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gayaneshka [121]
4 years ago
14

A student needs to determine the volume occupied by a gas in a 125 mL flask using the experimental setup described in the proced

ure. The student measures the volume of the flask to be 159 mL to the top of the flask. The student measures the volume of the flask with a stopper in it to be 142 mL. The student performs the experiment by reacting the strip of magnesium with 5 mL of HCl solution. What is the volume of the flask occupied by the hydrogen gas?
Chemistry
1 answer:
Yuki888 [10]4 years ago
6 0

Answer:

It would appear that the H2 gas is collected in a stoppered flask. Therefore, the volume of the gas is 138 mL minus the 5 mL occupied by the HCl, or 133 mL.

Explanation:

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3 years ago
Determine the oxidation number of sodium in Na202
Olegator [25]

Answer:

+1

Explanation:

Na₂O₂

NOTE: the oxidation number of oxygen is always –2 except in peroxides where it is –1.

Thus, we can obtain the oxidation number of sodium (Na) in Na₂O₂ as illustrated below:

Na₂O₂ = 0 (oxidation number of ground state compound is zero)

2Na + 2O = 0

O = –1

2Na + 2(–1) = 0

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Collect like terms

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Divide both side by 2

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5 0
3 years ago
Use condensed electron configurations and Lewis electron-dot symbols to depict the ions formed from each of the following atoms,
Dennis_Churaev [7]

The formula for Cs and S is Cs₂S.

For Cs and S,

Ions formed will be Cs⁺ and S²⁻

As cesium belongs to group 1A and sulfur belongs to group 6A. Therefore, the condensed electronic configuration is -

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Cs have 1 valence electron and S have 6 valence electrons.

Hence to attain a stable electronic configuration, both two Cs atoms lose one electron and form Cs⁺ and these two electrons will be accepted by one S atom to form S²⁻.

Therefore the formula for the compound is Cs₂S as Cs donate 1 electron and S will accept 2 electrons from Cs.

The formula is Cs₂S.

To learn more about electronic configuration, visit: brainly.com/question/15051483

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2 years ago
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olganol [36]

Answer:

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Explanation:

I found this answer by taking notes in class

8 0
3 years ago
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