CHEMISTRY HIGH SCHOOL

3 x 1023 molecules of element Z have a mass of 38 g. What is the mass of 1 mole?

Answers

Answer 1
Answer: 38 g / (3 x 10^23 molecules) * 6,02x10^23 molecules/mol = 76,25 g/mol.
Answer 2
Answer:

Answer:

76.3 g of 1 mole of element Z

Explanation:

According to Avogadro’s number the number of particles in 1 mole of a substance is 6.023 x 10²³.  

The mass of 3 x 10²³ particles is 38g  

Therefore, the mass of 6.023 x 10²³ is ( 38 g  x 6.023 x 10^2^3)/(3 x 10^2^3) = 76.3 g

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Si tomas 100ml de una solución de Nacl 4m y se disuelve en 200ml utilizando el mismo solvente ¿cuál será la nueva concentración?

“Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C.” What topic is the teacher most likely talking about?

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Under which conditions of temperature and pressure does a sample of neon behave most like an ideal gas?(1) 100 K and 0.25 atm
(2) 100 K and 25 atm
(3) 400 K and 0.25 atm
(4) 400 K and 25 atm

Answers

Answer : The correct option is, (3) 400 K and 0.25 atm

Explanation :

The conditions for ideal gas are :

Ideal gas are those gas that has no intermolecular attractions.

Ideal gas are those gas that have negligible volume.

The ideal gas equation is,

PV=nRT

The conditions for real gas are :

Real gas are those gas that have intermolecular attractions.

Real gas are those gas that have volume.

The real gas equation is,

(P+(an^2)/(V^2))(V-nb)=nRT

A real gas behave ideally at high temperature and low pressure condition.

From the given options, option (3) have high temperature and low pressure is the correct option.

Hence, the 400 K and 0.25 atm conditions of temperature and pressure does a sample of neon behave most like an ideal gas.
Since real gases behave least ideally at low temperature and high pressure, they would behave most like an ideal gas at high temperature and low pressure.
 Therefore, (3) 400K and 0.25 atm is the correct answer.
Hope this would help~

The "skin" of the statue of liberty is made of iron. true false

Answers

False. It's copper.

FALSE. IT IS MADE OF COPPER THAT IS WHY IT HAS A GREEN TENT.

Degradates, unlike their parent compounds, are always completely harmless true or false

Answers

The correct answer fro above statement is:

False

Explanation:

Some elements in the atmosphere start the body and are consistent when they are dropped. Others are diminishing. Degradation stocks may be more lethal or less virulent than the first chemical. Other chemicals are deposited momentarily in the organs and are discharged shortly after. After a while, most chemicals and degradation stocks are ordered of as body waste, in the stool, urine, sweat and breathed air.

Answer:

false

Explanation:

Which statement about one atom of an element identifies the element?(1) The atom has 1 proton. (2) The atom has 2 neutrons.(3) The sum of the number of protons and neutrons in the atom is 3.(4) The difference between the number of neutrons and protons in the atom is 1.

Answers

the atom has one proton 

What is true about the dilution of a solution?The amount of solute decreases.
The volume remains the same.
The amount of solvent increases.
The concentration increases.

Answers

The amount of solvent increases, since the solvent is the one diluting the solution, the more you want your solution diluted, the more of solvent you'd use. :)
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