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VladimirAG [237]
3 years ago
7

Which of the following has mechanical energy? (5 points)

Chemistry
2 answers:
kodGreya [7K]3 years ago
8 0

Answer:

compressed spring

Explanation:

Lisa [10]3 years ago
4 0
B compressed spring I’m pretty sure
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% LI = 13.88/73.89*100 = 18.78% perfectly correct.
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Halogens. Ex. fluorine can be the gas,bromine can be the liquid, and iodine could a solid all under room conditions.
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A gas of 3.4 moles occupies a volume of 0.046 L at 298 K. What is the pressure in kPa?
Phantasy [73]

Answer : The correct option is, 2.1\times 10^5kPa

Explanation :

To calculate the pressure of gas we are using ideal gas equation as:

PV=nRT

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R = gas constant = 8.314 L.kPa/mol.K

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P\times (0.046L)=(3.4mol)\times (8.314L.kPa/mol.K)\times (298K)

P=1.83\times 10^5kPa\approx 2.1\times 10^5kPa

Therefore, the pressure of gas is, 2.1\times 10^5kPa

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Which gas will diffusion faster within a system?
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Methane(CH₄).

Explanation:

  • Thomas Graham found that, at a constant  temperature and pressure the rates of effusion  of various gases are inversely proportional to  the square root of their masses.

<em>∨ ∝ 1/√M.</em>

where, ∨ is the rate of diffusion of the gas.

M is the molar mass of the gas.

<em>∨₁/∨₂ = √(M₂/M₁)</em>

<em></em>

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Water vapor : 18.0 g/mol.

Ammonia (NH₃): 17.0 g/mol.

Methane(CH₄): 16.0 g.mol.

<em>Since, methane has the lowest molar mass. So, it will diffuse faster within a system.</em>

3 0
3 years ago
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