CHEMISTRY HIGH SCHOOL

Determine the pressure exerted by 0.352 mol of oxygen gas in a 1.75 L container at room temperature (25 degrees Celsius). Show all your work!

Answers

Answer 1

Answer:

Answer:

P = 4.92 atm

Explanation:

Given data:

Number of mole of oxygen = 0.352 mol

Volume of gas = 1.75 L

Temperature = 25°C

Pressure exerted by gas = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K

T = temperature in kelvin

Now we will convert the temperature.

25+273 = 298 K

P × 1.75 L = 0.352 mol × 0.0821 atm.L/ mol.K ×298 K

P = 8.61 atm.L / 1.75 L

P = 4.92 atm

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The velocity of an object consists of its speed and..A. Average speed
B. Distance
C. Displacement
D. Direction

Answers

Answer:

direction

Explanation:

What is the molality of a solution in which 3.0 moles of NaCl is dissolved in 1.5 Kg of water?

Answers

The molality of the sodium chloride solution is 2.0 mol/kg.

Given:

3.0 moles of NaCl in 1.5 kilograms of water.

To find:

The molality of the solution

Solution:

The moles of solute that is sodium chloride = 3.0 mol

The mass of solvent that is water = 1.5 kg

The molality of the solution:

$=(3.0 mol)/(1.5 kg)=2.0 mol/kg$

The molality of the sodium chloride solution is 2.0 mol/kg.

Learn more about molality here:

brainly.com/question/4580605?referrer=searchResults

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density H2O = 1g/cm³
1,5 kg H2O = 1500g = 1500cm³ (1dm³ = 1000cm³)

3moles of NaCl-----in---------1500cm³ H2O
x moles of NaCl ----in--------1000cm³ H2O
x = 2moles of NaCl

answer: 2 mol/dm³

Identify the following as a compound or a mixture: quartz (SiO2)

Answers

quartz (SiO2) is a compound. A compud is the combination of two or more elements. It is a compound because three elements are formed, the silicon and the two atoms of oxygen.

1. Why do all atoms of an element have the same atomic number, although they may have different mass numbers?2. What do we call atoms of the same element with different mass numbers?

3. Explain the meaning of each term in the symbol
(AZ)X

Answers

Atoms of an element have the same atomic number but different mass numbers because the atomic number only contains the amount of protons in an element.
Atoms of the same element that have different mass numbers are called isotopes.
With (AZ)X, the A is the number of protons, the Z is the number of neutrons, and the X is the electrons.

How does hydrogen ion change into hydrogen atom