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Juli2301 [7.4K]
3 years ago
12

Select the correct answer.

Chemistry
1 answer:
erastova [34]3 years ago
3 0

Scientific law

Explanation:

A scientific law is a term that refers to a fact that naturally occurs in the universe.

Scientific laws are natural laws and they hold true.

  • Scientific law is a well tested idea that holds through for a range of natural events.
  • Scientific theories are explanations of phenomenons drawn from series of tests.

Learn more:

experiment brainly.com/question/5096428

#learnwithBrainly

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Atomic mass: 58.9332
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Hope this helps!

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1234567891011121314151617181920

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Which of the following is not a physical change?
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Calculate the number of moles of a gas that is present in a 7.55 L container at 45°C, if the gas exerts a pressure of 725mm Hg.
vovikov84 [41]

<u>Answer:</u> The number of moles of gas present is 0.276 moles

<u>Explanation:</u>

To calculate the number of moles of gas, we use the equation given by ideal gas:

PV = nRT

where,

P = Pressure of the gas = 725 mm Hg

V = Volume of the gas = 7.55 L

n = number of moles of gas = ?

R = Gas constant = 62.3637\text{ L.mmHg }mol^{-1}K^{-1}

T = Temperature of the gas = 45^oC=(45+273)K=318K

Putting values in above equation, we get:

725mmHg\times 7.55L=n\times 62.3637\text{ L.mmHg }mol^{-1}K^{-1}\times 318K\\\\n=0.276mol

Hence, the number of moles of gas present is 0.276 moles

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