefore, the atomic weights of elements are generally not integers due to the complex nature of the isotopic mixtures and their isotopic masses.

For more such questions on atomic weights

https://brainly.com/question/17887201

#SPJ11

The value of Kc for this equilibrium mixture is 0.8889.The equilibrium constant, Kc, is a measure of the concentrations of reactants and products in an equilibrium mixture. The balanced equation for the reaction is: N2 + 3H2 ⇌ 2NH3.

Using the given moles, we can calculate the molar concentrations of the reactants and products: [NH3] = 0.400 moles / 2.0 L = 0.200 M [N2] = 0.200 moles / 2.0 L = 0.100 M [H2] = 0.300 moles / 2.0 L = 0.150 M.

Now, we can calculate Kc using the formula: Kc = ([NH3]^2) / ([N2] * [H2]^3). Plugging in the values, we get: Kc = (0.200^2) / (0.100 * 0.150^3) = 0.8889. Therefore, the value of Kc for this equilibrium mixture is 0.8889.

To know more about equilibrium mixture visit:-

https://brainly.com/question/30492004

#SPJ11

Answer:

A

Explanation:

........................

Answer:

push or pull i think..okay?

Answer:  Hydrogen that is not used in balloons because hydrogen burns very easily.

pls mark brainliest

Answer:

30 moles of CO₂

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

Al₂(CO₃)₃ —> Al₂O₃ + 3CO₂

From the balanced equation above,

1 mole of Al₂(CO₃)₃ decomposed to produce 3 moles of CO₂.

Finally, we shall determine the number of mole of CO₂ produced from the decomposition of 10 moles of Al₂(CO₃)₃. This can be obtained as follow:

From the balanced equation above,

1 mole of Al₂(CO₃)₃ decomposed to produce 3 moles of CO₂.

Therefore, 10 moles of Al₂(CO₃)₃ will decompose to produce = 3 × 10 = 30 moles of CO₂.

Thus, 30 moles of CO₂ were obtained from the reaction.

30 moles of CO₂ will be produced by the decomposition of 10 moles of  \(\rm Al_2(CO_3)_3\).

Carbon dioxide is a gas made up of two elements, carbon, and oxygen.

It is the gas that is used by plants to make their food.

The % of this gas on Earth is 0.03%

The balanced equation is

\(\rm Al_2(CO_3)_3 \longrightarrow Al_2O_3 + 3CO_2\)

1 mole of \(\rm Al_2(CO_3)_3\) decomposes to produce 3 moles of CO₂.

If 1 mole of \(\rm Al_2(CO_3)_3\) produce 3 moles of CO₂, then decomposition of 10 moles of \(\rm Al_2(CO_3)_3\) will produce

3 × 10 = 30 moles of CO₂.

Thus, 30 moles of CO₂ will be produced by the decomposition of 10 moles of  \(\rm Al_2(CO_3)_3\).

Learn more about carbon dioxide, here:

https://brainly.com/question/3049557

Answer:4.5 Grams

Explanation:

In 1 mole :- 18gm H2O present as it is it's molar mass

∴ In 0.25 mole=0.25×18

                                             = 4.5gm

Answer: They lose them :)

Explanation:

Answer:

Boyle's law states this.