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tigry1 [53]
3 years ago
5

Use the drop-down menus to complete the statements

Chemistry
1 answer:
Kipish [7]3 years ago
3 0

Answer:

First one: group

Second one: period

Third one: number of valence electrons

Last one: increases

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What is the pressure in a 245 L tank that contains 5.21 kg of helium at 27 Celsius ​
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<h2><u>Answer:</u></h2>

(These are not rounded to the correct decimal)

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<h2><u>Explanation:</u></h2>

<u></u>

PV = nRT

V = 245L

P = ?

R = 0.08206 (atm) , 8.314 (kPa) , 62.4 (mmHg)

T = 273.15 + 27 = 300.15K

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How I found (n).

5.21kg x 1000g/1kg x 1 mole/4.0g = 1302.5 moles

Now, plug all the numbers into the equation.

Pressure in atm = (1302.5)(0.08206)(300.15) / 245 = 130.94 atm (not rounded to the correct decimal)

Pressure in kPa = (1302.5)(8.314)(300.15) / 245 = 13,266.6 kPa (not rounded to the correct decimal)

Pressure in mmHg = (1302.5)(62.4)(300.15) / 245 = 99,571.4 mmHg (not rounded to the correct decimal)

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