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Answer:

we have a base-Ca(OH)2 and an acid - HNO3

→Their chemical reaction gives us water and salt Ca(NO3)+ H20 (neutralisation reaction)

the pH is expected to be acidic ... since nitric acid is a strong acid and calcium hydroxide is a weak base .

Explanation:

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Answer: 39.9 g HzF is equivalent to 0.0398 L.

Explanation:

According to the standard conversion factor,

1 gram = 0.001 L

Therefore, 39.8 g will be converted into liter as follows.

[tex]1 g = 0.001 L\\39.8 g = 39.8 g \times \frac{0.001 L}{1 g}\\= 0.0398 L[/tex]

Thus, we can conclude that 39.9 g HzF is equivalent to 0.0398 L.

Answer: Molarity of the solution is 0.028 M.

Explanation:

Given : Moles of sucrose (solute) = 0.112 mol

Volume of solution = 4.0 L

Molarity is the number of moles of solute dissolved in a liter of solvent.

[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.112 mol}{4.0 L}\\= 0.028 M[/tex]

Thus, we can conclude that molarity of the solution is 0.028 M.

Answer:

The answer would be D.

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Explanation:

The number of gas molecules changes as the pressure inside oxygen tanks changes as they are filled. option D is correct.

Oxygen tanks are those in which the oxygen is filled in the liquid form by giving pressure to it with the help of a piston due to more pressure the molecules of oxygen become close.

As the molecule of the oxygen gas is closed to each other they are condensed and changes their state from a gaseous state to a liquid state.

By providing more pressure to the oxygen tank the gas molecules increases due to the decrease in the surface of the tank and molecules condense to liquid form.

Therefore, The number of gas molecules changes as the pressure inside oxygen tanks changes as they are filled. option D is correct.

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Answer:

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Answer:

C: No, he should place the He atom and energy on the right, and the H atoms and heat and pressure on the left.

Explanation:

Answer:

The answer is c.1. The atomic number of nitrogen is 7.

The electron arrangement of nitrogen is 2.5. With that said, atom 1 resembles the neutral atom of nitrogen because the innermost shell of the atom contains 2 electrons while the outermost shell of the atom contains 5 electrons.

The model that could represent a neutral atom of nitrogen is the first one. Thus, the correct option is C.

A nitrogen atom may be defined as a chemical element with an atomic number of 7 and an atomic mass of 14.  It contains seven protons in its nucleus.

Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table. Being neutral, the number of protons that it has in its nucleus must be equal to that of the surrounding electron. Hence, the number of electrons are seven.

These seven electrons are only visible in the first model. Thus, the correct option for this question is C.

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The answer is: Element B

Answer: The volume of given ball is 21 L.

Explanation:

Given : Pressure = 1.0 atm,      no. of moles = 0.85 mol

Temperature = [tex]25^{o}C = (25 + 273) K = 298 K[/tex]

According to the ideal gas equation, formula used is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

[tex]PV = nRT\\1.0 atm \times V = 0.85 mol \times 0.0821 Latm/mol K \times 298 K\\V = 21 L[/tex]

Thus, we can conclude that the volume is 21 L.

Answer:

I think b

Explanation:

50 moles of ammonia gas are produced in the following reaction if 25 moles of nitrogen gas reacts with hydrogen. Therefore, the correct option is option C.

In the National System of Units, the mole represents the unit of substance amount. However many elementary units of a particular substance are present inside an object as well as sample is determined by the quantity of that material. There are precisely  6.022×10²³ elementary entities in a mole.

An elementary object may include an atom, any molecule, and ion, an ion pair, or perhaps a subatomic particle like an electron depending upon what the substance is. 

N[tex]_2[/tex](g) + 3H[tex]_2[/tex](g). → 2NH[tex]_3[/tex](g)

moles of nitrogen = 25 moles

the  mole ratio between nitrogen and ammonia is 1:2

moles of nitrogen = 25×2=50 moles

Therefore, the correct option is option C.

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Respuesta:

2.17 × 10⁻³ g/cm³

Explicación:

Paso 1: Información provista

Paso 2: Convertir 64 °C a Kelvin

Usaremos la siguiente fórmula.

K = °C + 273.15 = 64 °C + 273.15 = 337 K

Paso 3: Calcular V₂

Usaremos la ecuación combinada de los gases ideales.

P₁ × V₁ / T₁ = P₂ × V₂ / T₂

V₂ = P₁ × V₁ × T₂ / T₁ × P₂

V₂ = 96.4 kPa × 969 cm³ × 273.15 K / 337 K × 100 kPa = 757 cm³

Paso 4: Calcular la densidad del gas a  TPE

A TPE, 1.64 g del gas ocupan 757 cm³.

