What is the pH of a 0.0046 M nitric acid solution

Answer:

The p- nitrophenol is more acidic than phenol because the deactivating nature of nitro group and after loosing the protons it makes more resonance stabilization as nitro group is having strong deactivating nature so it attracts electrons towards it.

Answer:

39.119 g

Explanation:

1 mole of S has 32.065 g

=> 1.22 x 32.065 = 39.1193 or 39.119 g

Answer:

no but oxygen

Explanation:

no but oxygen

Answer:

they release energy by using photosynthesis

Explanation:

By the concept of calculating moles ,it can br concluded that the no. of atoms of phosphorus in 8.80mol of copper(II) phosphate is=1.06\(x10^{25}\)

A mole is defined as amount of substance containing as many as elementary entities that are there in atoms of exactly 12 g of carbon-12.Therefore we can say,1 mole of copper(II) phosphate, Cu3(PO4)2, contains three moles of copper(II) cations and two moles of phosphate anions.

Again 1mole of phosphate anions contains one mole of phosphorus and four moles of oxygen.Considering all these informations we can conclude that:1 mole of copper(II) phosphate contains 2 moles of Phosphorus

Accordingle the sample contains=(8.80\(x\)2) moles of Phosphorus

                                    =(17.6\(x\)Avogadro's constant) atoms of  Phosphorus

                                    =(17.6\(x\)6.022\(x\)\(10^{23}\)) atoms of  Phosphorus

                                    =1.06\(x10^{25}\) [approx] no. of Phosphorus atoms

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In 8.80 moles of copper(II) phosphate, there are approximately 1.06 x 10²⁵ atoms of phosphorus.

The number of atoms of phosphorus in a given amount of a compound can be calculated using the concept of mole in chemistry. Copper(II) phosphate is Cu3(PO4)2, containing 2 moles of phosphorus (P) for every 1 mole of the compound. Avogadro's number (6.022 x 10²³) gives the number of atoms in one mole.

So, if there are 8.80 moles of copper(II) phosphate, there would be 2 × 8.80 moles of phosphorus. Multiplying this by Avogadro's number gives the total number of phosphorus atoms.

Therefore, the number of phosphorus atoms is 2 × 8.80 × 6.022 x 10²³ = 1.06 x 10²⁵ atoms of phosphorus.

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Answer:

only molecules with polar bonds may have a permanent dipole moment.

Explanation:

Answer:

C).Iron

Explanation:

Iron has a binding energy of 8.8MeV

The above model is a good representation of a molecule because it clearly displays the atoms (white and black circles) and the chemical bond sticks that are present in the atom.

A drawback of the above model is that it does not show clearly the various freedom of movement that may be found in molecules nor does it show the movement of electrons.

The model can be improved by designing it to have relative freedom between the bond to indicate the freedom of movement of bonds.

Scientific models are structures that are used to represent or explain scientific concepts.

Scientific models may be pictures, three-dimensional objects, illustrations., etc.

Scientists use different models to represent concepts or ideas. For example, the planetary model of the atom, and the ball and stick model of molecules.

The ball and stick model shows the atoms and the bonds that are present in the compound.

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The given electron configuration 1s² 2s² 2p⁶ 3s² 3p⁴ denotes the elements helium (He), beryllium (Be), carbon (C), magnesium (Mg), and sulfur (S).

The given electron configuration represents the electron distribution of an atom. Let's break it down and determine the elements denoted by each part:

1s²: This indicates that there are two electrons in the 1s orbital. The first electron shell (n = 1) can hold a maximum of two electrons. Therefore, the first element denoted by this configuration is helium (He).

2s²: This signifies that there are two electrons in the 2s orbital. The second electron shell (n = 2) can hold a maximum of eight electrons. The element with this configuration is beryllium (Be).

2p⁶: This indicates that there are six electrons in the 2p orbitals. The p orbitals are a set of three orbitals within the second electron shell. The element with this configuration is carbon (C).

