The SI base unit called the mole represents what?

Answers

Answer 1

Answer:

Answer:

The mole, symbol mol, is the SI unit of amount of substance.

Explanation:

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What are the phase change processes taking place when a substance is in equilibrium between liquid and gas phases? A. Melting and boiling B. Expanding and contracting C. Evaporating and condensing D. Freezing and thawing

Answers

Answer: C. Evaporating and condensing

Explanation: Phase change process id the process in which the phase of one substance is transforming into the another.

These chemical process of transformation can takes place under dynamic equilibrium in which conversion of one phase is in equilibrium with the another one.

In this liquid phase is transforming into the gas phase which is known as Evaporation and gaseous phase is converting back into the liquid phase which is known as Condensation.

C. Evaporating and condensing. When the liquid becomes gas is called evaporation. When gas become liquid it's condensation.

Which of the following compounds, when added to water, is most likely to increase the solubility of HgS?A. KNO3
B. Na2SO4
C. KCl

Answers

Answer:

B. $Na_2SO_4$

Explanation:

Hello,

The solubility of HgS is increased by adding $Na_2SO_4$ due to common ion effect which consists on the effect that the higher solubility of $Na_2SO_4$ has over the HgS as the sulfur-based ions modify the solubility product. In such a way, by adding the sulfate, the equilibrium will be shifted rightwards, therefore the solubility is increased.

Best regards.

C. KCl- That is the answer for sure, but I dont want to explain

You fill a rigid steel cylinder that has a volume of 20.0 L with nitrogen gas to a final pressure of 2.00 *10^4 Kpa at 28c How many kilograms of N2 does the cylinder contain

Answers

The quantity of nitrogen the cylinder contains is 4477.8 g

What is pressure?

Pressure is a force exerted in a perpendicular direction in any item.

By ideal gas law

PV = nRT

$P =(w)/(M) =(RT)/(V)\n$

w = mass

Volume is 20.0 l

Pressure is $2.00 * 10^4 \;Kpa$

The molar mass of nitrogen is 28 g/mol

R is gas constant = 0.0821

Temperature is 28 converted into kelvin that is 301 k

Putting the values

$197.6 =(w)/(28) =(0.0821 * 301 )/(20\;l)\n\nw = 4477.8 g$

Thus, the mass of nitrogen is 4477.8 g.

Learn more about pressure, here:

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Answer : The mass of $N_2$ gas is, 4477.8 g

Solution :

using ideal gas equation,

$PV=nRT\n\nP=(w)/(M)* (RT)/(V)$

where,

n = number of moles of gas

w = mass of gas

P = pressure of the gas = $2* 10^4Kpa=197.6atm$

conversion : $1atm=101.2Kpa$

T = temperature of the gas = $28^oC=273+28=301K$

M = molar mass of $N_2$ gas = 28 g/mole

R = gas constant = 0.0821 Latm/moleK

V = volume of gas = 20 L

Now put all the given values in the above equation, we get the mass of gas.

$197.6atm=(w)/(28g/mole)* (0.0821Latm/moleK* 301K)/(20L)$

$w=4477.8g$

Therefore, the mass of $N_2$ gas is, 4477.8 g

Determine how many moles of O2 are required to react completely with 6.7 moles C6H14.

Answers

I think *extra stress on the word think lol* it's 6.7 moles of O₂.
unless you have the full formula, giving me the amount of moles in C₆H₁₄ and O₂.

hopefully this helps. :/

What is the freezing point of lead

Answers

The freezing point of lead is 621.5 fahrenheit (327.5 celsius). The freezing point is the temperature at which a substance transitions from its liquid to its solid state, typically under normal atmospheric pressure.

The temperature at which a substance changes from its liquid phase to a solid phase, normally under normal atmospheric pressure, is referred to as the freezing point. It is a physical attribute of matter. This transition takes place when the attraction interactions between the substance's molecules outweigh their kinetic energy, leading the molecules to organise themselves in a predictable way and create a solid lattice. The nature of the substance, pressure, and contaminants in the substance are some of the elements that affect the freezing point. Different intermolecular forces of varying types and strengths give different substances different freezing points. Thefreezing pointof lead is 621.5 fahrenheit (327.5 celsius).

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The freezing point of lead is 621.5 fahrenheit (327.5 celsius)

The environment plays a crucial role in an organism's ability to fossilize. Which is the best location for fossilization?A) bottom of a river
B) very dry environments, such as land
C) bottom of a lake covered by sediment
Eliminate
D) an environment exposed to natural elements

Answers

The answer is C. The process of fossilization is dependent on the environment. It plays an essential role for the process to occur. The best location possible would be in a bottom of a lake where the organism is buried and is covered with a lot of sediment.

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