ρ = 1.64 g/757 cm³ = 2.17 × 10⁻³ g/cm³

Answer:

1. 9.57 × 10^-9 moles.

2. 7.38mol

Explanation:

1.) To find the number of moles there are in the number of particles in an atom, we divide the number of particles (nA) by Avagadro's constant (6.02 × 10^23)

Hence, to find the number of moles (n) of Manganese (Mn), we say:

5.76 x 10^15 atoms ÷ 6.02 × 10^23

5.76/6.02 × 10^(15-23)

= 0.957 × 10^-8

= 9.57 × 10^-9 moles.

2.) Mole = mass/molar mass

Molar mass of sodium chloride (NaCl) = 23 + 35.5

= 58.5g/mol

mole = 431.6 g ÷ 58.5g/mol

mole = 7.38mol

Answer:

This is an exothermic reaction. An exothermic reaction is a term that describes a chemical reaction in which there is a net release of energy (heat). Magnesium is also capable of reducing water to the highly-flammable hydrogen gas, which will be ignited by the excess heat given by the reduction reaction.

Explanation:

p [OH-] = -log[OH-]= -log ( 1x10^-11M) = 11

we know that

p[OH-] + p[H+] = 14

so p[H+] = 14- p[OH-] = 14- 11 = 3

pH = 3, answer

Answer:

The addition of energy  through the chemical reaction when substance combines and gets decomposed.

Explanation:

Answer:

3 moles of Calcium Oxide are formed

Explanation:

Based on the reaction of Calcium Ca, with oxygen, O₂, to produce calcium oxide, CaO is:

2Ca + O₂ → 2CaO

where 2 moles of calcium produce 2 moles of Calcium oxide.

That means, if 3 moles of Ca react in presence of oxygen:

3 moles of calcium oxide are formed

Answer:

La cantidad de energía disponible de una fuente de energía determinada se denomina recurso energético. La escasez de recursos energéticos (petróleo, carbón y madera) en algunas de las fuentes de energía más utilizadas plantear necesidad de usar otras fuentes investigar el modo más rentable de emplearlas

Explanation:

Answer:

false

Explanation:

its the amount of high-quality energy available from a given quantity of an energy resource minus the high-quality energy needed to make the energy available.

Equal volumes of nitrogen and oxygen, at the same temperature and  pressure, would: b. contain the same number of particles.

Avogadro's law states that, equal volumes of all gas samples have the same number of atoms or molecules at the same temperature and pressure.

In Science, the Avogadro's number is typically used to determine the number of atoms or molecules that are contained in a certain mass of a chemical element.

Note: Avogadro's constant is equal to [tex]6.02 \times 10^{23}[/tex]

In conclusion, equal volumes of nitrogen and oxygen, at the same temperature and  pressure, would contain the same number of particles (atoms or molecules) in accordance with Avogadro's law.

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Answer:

Avogadro's Law

Explanation:

The amount of moles is directly proportional to the volume of the gas under constant temperature and pressure. That is the statement of Avogadro's law. The equation is:

V1n2 = V2n1

Where V is volume and n are moles of 1, initial state and 2, final state of the gas

That means, right option is:

Answer:

C)9.5

Explanation:

Given poH=4.5

find ph

from 14=ph+poh

14=ph+4.5

ph=9.5

Answer:

Yes

Explanation:

Yes heating water allows it to dissolve more Sugars because the molecular distance increases and this distance can be covered by more sugar. In the given question, The independent variable would be the temperature of water.

Answer:

The pressure of the gas at 323 degrees Celsius is 2 atm.

Explanation:

Gay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.

In short, when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases.

Gay-Lussac's law can be expressed mathematically as follows:

[tex]\frac{P}{T} =k[/tex]

Where P = pressure, T = temperature, K = Constant

Having two different states, an initial state 1 and a final state 2, it is satisfied:

[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]

In this case:

Replacing:

[tex]\frac{1 atm}{298 K} =\frac{P2}{596 K}[/tex]

Solving:

[tex]P2=\frac{1 atm}{298 K}*596 K[/tex]

P2= 2 atm

The pressure of the gas at 323 degrees Celsius is 2 atm.

Answer:

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Explanation:

Answer:

option d) is the correct answer

during tbe 1880s and 90s scientist searched cathode rays for the carrier of the electrical properties in matter. the person who discovered Thomson of the electron of 1897.

The answer is option C

Explanation:

Al= 26.982

2 moles of aluminium wad given so

2× 26.982= 53.96 grams