3s²: This signifies that there are two electrons in the 3s orbital. The third electron shell (n = 3) can also hold a maximum of eight electrons. The element with this configuration is magnesium (Mg).

3p⁴: This indicates that there are four electrons in the 3p orbitals. The p orbitals in the third shell are also a set of three orbitals. The element with this configuration is sulfur (S).

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A chemist determines that a substance is composed of 30.4% nitrogen by mass and 69.6% oxygen by mass. The molar mass of the compound is 230.5 g/mol, the molecular formula is NO₂.

We must compute the empirical formula in order to ascertain the compound's chemical composition.

If we have 100 grams of the compound.

This suggests we have:

30.4 g of nitrogen

69.6 g of oxygen

Now, we have to convert the mass of each element to moles.

The molar mass of nitrogen (N) = 14.01 g/mol

the molar mass of oxygen (O)  =  16.00 g/mol.

Number of moles of nitrogen (N):

2.17 mol

Number of moles of oxygen (O):

4.35 mol

The simplest whole-number ratio between the moles of nitrogen and oxygen must now be determined. To calculate the ratio, we divide both numbers by the smaller value.

Moles N / moles O = 2.17 mol / 2.17 mol = 1.00

Moles O / moles O = 4.35 mol / 2.17 mol = 2.00

The ratio is approximately N₁O₂.

We divide the subscripts by their greatest common divisor to obtain the simplest ratio, since we are looking for the empirical formula. The empirical formula is NO₂ since the greatest common divisor in this situation is 1.

The molecular formula of the compound is NO₂.

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The amount of intermolecular forces, the structure of the material, and the temperature all affect how much vapour a pure chemical substance produces.

Intermolecular forces operate between molecules. Intermolecular forces are less powerful than intramolecular forces. Van der Waals forces, ion-dipole communication, dipole-dipole contact, and weaker intermolecular forces are a few examples of intermolecular forces.

Molecules interact with one another to form electrostatic forces, which are interactions of positive and negative charges. Similar to how molecules are kept together by covalent bonds, forces between molecules are made up of both attractive and repelling constituents.

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If the limewater turns milky after adding gas sample, it confirms that the gas produced during reaction between hydrochloric acid and marble is indeed carbon dioxide.

To confirm that the gas produced is carbon dioxide, scientist could perform the following test:

Collect a sample of gas produced during reaction between hydrochloric acid and marble. This can be done by placing container over the reaction mixture and allowing gas to bubble into it.

Add few drops of limewater (aqueous calcium hydroxide) to collected gas sample. If gas is carbon dioxide, it will react with limewater to form milky precipitate of calcium carbonate.

Observe the appearance of limewater after the addition of gas sample. If  limewater turns milky, it indicates the presence of carbon dioxide gas. If  limewater remains clear, then gas produced is not carbon dioxide.

Therefore, if limewater turns milky after adding the gas sample, it confirms that gas produced during reaction between hydrochloric acid and marble is carbon dioxide.

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Answer:

b. 0.27 M ammonia + 0.38 M ammonium nitrate.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to bear to mind the fact that buffest must be prepared by using either of the following pairs:

weak acid/conjugate base

weak base/conjugate acid

So that the pH might be set constant. In such a way, since a. shows two salts, c. a strong acid with a neutral base, d, shows two acids and e. a strong base with a neutral base, we infer the correct buffer is b. 0.27 M ammonia + 0.38 M ammonium nitrate because it has a weak base (ammonia) and its conjugate acid, ammonium.

Regards!

Answer:

Explanation:

making sure the liquid inside the thermometer is at eye level when taking the temperature

making sure the bulb of the thermometer does not touch the bottom of the beaker or the ice when taking the temperature

The pressure, in atmospheres, exerted by a 0.100 mol sample of oxygen in a 2.00 L container at 273 °C is 2.24 × 10⁰ atm.

