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3 years ago

What happens to the motion of molecules in a substance is cooled?

1 answer:

7 0

The motion becomes smaller. Lets tale the example of water. At gaseous state, the particles moves rapidly in all directions. As it is cooled, it becomes liquid and the motion becomes smaller because the particles are now closer to each other as the attraction forces becomes stronger. As it is cooled further, it becomes solid. At solid state, the particles now vibrate in fixed position. Apply this concept to motion of molecules in a substance.

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A quantity of water vapor at 100°C is condensed to liquid water at the same temperature. In the process, 180,414.08 joules of

salantis [7]

Answer:

0.08kg

Explanation:

Given parameters:

Temperature of water = 100°C

Quantity of heat released = 180414.08J

Unknown:

Quantity of water condensed = ?

Solution:

This is simple phase change process without any attendant change in temperature.

To solve this problem, use the formula below;

H = mL

H is the heat released

m is mass

L is the latent heat of condensation of water = 2260 kJ/kg

Insert the parameters and solve;

180,414.08 = m x 22.6 x 10⁵ J/kg

m = $\frac{180414.08}{2260000}$ = 0.08kg

5 0

3 years ago

How to find total pressure of gases

pychu [463]

Answer:

ptotal=pA+pB+pC

Explanation:

it is defined as the sum le the pressures le each individual gas ^

5 0

4 years ago

A crime lab received a 235-gram sample. The sample had a molecular mass of 128.1 grams and the empirical formula is CH2O. How ma

kvv77 [185]

Explanation:

Given parameters:

Mass of sample = 235g

Molecular mass of sample = 128.1g

Empirical formula = CH₂O

Unknown:

Mass of each element in the sample = ?

Solution:

To solve this problem, we must know that the empirical formula of any compound is the simplest ratio of the atoms it contains. This is not the true formula of the compound.

Molecular formula = (Empirical formula)ₙ

Let us find the molecular mass of the sample;

CH₂O = 12 + 2(1) + 16 = 30g

128.1 = (30)n

n = 4

The molecular formula of the compound is; (CH₂O)₄ = C₄H₈O₄

Now to find the grams of each element in the sample;

Express the molecular mass of each element and that of the compound as a fraction and multiply with the given mass;

For C;

$\frac{4 x 12}{128.1} x 235\\$ = 88.06g

H; $\frac{8 x 1}{128.1} x 235$ = 14.68g

O: $\frac{4 x 16}{128.1} x 235$ = 117.41g

learn more:

Mass composition brainly.com/question/3018544

#learnwithBrainly

7 0

3 years ago

Only positive ions have a charge. true or false?

Elis [28]

Answer:

true

Explanation:

5 0

3 years ago

The H 2 produced in a chemical reaction is collected through water in a eudiometer. If the pressure in the eudiometer is 101.3 k

Gnom [1K]

The H2 produced in a chemical reaction is collected through water in a eudiometer. The pressure (kPa) of the H2 gas is 98.89 kPa

The total pressure in a chemical reaction is the total sum of the partial pressure and the vapor pressure of the chemical substances taking place in the chemical reaction.

Total pressure = partial pressure of H₂ gas + vapor pressure of H₂O

∴

The vapor pressure of H₂ gas = Total pressure in the eudiometer - partial pressure of H₂O

Given that:

The total pressure in the eudiometer = 101.3 kPa
The partial pressure of H₂O = 2.41 kPa

The vapor pressure of H₂ gas = 101.3 kPa - 2.41 kPa

The vapor pressure of H₂ gas = (101.3 - 2.41) kPa

The vapor pressure of H₂ = 98.89 kPa

Therefore, we can conclude that the vapor pressure of H₂ is 98.89 kPa.

Learn more about partial pressure here:

brainly.com/question/14281129?referrer=searchResults

3 0

2 years ago