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Ugo [173]
2 years ago
5

A ballon is filled with 30.0g of helium gas. What volume can be filled to a pressure of 1.15 atm if the temperature is 20.0°C?

Chemistry
1 answer:
Nostrana [21]2 years ago
5 0

Answer:

156.7mL

Explanation:

First we need to find the number of mole of He. This can be achieved by doing the following:

Mass of He from the question = 30g

Molar Mass of He = 4g/mol

Number of mole = Mass /Molar Mass

Number of mole of He = 30/4

Number of mole of He = 7.5moles

Now, we can obtain the volume as follows:

P = 1.15 atm

T = 20°C = 20 + 273 = 293K

R = 0.082atm.L/Kmol

n = 7.5moles

V =?

Recall: PV = nRT

V = nRT/P

V = (7.5 x 0.082 x 293)/1.15

V = 156.7mL

Therefore, the volume that can be filled to that pressure is 156.7mL

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5 0
3 years ago
Which formula can be used to calculate the theoretical yield? (5 points)
Semenov [28]

Answer:

Multiply the number of moles in the product by the molecular weight of the product to determine the theoretical yield.

Explanation:

For example:

If you created 0.5 moles of Aluminium Oxide the molecular weight of Aluminium Oxide is 101.96g/mole, so you would get 50.98g as the theoretical yield.

So multiply,..

101.96x0.5= 50.98

This is the correct way to calculate the theoretical yield

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3 years ago
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