The pressure of a substance can be calculated using the following formula;

PV = nRT

According to this question, the pressure, in atmospheres, exerted by a 0.100 mol sample of oxygen in a 2.00 L container at 273 °C can be calculated as follows:

P × 2 = 0.1 × 0.0821 × 546

2P = 4.48266

P = 2.24 × 10⁰ atm

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The volume of nitrogen dissolved in blood plasma is 0.4 L.

The maximum volume of nitrogen that can dissolve in the diver's blood plasma is obtained as follows:

Number of moles of nitrogen dissolved at a depth of 93.0 m = Henry's constant * pressure at 93.0 m * volume of plasma

Number of moles of nitrogen =  5.80 × 10⁻⁴ * 10 * (4.95 * 55%)

Number of moles of nitrogen = 0.0158 moles

Hence,;

n = 0.0158 moles

R = 0.08206 L.atm/mol/K

T = 37 + 273 = 310 K

P = 1 atm

V = 0.0158 * 0.08206 * 310/1

V = 0.4 L

In conclusion, the volume of nitrogen dissolved in blood plasma is determined using the number of moles of dissolved nitrogen.

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Answer:B

Explanation: Pennfoster answer

The amount of carbondioxide that will be produced if 1.3L is combusted is 3.9L (option B).

Stoichiometry refers to the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, propane gets combusted in air to produce carbondioxide and water as follows:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Based on the above equation, 1 mole of propane produces 3 moles of carbondioxide.

This suggests that 1.3L of propane will produce 3.9L of carbondioxide.

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Answer:

Cakes, breads and other foods that contain leavening agents rise more quickly at higher altitudes, because gases produced by the agents expand faster than at sea level. The loaves may collapse if the gases dissipate before the proper temperature is reached. Most baking recipes can be adjusted for high altitudes.

Explanation:

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Potassium hydroxide and cupric sulfate react 10 form a precipitate of cupric hydroxide, as well as dissolved potassium sulfate, the reaction is shown below:-

2CuSO4 + 4KI⟶ 2CuI + I2 + 2K2SO4

What is precipitate?

In  aqueous solutions, precipitation is the procedure of remodeling a solute from a supersaturated strategy to an insoluble stable. The stable that bureaucracy is referred to as a precipitate.

Therefore, Potassium hydroxide and cupric sulfate react 10 form a precipitate of cupric hydroxide, as well as dissolved potassium sulfate.

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Answer:Conductors and insulators are both important in the field of electronics. Electrical conductors allow electric current to flow easily because of the make up of their atoms. In a conductor, the outer electrons of the atom are loosely bound and can freely move through the material when an electric charge is applied.

Explanation:hope its help

150 grams of NaOH is approximately equal to 2.256 x 10^24 particles of NaOH.

To convert grams of NaOH to particles of NaOH, we need to use the concept of molar mass and Avogadro's number. The molar mass of NaOH is calculated by adding the atomic masses of sodium (Na), oxygen (O), and hydrogen (H) together. It can be determined as follows:

Na: 22.99 g/mol

O: 16.00 g/mol

H: 1.01 g/mol

Molar mass of NaOH = (22.99 g/mol) + (16.00 g/mol) + (1.01 g/mol) = 40.00 g/mol

Now, we can use the molar mass to convert grams of NaOH to moles. Since 1 mole contains Avogadro's number (approximately 6.022 x 10^23) particles, we can determine the number of particles as follows:

150 g NaOH * (1 mol NaOH / 40.00 g NaOH) * (6.022 x 10^23 particles / 1 mol NaOH) ≈ 2.256 x 10^24 particles

It's important to note that this calculation assumes the substance is pure NaOH and that the molar mass and Avogadro's number are accurate.

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Answer:

Pictures that we receive from space are of the past because it takes time for light to reach Earth.

Explanation:

For example, Mars is so far away that, depending on its position in orbit, a picture from Mars takes between 4 min and 24 min to reach Earth.

Answer: Pictures that we receive from space are of the

past

because it takes time for

light

to reach Earth.

