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svet-max [94.6K]
2 years ago
11

Please, I need this now.

Chemistry
1 answer:
Mazyrski [523]2 years ago
8 0

Answer:

1. C    2. D    3. B   4. A

Explanation:

Logic

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what is the mole fraction of neon in a mixture that contains 0.628 g of helium, 11.491 g of neon, and 7.613 g of argon?​
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Explanation:

Given parameters:

Mass of helium = 0.628g

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Unknown:

Mole fraction of neon = ?

Solution:

The mole fraction of an element is the number of moles of that element to the total number of moles in the gas mixture.

We need to calculate the number of moles of each element first;

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Molar mass of Neon = 20g/mol

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Number of moles of Ar = \frac{7.613}{40} = 0.19moles

Total number of moles = 0.16moles + 0.58moles + 0.19moles = 0.93moles

Mole fraction Neon = \frac{0.19}{0.93}  = 0.2

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