Explanation:

Based on the given reactions, the compounds are as follows:

A: The specific product formed from the reaction between prop-1-yne and either 2HBr or H2O2.

B: The product formed when compound A reacts with 2H2O.

C: The product formed when compound B reacts with K2CO3(aq).

D: The product formed from the heat-induced reaction of compound C.

E: The product formed when compound D reacts with HBr.

Based on the given reactions, let's analyze the compounds involved:

Reaction 1: prop-1-yne + 2HBr/H2O2 = A

The reactant prop-1-yne reacts with either 2HBr or H2O2 to form compound A. The specific product formed will depend on the reaction conditions.

Reaction 2: A + 2H2O = B

Compound A reacts with 2H2O (water) to form compound B.

Reaction 3: B + K2CO3(aq) = C

Compound B reacts with K2CO3(aq) (potassium carbonate dissolved in water) to form compound C.

Reaction 4: C + heat = D

Compound C undergoes a heat-induced reaction to form compound D.

Reaction 5: D + HBr = E

Compound D reacts with HBr (hydrobromic acid) to form compound E.

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Answer:

Mass = 1.85 g

Explanation:

Given data:

Number of formula units = 2.8×10²²

Mass of NaOH = ?

Solution:

1 mole contain 6.022×10²³ formula units

2.8×10²² formula units × 1 mol  /6.022×10²³ formula units

0.46×10⁻¹ mol

0.046 mol

Mass of NaOH:

Mass = number of moles × molar mass

Mass = 0.046 mol × 40 g/mol

Mass = 1.85 g

Answer:

[HI] = 0.704mol

[H2] = 0.048mol

[I2] = 0.148mol

Explanation:

Based on the equilibrium:

H2(g)+I2(g) --> 2HI(g)

The equilibrium constant, K, is defined as:

K = 70 = [HI]² / [H2] [I2]

Where [] could be taken as the moles in equilibrium of each reactant

To know the direction of the equilibrium we need to find Q with the initial moles of each species:

Q = [0.200mol]² / [0.300mol] [0.400mol]

Q = 0.333

As Q < K, the reaction will shift to the right producing more HI. The equilibrium moles are:

[HI] = 0.200mol + 2X

[H2] = 0.300mol - X

[I2] = 0.400mol - X

Replacing in K:

70 = [0.200 + 2X ]² / [0.300 - X] [0.400 - X]

70 = 0.04 + 0.8 X + 4 X² / 0.12 - 0.7 X + X²

8.4 - 49 X + 70 X² = 0.04 + 0.8 X + 4 X²

8.36 - 49.8X + 66X² = 0

Solving for X:

X = 0.252 moles. Right solution

X = 0.502 moles. False solution. Produce negative moles.

Replacing:

[HI] = 0.200mol + 2*0.252 mol

[H2] = 0.300mol - 0.252 mol

[I2] = 0.400mol - 0.252 mol

[HI] = 0.704mol

[H2] = 0.048mol

[I2] = 0.148mol

Answer:

Electrolysis is a process in which an electric current is used to drive a chemical reaction that would not otherwise occur.

When an electric current is passed through the cell, the ions in the electrolyte solution are attracted to the electrodes and undergo a chemical reaction at the surface of the electrodes.

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Answer:

cause the bottom part starts at 0 and the top starts at 12

Explanation:

1.761 moles NO will be made from 30g of NH3.

The balanced reaction is:

4 NH₃(g) + 5 O₂(g) → 4 NO (g) + 6 H₂O

By stoichiometry of the reaction, we have

Recall that

Number of moles = Mass/ Molar Mass

We first Find the number of moles in 30g of NH3 ,

Number of moles=30/17.031 g/mol=1.761moles

Now we can say  if by stoichiometry

IF 4 moles of NH3 produces 4 moles of NO,

then  1.761 moles of aNH3  will produce = ( 1.761 moles NH3 x 4 moles of NO)/ 4 moles of NH3

= 1.761 moles NO

Therefore, 1.761 moles NO will be made from 30g of NH3.

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